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Bruce Lindsey (Former Employee)

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Filter Total Items: 13
USGS employees conduct water quality sampling with DH-81: USGS gage 02335870 Sope Creek near Marietta, GA.

USGS National Water Quality Network

Understanding the quality of U.S. streams, rivers, and groundwater requires consistent data collection and analysis over decades for proper context of current conditions. The USGS collects nationally standardized data and information as part of the National Water Quality Network (NWQN). The NQWN is made up of sites across the Nation where USGS scientists regularly measure water-quality conditions.
By
Water Resources Mission Area, New Jersey Water Science Center
USGS National Water Quality Network

USGS National Water Quality Network

Understanding the quality of U.S. streams, rivers, and groundwater requires consistent data collection and analysis over decades for proper context of current conditions. The USGS collects nationally standardized data and information as part of the National Water Quality Network (NWQN). The NQWN is made up of sites across the Nation where USGS scientists regularly measure water-quality conditions.
Learn More
A diagram showing the fate and transport of PFAS

A National Predictive Model for PFAS Occurrence in Groundwater

In October of 2024, USGS Scientist’s published a study where they created a model to predict PFAS occurrence in groundwater at the depths of drinking water supplies. This model can help guide our partners to sample areas where PFAS in drinking water could be an issue for the public.
By
Ecosystems Mission Area, Water Resources Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, California Water Science Center, Eastern Ecological Science Center, Lower Mississippi-Gulf Water Science Center, New England Water Science Center, New Jersey Water Science Center, New Mexico Water Science Center, New York Water Science Center, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC), Western Ecological Research Center (WERC)
A National Predictive Model for PFAS Occurrence in Groundwater

A National Predictive Model for PFAS Occurrence in Groundwater

In October of 2024, USGS Scientist’s published a study where they created a model to predict PFAS occurrence in groundwater at the depths of drinking water supplies. This model can help guide our partners to sample areas where PFAS in drinking water could be an issue for the public.
Learn More
A machine sprays pesticides on row crops

Pesticides in Pennsylvania Groundwaters

USGS annually samples domestic groundwater wells to characterize pesticides, nutrients, and radon in agricultural areas, in cooperation with the Pennsylvania Department of Agriculture. Beginning in 2021, samples for major ions, trace elements, bacteria, and isotopes will also be collected. A subset of wells will be sampled for per- and polyfluoroalkyl substances (PFAS), emerging industrial...
By
Pennsylvania Water Science Center
Pesticides in Pennsylvania Groundwaters

Pesticides in Pennsylvania Groundwaters

USGS annually samples domestic groundwater wells to characterize pesticides, nutrients, and radon in agricultural areas, in cooperation with the Pennsylvania Department of Agriculture. Beginning in 2021, samples for major ions, trace elements, bacteria, and isotopes will also be collected. A subset of wells will be sampled for per- and polyfluoroalkyl substances (PFAS), emerging industrial...
Learn More
A rainbow arc over a large-volume public-supply well

Groundwater Quality Research

Every day, millions of gallons of groundwater are pumped to supply drinking water for about 140 million people, almost one-half of the Nation’s population. Learn about the quality and availability of groundwater for drinking, where and why groundwater quality is degraded, and where groundwater quality is changing.
By
Water Resources Mission Area, National Water Quality Program, Colorado Water Science Center, Dakota Water Science Center, Wyoming-Montana Water Science Center
Groundwater Quality Research

Groundwater Quality Research

Every day, millions of gallons of groundwater are pumped to supply drinking water for about 140 million people, almost one-half of the Nation’s population. Learn about the quality and availability of groundwater for drinking, where and why groundwater quality is degraded, and where groundwater quality is changing.
Learn More
Salt-encrusted soils in the Colorado River Basin

Chloride, Salinity, and Dissolved Solids

All natural waters contain some dissolved solids (salinity) from contact with soils, rocks, and other natural materials. Too much, though, and dissolved solids can impair water use. Unpleasant taste, high water-treatment costs, mineral accumulation in plumbing, staining, corrosion, and restricted use for irrigation are among the problems associated with elevated concentrations of dissolved solids.
By
Water Resources Mission Area, National Water Quality Program
Chloride, Salinity, and Dissolved Solids

Chloride, Salinity, and Dissolved Solids

All natural waters contain some dissolved solids (salinity) from contact with soils, rocks, and other natural materials. Too much, though, and dissolved solids can impair water use. Unpleasant taste, high water-treatment costs, mineral accumulation in plumbing, staining, corrosion, and restricted use for irrigation are among the problems associated with elevated concentrations of dissolved solids.
Learn More
Large-volume public supply well

Public Supply Wells

Are you among the more than 100 million people in the U.S. who relies on a public-supply well for your drinking water? Although the quality of finished drinking water from public water systems is regulated by the EPA, long-term protection and management of the raw groundwater tapped by public-supply wells requires an understanding of the occurrence of contaminants in this invisible, vital resource...
By
Water Resources Mission Area, National Water Quality Program
Public Supply Wells

Public Supply Wells

Are you among the more than 100 million people in the U.S. who relies on a public-supply well for your drinking water? Although the quality of finished drinking water from public water systems is regulated by the EPA, long-term protection and management of the raw groundwater tapped by public-supply wells requires an understanding of the occurrence of contaminants in this invisible, vital resource...
Learn More
Pesticides in groundwater can eventually contaminate well water.

Groundwater Quality in Principal Aquifers of the Nation, 1991–2010

What’s in your groundwater? Learn about groundwater quality in the Principal Aquifers of nine regions across the United States in informative circulars filled with figures, photos, and water-quality information.
By
Water Resources Mission Area
Groundwater Quality in Principal Aquifers of the Nation, 1991–2010

Groundwater Quality in Principal Aquifers of the Nation, 1991–2010

What’s in your groundwater? Learn about groundwater quality in the Principal Aquifers of nine regions across the United States in informative circulars filled with figures, photos, and water-quality information.
Learn More
The Upper Floridan aquifer is close to land surface and in some areas is in direct contact with streams in the lower ACF Basin.

Groundwater Quality—Current Conditions and Changes Through Time

Is groundwater the source of your drinking water? The USGS is assessing the quality of groundwater used for public supply using newly collected data along with existing water-quality data. Learn more about this invisible, vital resource so many of us depend on.
By
Water Resources Mission Area, National Water Quality Program
Groundwater Quality—Current Conditions and Changes Through Time

Groundwater Quality—Current Conditions and Changes Through Time

Is groundwater the source of your drinking water? The USGS is assessing the quality of groundwater used for public supply using newly collected data along with existing water-quality data. Learn more about this invisible, vital resource so many of us depend on.
Learn More
Gas Station

Volatile Organic Compounds (VOCs)

Volatile organic compounds (VOCs) are chemicals that both vaporize into air and dissolve in water. VOCs are pervasive in daily life, because they’re used in industry, agriculture, transportation, and day-to-day activities around the home. Once released into groundwater, many VOCs are persistent and can migrate to drinking-water supply wells.
By
Water Resources Mission Area, National Water Quality Program
Volatile Organic Compounds (VOCs)

Volatile Organic Compounds (VOCs)

Volatile organic compounds (VOCs) are chemicals that both vaporize into air and dissolve in water. VOCs are pervasive in daily life, because they’re used in industry, agriculture, transportation, and day-to-day activities around the home. Once released into groundwater, many VOCs are persistent and can migrate to drinking-water supply wells.
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Screenshot from Decadal Change in Groundwater Quality application

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, National Water Quality Program, Toxic Substances Hydrology
USGS Online Mapper Provides a Decadal Look at Groundwater Quality

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
Learn More
Screenshot from Decadal Change in Groundwater Quality application

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, National Water Quality Program, Toxic Substances Hydrology
USGS Online Mapper Provides a Decadal Look at Groundwater Quality

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
Learn More
Screenshot from Decadal Change in Groundwater Quality application

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, National Water Quality Program, Toxic Substances Hydrology
USGS Online Mapper Provides a Decadal Look at Groundwater Quality

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
Learn More
Filter Total Items: 17

Water Quality Data for Multidecadal Change in Pesticide Concentrations Relative to Human Health Benchmarks in the Nation’s Groundwater Water Quality Data for Multidecadal Change in Pesticide Concentrations Relative to Human Health Benchmarks in the Nation’s Groundwater

In the United States, the widespread use of pesticides has led to contamination of groundwater resources. Three decades ago, the U.S. Geological Survey (USGS) established a national water quality monitoring network for groundwater (NWQN-GW). This network provides an overview of groundwater conditions across a wide range of hydrogeologic settings and capture the impacts of pesticide use...
By
Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2024 Data from Decadal Change in Groundwater Quality Web Site, 1988-2024

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Nitrate and Chloride Data for evaluating Decadal Changes in Groundwater Nitrate and Chloride Data for evaluating Decadal Changes in Groundwater

The U.S. Geological Survey’s National Water Quality Network (NWQN) is the primary source of data to monitor trends in contaminants in groundwater in the United States. However, other data sources are available to evaluate trends. The Water Quality Portal (WQP) and the National Groundwater Monitoring Network (NGWMN) portal provide data that can be used for groundwater quality trends in...
By
Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2022 Data from Decadal Change in Groundwater Quality Web Site, 1988-2022

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2021 Data from Decadal Change in Groundwater Quality Web Site, 1988-2021

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 4.0, April 2025) Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 4.0, April 2025)

Groundwater samples were collected and analyzed from 1,015 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program and the water-quality data and quality-control data are included in this data release. The samples were collected from three types of well networks: principal aquifer study networks, which are used to assess...
By
Water Resources Mission Area

Data for volatile organic compounds in groundwater used for public supply across the United States, 2013-19, and data for associated quality-control samples Data for volatile organic compounds in groundwater used for public supply across the United States, 2013-19, and data for associated quality-control samples

This data release includes tables and time-series plots of results for volatile organic compounds (VOCs) analyzed in samples of groundwater used for public supply that were collected by the USGS National Water-Quality Assessment (NAWQA) Project and the California State Water Resources Control Board’s Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP)...
By
Water Resources Mission Area

Geochemical and Geospatial Data for Per- and Polyfluoroalkyl Substances (PFAS) in Groundwater Used As a Source of Drinking Water in the Eastern United States Geochemical and Geospatial Data for Per- and Polyfluoroalkyl Substances (PFAS) in Groundwater Used As a Source of Drinking Water in the Eastern United States

Concentrations of inorganic constituents, dissolved organic carbon (DOC), tritium, per- and polyfluoroalkyl substances (PFAS), volatile organic compounds (VOCs), and pharmaceuticals were measured in groundwater samples collected from 254 wells in 2019 and 2020. Concentrations of inorganic constituents, DOC, VOCs, and pharmaceuticals were measured at the U.S. Geological Survey (USGS)...
By
Water Resources Mission Area, Environmental Health Program

Data from Decadal Change in Groundwater Quality Web Site, 1988-2020 Data from Decadal Change in Groundwater Quality Web Site, 1988-2020

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Inorganic Constituent and Ancillary Data for Evaluation of Lithium in Groundwater in the United States, 1991-2018 Inorganic Constituent and Ancillary Data for Evaluation of Lithium in Groundwater in the United States, 1991-2018

Lithium concentrations in untreated groundwater from 1,464 public-supply wells, 1,676 domestic-supply wells, and 1,560 monitoring wells distributed across 33 principal aquifers in the United States were evaluated for spatial variations and possible explanatory factors. For context, lithium concentrations are compared to a drinking-water only threshold (60 mg/L) and a Health-Based...
By
Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2018 Data from Decadal Change in Groundwater Quality Web Site, 1988-2018

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Data for Time Scales of Arsenic Variability and the Role of High-Frequency Monitoring at Three Water-Supply Wells in New Hampshire, USA Data for Time Scales of Arsenic Variability and the Role of High-Frequency Monitoring at Three Water-Supply Wells in New Hampshire, USA

This data release consists of data (in four tables) for assessing the time scales of arsenic variability in three production wells in New Hampshire; tables that describe the data fields in the data tables are also included in the data release. High-frequency (every 5 to 15 minutes) and bi-monthly water-quality monitoring of a bedrock-aquifer domestic well (425651070573701), a bedrock...
By
New England Water Science Center
Plot of Radium concentration vs. road salt application rate
Plot of decadal change in Radium concentration vs. road salt application rate
Plot of decadal change in Radium concentration vs. road salt application rate
Plot of Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Graph of decadal change in Radium concentration compared to road salt application rate (Lindsay and others, 2021). Increases in concentrations of radium are correlated with road-salt application, and multiple lines of evidence support that the relation is causal. 

By
Water Resources, National Water Quality Program, National Water Quality Laboratory
Plot of Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Graph of decadal change in Radium concentration compared to road salt application rate (Lindsay and others, 2021). Increases in concentrations of radium are correlated with road-salt application, and multiple lines of evidence support that the relation is causal. 

By
Water Resources, National Water Quality Program, National Water Quality Laboratory
Filter Total Items: 59

Multidecadal change in pesticide concentrations relative to human health benchmarks in the Nation’s groundwater Multidecadal change in pesticide concentrations relative to human health benchmarks in the Nation’s groundwater

Groundwater-quality trend assessments identify aquifers that are responding to changes in pesticide use and the compounds that may pose a threat to water availability. The U.S. Geological Survey has been monitoring pesticide concentrations in groundwater for 25 principal aquifers across the conterminous United States since 1993. The groundwater well locations represent a range of soils...
Authors
Sarah M. Stackpoole, Bruce D. Lindsey, Cee S. Nell
By
Water Resources Mission Area

PFAS sampling activities in the U.S. Geological Survey national networks PFAS sampling activities in the U.S. Geological Survey national networks

Per- and polyfluoroalkyl substances (PFAS), frequently called “forever chemicals,” are used for a wide variety of industrial purposes and are often found in common household and industrial items such as firefighting foams, non-stick cookware, and water-resistant materials. The contamination of water, air, and soil by PFAS is a national and global issue due to their widespread occurrence...
Authors
Melissa L. Riskin, Bruce D. Lindsey, Ryan Conner McCammon
By
Water Resources Mission Area

The U.S. Geological Survey National Water Quality Network—Groundwater, 2024 The U.S. Geological Survey National Water Quality Network—Groundwater, 2024

The U.S. Geological Survey (USGS) operates a National Water Quality Network (NWQN) to monitor trends in groundwater quality and assess emerging contaminants of concern. It is a “network of networks” with 81 subnetworks being sampled on a decadal time scale. Each year, 8 of the subnetworks are sampled. Subnetworks have 20–30 wells each and include studies of domestic supply wells or...
Authors
Bruce D. Lindsey, James A. Kingsbury, Leah Marissa Santangelo
By
Water Resources Mission Area

The U.S. Geological Survey National Water Quality Network—Groundwater—2023 The U.S. Geological Survey National Water Quality Network—Groundwater—2023

The U.S. Geological Survey (USGS) operates a National Water Quality Network (NWQN) to monitor trends in groundwater quality and assess emerging contaminants of concern. It is a “network of networks” with 81 subnetworks being sampled on a decadal time scale. Each year, eight of the subnetworks are sampled. Subnetworks have 20–30 wells each and include studies of domestic supply wells or...
Authors
Bruce D. Lindsey, James A. Kingsbury
By
Water Resources Mission Area

Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States

Per- and polyfluoroalkyl substances (PFAS), known colloquially as “forever chemicals”, have been associated with adverse human health effects and have contaminated drinking water supplies across the United States owing to their long-term and widespread use. People in the United States may unknowingly be drinking water that contains PFAS because of a lack of systematic analysis...
Authors
Andrea K. Tokranov, Katherine Marie Ransom, Laura M. Bexfield, Bruce D. Lindsey, Elise Watson, Danielle Dupuy, Paul Stackelberg, Miranda S. Fram, Stefan Voss, James A. Kingsbury, Bryant Jurgens, Kelly Smalling, Paul M. Bradley
By
Water Resources Mission Area, National Water Quality Program, California Water Science Center, New England Water Science Center, New Jersey Water Science Center, New Mexico Water Science Center, South Atlantic Water Science Center (SAWSC), Lower Mississippi-Gulf Water Science Center

State of science, gap analysis, and prioritization for southeastern United States water-quality impacts from coastal storms—Fiscal year 2023 program report to the Water Resources Mission Area from the Water Availability Impacts of Extreme Events Program—H State of science, gap analysis, and prioritization for southeastern United States water-quality impacts from coastal storms—Fiscal year 2023 program report to the Water Resources Mission Area from the Water Availability Impacts of Extreme Events Program—H

Tropical cyclones (coastal storm events that include tropical depressions, tropical storms, and hurricanes) cause landscape-scale disturbances that can lead to impaired water quality and thus reduce water availability for use. Stakeholders and scientists at local and national scales have illustrated a need for understanding these risks to water quality. A regional and comprehensive...
Authors
Lisamarie Windham-Myers, Tara L. Root, Matthew D. Petkewich, MaryLynn Musgrove, Amy C. Gill, J. Curtis Weaver, Christopher H. Conaway, Bruce D. Lindsey, Francis Parchaso, Noah Knowles, Elizabeth J. Tomaszewski
By
Water Resources Mission Area, Caribbean-Florida Water Science Center (CFWSC), South Atlantic Water Science Center (SAWSC), Oklahoma-Texas Water Science Center, Lower Mississippi-Gulf Water Science Center

Thirty years of regional groundwater-quality trend studies in the United States: Major findings and lessons learned Thirty years of regional groundwater-quality trend studies in the United States: Major findings and lessons learned

Changes in groundwater quality have been evaluated for more than 2,200 wells in 25 Principal Aquifers in the United States based on repeated decadal sampling (once every 10 years) from 1988 to 2021. The purpose of this study is to identify contaminants with changing concentrations, the locations and magnitude of those changes, the factors driving those changes, the obstacles to...
Authors
Bruce D. Lindsey, Brandon J. Fleming, Phillip J. Goodling, Amanda Nicole May
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, New York Water Science Center, Pennsylvania Water Science Center

Integrated water resources trend assessments: State of the science, challenges, and opportunities for advancement Integrated water resources trend assessments: State of the science, challenges, and opportunities for advancement

Water is vital to human life and healthy ecosystems. Here we outline the current state of national-scale water resources trend assessments, identify key gaps, and suggest advancements to better address critical issues related to changes in water resources that may threaten human development or the environment. Questions like, “Do we have less suitable drinking water now than we had 20...
Authors
Sarah M. Stackpoole, Gretchen P. Oelsner, Edward G. Stets, Jory Seth Hecht, Zachary Johnson, Anthony J. Tesoriero, Michelle A. Walvoord, Jeffrey G. Chanat, Krista A. Dunne, Phillip J. Goodling, Bruce D. Lindsey, Michael Meador, Sarah Spaulding
By
Water Resources Mission Area

Quality of groundwater used for public supply in the continental United States: A comprehensive assessment Quality of groundwater used for public supply in the continental United States: A comprehensive assessment

The presence of contaminants in a source water can constrain its suitability for drinking. The quality of groundwater used for public supply was assessed in 25 principal aquifers (PAs) that account for 84% of groundwater pumped for public supply in the U.S. (89.6 million people on a proportional basis). Each PA was sampled across its lateral extent using an equal-area grid, typically...
Authors
Kenneth Belitz, Miranda S. Fram, Bruce D. Lindsey, Paul Stackelberg, Laura M. Bexfield, Tyler D. Johnson, Bryant Jurgens, James A. Kingsbury, Peter B. McMahon, Neil M. Dubrovsky
By
Water Resources Mission Area, California Water Science Center, Colorado Water Science Center, New Mexico Water Science Center

Global groundwater solute composition and concentrations Global groundwater solute composition and concentrations

Informed analysis of policies related to food security, global climate change, wetland ecology, environmental nutrient flux, element cycling, groundwater weathering, continental denudation, human health, etc. depends to a large extent on quantitative estimates of solute mass fluxes into and out of all global element pools including the enigmatic global aquifer systems. Herein for the...
Authors
Warren W. Wood, Pauline L. Smedley, Bruce D. Lindsey, Warren T. Wood, Roberto E. Kirchheim, John A. Cherry
By
Water Resources Mission Area

Volatile organic compounds in groundwater used for public supply across the United States: Occurrence, explanatory factors, and human-health context Volatile organic compounds in groundwater used for public supply across the United States: Occurrence, explanatory factors, and human-health context

This systematic assessment of occurrence for 85 volatile organic compounds (VOCs) in raw (untreated) groundwater used for public supply across the United States (U.S.), which includes 43 compounds not previously monitored by national studies, relates VOC occurrence to explanatory factors and assesses VOC detections in a human-health context. Samples were collected in 2013 through 2019...
Authors
Laura M. Bexfield, Kenneth Belitz, Miranda S. Fram, Bruce D. Lindsey
By
Water Resources Mission Area, California Water Science Center, New Mexico Water Science Center

Perfluoroalkyl and polyfluoroalkyl substances in groundwater used as a source of drinking water in the eastern United States Perfluoroalkyl and polyfluoroalkyl substances in groundwater used as a source of drinking water in the eastern United States

In 2019, 254 samples were collected from five aquifer systems to evaluate per- and polyfluoroalkyl substance (PFAS) occurrence in groundwater used as a source of drinking water in the eastern United States. The samples were analyzed for 24 PFAS, major ions, nutrients, trace elements, dissolved organic carbon (DOC), volatile organic compounds (VOCs), pharmaceuticals, and tritium. Fourteen...
Authors
Peter B. McMahon, Andrea K. Tokranov, Laura M. Bexfield, Bruce D. Lindsey, Tyler D. Johnson, Melissa A. Lombard, Elise Watson
By
Water Resources Mission Area, Environmental Health Program, California Water Science Center, Colorado Water Science Center, New England Water Science Center, New Mexico Water Science Center, Pennsylvania Water Science Center
Three decades of groundwater-quality data across the nation

Three decades of groundwater-quality data across the nation

National report summarizes 30 years of groundwater-quality data, including analysis of contaminants.

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Lithium in U.S. Groundwater

Lithium in U.S. Groundwater

A new USGS study reports that about 45% of public-supply wells and about 37% of U.S. domestic supply wells have concentrations of lithium that could...

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Groundwater age-dating simplified

Groundwater age-dating simplified

A new USGS report documents a simple method to classify groundwater age as premodern (recharged before 1953), modern (recharge in 1953 or later), or a...

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Groundwater Quality in the Midwest: The Cambrian-Ordovician Aquifer System

Groundwater Quality in the Midwest: The Cambrian-Ordovician Aquifer System

A regional assessment of untreated groundwater in the Cambrian-Ordovician aquifer system, which includes parts of Minnesota, Wisconsin, Michigan, Iowa...

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Groundwater Quality in the Southwest: The Rio Grande Aquifer System

Groundwater Quality in the Southwest: The Rio Grande Aquifer System

A regional assessment of untreated groundwater in the Rio Grande aquifer system, which includes parts of Colorado, New Mexico and Texas, is now...

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Groundwater Quality in Eastern U.S.

Groundwater Quality in Eastern U.S.

A regional assessment of untreated groundwater in the combined Valley and Ridge and Piedmont and Blue Ridge aquifers in the eastern United States is...

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Groundwater Quality in the Northern Atlantic Coastal Plain Aquifer System

Groundwater Quality in the Northern Atlantic Coastal Plain Aquifer System

A regional assessment of untreated groundwater in the Northern Atlantic Coastal Plain aquifer system in the eastern United States is now available...

Read Article

Science and Products

Filter Total Items: 13
USGS employees conduct water quality sampling with DH-81: USGS gage 02335870 Sope Creek near Marietta, GA.

USGS National Water Quality Network

Understanding the quality of U.S. streams, rivers, and groundwater requires consistent data collection and analysis over decades for proper context of current conditions. The USGS collects nationally standardized data and information as part of the National Water Quality Network (NWQN). The NQWN is made up of sites across the Nation where USGS scientists regularly measure water-quality conditions.
By
Water Resources Mission Area, New Jersey Water Science Center
USGS National Water Quality Network

USGS National Water Quality Network

Understanding the quality of U.S. streams, rivers, and groundwater requires consistent data collection and analysis over decades for proper context of current conditions. The USGS collects nationally standardized data and information as part of the National Water Quality Network (NWQN). The NQWN is made up of sites across the Nation where USGS scientists regularly measure water-quality conditions.
Learn More
A diagram showing the fate and transport of PFAS

A National Predictive Model for PFAS Occurrence in Groundwater

In October of 2024, USGS Scientist’s published a study where they created a model to predict PFAS occurrence in groundwater at the depths of drinking water supplies. This model can help guide our partners to sample areas where PFAS in drinking water could be an issue for the public.
By
Ecosystems Mission Area, Water Resources Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, California Water Science Center, Eastern Ecological Science Center, Lower Mississippi-Gulf Water Science Center, New England Water Science Center, New Jersey Water Science Center, New Mexico Water Science Center, New York Water Science Center, Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC), Western Ecological Research Center (WERC)
A National Predictive Model for PFAS Occurrence in Groundwater

A National Predictive Model for PFAS Occurrence in Groundwater

In October of 2024, USGS Scientist’s published a study where they created a model to predict PFAS occurrence in groundwater at the depths of drinking water supplies. This model can help guide our partners to sample areas where PFAS in drinking water could be an issue for the public.
Learn More
A machine sprays pesticides on row crops

Pesticides in Pennsylvania Groundwaters

USGS annually samples domestic groundwater wells to characterize pesticides, nutrients, and radon in agricultural areas, in cooperation with the Pennsylvania Department of Agriculture. Beginning in 2021, samples for major ions, trace elements, bacteria, and isotopes will also be collected. A subset of wells will be sampled for per- and polyfluoroalkyl substances (PFAS), emerging industrial...
By
Pennsylvania Water Science Center
Pesticides in Pennsylvania Groundwaters

Pesticides in Pennsylvania Groundwaters

USGS annually samples domestic groundwater wells to characterize pesticides, nutrients, and radon in agricultural areas, in cooperation with the Pennsylvania Department of Agriculture. Beginning in 2021, samples for major ions, trace elements, bacteria, and isotopes will also be collected. A subset of wells will be sampled for per- and polyfluoroalkyl substances (PFAS), emerging industrial...
Learn More
A rainbow arc over a large-volume public-supply well

Groundwater Quality Research

Every day, millions of gallons of groundwater are pumped to supply drinking water for about 140 million people, almost one-half of the Nation’s population. Learn about the quality and availability of groundwater for drinking, where and why groundwater quality is degraded, and where groundwater quality is changing.
By
Water Resources Mission Area, National Water Quality Program, Colorado Water Science Center, Dakota Water Science Center, Wyoming-Montana Water Science Center
Groundwater Quality Research

Groundwater Quality Research

Every day, millions of gallons of groundwater are pumped to supply drinking water for about 140 million people, almost one-half of the Nation’s population. Learn about the quality and availability of groundwater for drinking, where and why groundwater quality is degraded, and where groundwater quality is changing.
Learn More
Salt-encrusted soils in the Colorado River Basin

Chloride, Salinity, and Dissolved Solids

All natural waters contain some dissolved solids (salinity) from contact with soils, rocks, and other natural materials. Too much, though, and dissolved solids can impair water use. Unpleasant taste, high water-treatment costs, mineral accumulation in plumbing, staining, corrosion, and restricted use for irrigation are among the problems associated with elevated concentrations of dissolved solids.
By
Water Resources Mission Area, National Water Quality Program
Chloride, Salinity, and Dissolved Solids

Chloride, Salinity, and Dissolved Solids

All natural waters contain some dissolved solids (salinity) from contact with soils, rocks, and other natural materials. Too much, though, and dissolved solids can impair water use. Unpleasant taste, high water-treatment costs, mineral accumulation in plumbing, staining, corrosion, and restricted use for irrigation are among the problems associated with elevated concentrations of dissolved solids.
Learn More
Large-volume public supply well

Public Supply Wells

Are you among the more than 100 million people in the U.S. who relies on a public-supply well for your drinking water? Although the quality of finished drinking water from public water systems is regulated by the EPA, long-term protection and management of the raw groundwater tapped by public-supply wells requires an understanding of the occurrence of contaminants in this invisible, vital resource...
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Water Resources Mission Area, National Water Quality Program
Public Supply Wells

Public Supply Wells

Are you among the more than 100 million people in the U.S. who relies on a public-supply well for your drinking water? Although the quality of finished drinking water from public water systems is regulated by the EPA, long-term protection and management of the raw groundwater tapped by public-supply wells requires an understanding of the occurrence of contaminants in this invisible, vital resource...
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Pesticides in groundwater can eventually contaminate well water.

Groundwater Quality in Principal Aquifers of the Nation, 1991–2010

What’s in your groundwater? Learn about groundwater quality in the Principal Aquifers of nine regions across the United States in informative circulars filled with figures, photos, and water-quality information.
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Water Resources Mission Area
Groundwater Quality in Principal Aquifers of the Nation, 1991–2010

Groundwater Quality in Principal Aquifers of the Nation, 1991–2010

What’s in your groundwater? Learn about groundwater quality in the Principal Aquifers of nine regions across the United States in informative circulars filled with figures, photos, and water-quality information.
Learn More
The Upper Floridan aquifer is close to land surface and in some areas is in direct contact with streams in the lower ACF Basin.

Groundwater Quality—Current Conditions and Changes Through Time

Is groundwater the source of your drinking water? The USGS is assessing the quality of groundwater used for public supply using newly collected data along with existing water-quality data. Learn more about this invisible, vital resource so many of us depend on.
By
Water Resources Mission Area, National Water Quality Program
Groundwater Quality—Current Conditions and Changes Through Time

Groundwater Quality—Current Conditions and Changes Through Time

Is groundwater the source of your drinking water? The USGS is assessing the quality of groundwater used for public supply using newly collected data along with existing water-quality data. Learn more about this invisible, vital resource so many of us depend on.
Learn More
Gas Station

Volatile Organic Compounds (VOCs)

Volatile organic compounds (VOCs) are chemicals that both vaporize into air and dissolve in water. VOCs are pervasive in daily life, because they’re used in industry, agriculture, transportation, and day-to-day activities around the home. Once released into groundwater, many VOCs are persistent and can migrate to drinking-water supply wells.
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Water Resources Mission Area, National Water Quality Program
Volatile Organic Compounds (VOCs)

Volatile Organic Compounds (VOCs)

Volatile organic compounds (VOCs) are chemicals that both vaporize into air and dissolve in water. VOCs are pervasive in daily life, because they’re used in industry, agriculture, transportation, and day-to-day activities around the home. Once released into groundwater, many VOCs are persistent and can migrate to drinking-water supply wells.
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Screenshot from Decadal Change in Groundwater Quality application

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
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Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, National Water Quality Program, Toxic Substances Hydrology
USGS Online Mapper Provides a Decadal Look at Groundwater Quality

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
Learn More
Screenshot from Decadal Change in Groundwater Quality application

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, National Water Quality Program, Toxic Substances Hydrology
USGS Online Mapper Provides a Decadal Look at Groundwater Quality

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
Learn More
Screenshot from Decadal Change in Groundwater Quality application

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, National Water Quality Program, Toxic Substances Hydrology
USGS Online Mapper Provides a Decadal Look at Groundwater Quality

USGS Online Mapper Provides a Decadal Look at Groundwater Quality

A new online interactive mapping tool provides summaries of decadal-scale changes in groundwater chemistry across the Nation.
Learn More
Filter Total Items: 17

Water Quality Data for Multidecadal Change in Pesticide Concentrations Relative to Human Health Benchmarks in the Nation’s Groundwater Water Quality Data for Multidecadal Change in Pesticide Concentrations Relative to Human Health Benchmarks in the Nation’s Groundwater

In the United States, the widespread use of pesticides has led to contamination of groundwater resources. Three decades ago, the U.S. Geological Survey (USGS) established a national water quality monitoring network for groundwater (NWQN-GW). This network provides an overview of groundwater conditions across a wide range of hydrogeologic settings and capture the impacts of pesticide use...
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Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2024 Data from Decadal Change in Groundwater Quality Web Site, 1988-2024

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
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Water Resources Mission Area

Nitrate and Chloride Data for evaluating Decadal Changes in Groundwater Nitrate and Chloride Data for evaluating Decadal Changes in Groundwater

The U.S. Geological Survey’s National Water Quality Network (NWQN) is the primary source of data to monitor trends in contaminants in groundwater in the United States. However, other data sources are available to evaluate trends. The Water Quality Portal (WQP) and the National Groundwater Monitoring Network (NGWMN) portal provide data that can be used for groundwater quality trends in...
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Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2022 Data from Decadal Change in Groundwater Quality Web Site, 1988-2022

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2021 Data from Decadal Change in Groundwater Quality Web Site, 1988-2021

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 4.0, April 2025) Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 4.0, April 2025)

Groundwater samples were collected and analyzed from 1,015 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program and the water-quality data and quality-control data are included in this data release. The samples were collected from three types of well networks: principal aquifer study networks, which are used to assess...
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Water Resources Mission Area

Data for volatile organic compounds in groundwater used for public supply across the United States, 2013-19, and data for associated quality-control samples Data for volatile organic compounds in groundwater used for public supply across the United States, 2013-19, and data for associated quality-control samples

This data release includes tables and time-series plots of results for volatile organic compounds (VOCs) analyzed in samples of groundwater used for public supply that were collected by the USGS National Water-Quality Assessment (NAWQA) Project and the California State Water Resources Control Board’s Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP)...
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Water Resources Mission Area

Geochemical and Geospatial Data for Per- and Polyfluoroalkyl Substances (PFAS) in Groundwater Used As a Source of Drinking Water in the Eastern United States Geochemical and Geospatial Data for Per- and Polyfluoroalkyl Substances (PFAS) in Groundwater Used As a Source of Drinking Water in the Eastern United States

Concentrations of inorganic constituents, dissolved organic carbon (DOC), tritium, per- and polyfluoroalkyl substances (PFAS), volatile organic compounds (VOCs), and pharmaceuticals were measured in groundwater samples collected from 254 wells in 2019 and 2020. Concentrations of inorganic constituents, DOC, VOCs, and pharmaceuticals were measured at the U.S. Geological Survey (USGS)...
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Water Resources Mission Area, Environmental Health Program

Data from Decadal Change in Groundwater Quality Web Site, 1988-2020 Data from Decadal Change in Groundwater Quality Web Site, 1988-2020

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Inorganic Constituent and Ancillary Data for Evaluation of Lithium in Groundwater in the United States, 1991-2018 Inorganic Constituent and Ancillary Data for Evaluation of Lithium in Groundwater in the United States, 1991-2018

Lithium concentrations in untreated groundwater from 1,464 public-supply wells, 1,676 domestic-supply wells, and 1,560 monitoring wells distributed across 33 principal aquifers in the United States were evaluated for spatial variations and possible explanatory factors. For context, lithium concentrations are compared to a drinking-water only threshold (60 mg/L) and a Health-Based...
By
Water Resources Mission Area

Data from Decadal Change in Groundwater Quality Web Site, 1988-2018 Data from Decadal Change in Groundwater Quality Web Site, 1988-2018

Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later...
By
Water Resources Mission Area

Data for Time Scales of Arsenic Variability and the Role of High-Frequency Monitoring at Three Water-Supply Wells in New Hampshire, USA Data for Time Scales of Arsenic Variability and the Role of High-Frequency Monitoring at Three Water-Supply Wells in New Hampshire, USA

This data release consists of data (in four tables) for assessing the time scales of arsenic variability in three production wells in New Hampshire; tables that describe the data fields in the data tables are also included in the data release. High-frequency (every 5 to 15 minutes) and bi-monthly water-quality monitoring of a bedrock-aquifer domestic well (425651070573701), a bedrock...
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New England Water Science Center
Plot of Radium concentration vs. road salt application rate
Plot of decadal change in Radium concentration vs. road salt application rate
Plot of decadal change in Radium concentration vs. road salt application rate
Plot of Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Graph of decadal change in Radium concentration compared to road salt application rate (Lindsay and others, 2021). Increases in concentrations of radium are correlated with road-salt application, and multiple lines of evidence support that the relation is causal. 

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Water Resources, National Water Quality Program, National Water Quality Laboratory
Plot of Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Plot of decadal change in Radium concentration vs. road salt application rate

Graph of decadal change in Radium concentration compared to road salt application rate (Lindsay and others, 2021). Increases in concentrations of radium are correlated with road-salt application, and multiple lines of evidence support that the relation is causal. 

By
Water Resources, National Water Quality Program, National Water Quality Laboratory
Filter Total Items: 59

Multidecadal change in pesticide concentrations relative to human health benchmarks in the Nation’s groundwater Multidecadal change in pesticide concentrations relative to human health benchmarks in the Nation’s groundwater

Groundwater-quality trend assessments identify aquifers that are responding to changes in pesticide use and the compounds that may pose a threat to water availability. The U.S. Geological Survey has been monitoring pesticide concentrations in groundwater for 25 principal aquifers across the conterminous United States since 1993. The groundwater well locations represent a range of soils...
Authors
Sarah M. Stackpoole, Bruce D. Lindsey, Cee S. Nell
By
Water Resources Mission Area

PFAS sampling activities in the U.S. Geological Survey national networks PFAS sampling activities in the U.S. Geological Survey national networks

Per- and polyfluoroalkyl substances (PFAS), frequently called “forever chemicals,” are used for a wide variety of industrial purposes and are often found in common household and industrial items such as firefighting foams, non-stick cookware, and water-resistant materials. The contamination of water, air, and soil by PFAS is a national and global issue due to their widespread occurrence...
Authors
Melissa L. Riskin, Bruce D. Lindsey, Ryan Conner McCammon
By
Water Resources Mission Area

The U.S. Geological Survey National Water Quality Network—Groundwater, 2024 The U.S. Geological Survey National Water Quality Network—Groundwater, 2024

The U.S. Geological Survey (USGS) operates a National Water Quality Network (NWQN) to monitor trends in groundwater quality and assess emerging contaminants of concern. It is a “network of networks” with 81 subnetworks being sampled on a decadal time scale. Each year, 8 of the subnetworks are sampled. Subnetworks have 20–30 wells each and include studies of domestic supply wells or...
Authors
Bruce D. Lindsey, James A. Kingsbury, Leah Marissa Santangelo
By
Water Resources Mission Area

The U.S. Geological Survey National Water Quality Network—Groundwater—2023 The U.S. Geological Survey National Water Quality Network—Groundwater—2023

The U.S. Geological Survey (USGS) operates a National Water Quality Network (NWQN) to monitor trends in groundwater quality and assess emerging contaminants of concern. It is a “network of networks” with 81 subnetworks being sampled on a decadal time scale. Each year, eight of the subnetworks are sampled. Subnetworks have 20–30 wells each and include studies of domestic supply wells or...
Authors
Bruce D. Lindsey, James A. Kingsbury
By
Water Resources Mission Area

Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States

Per- and polyfluoroalkyl substances (PFAS), known colloquially as “forever chemicals”, have been associated with adverse human health effects and have contaminated drinking water supplies across the United States owing to their long-term and widespread use. People in the United States may unknowingly be drinking water that contains PFAS because of a lack of systematic analysis...
Authors
Andrea K. Tokranov, Katherine Marie Ransom, Laura M. Bexfield, Bruce D. Lindsey, Elise Watson, Danielle Dupuy, Paul Stackelberg, Miranda S. Fram, Stefan Voss, James A. Kingsbury, Bryant Jurgens, Kelly Smalling, Paul M. Bradley
By
Water Resources Mission Area, National Water Quality Program, California Water Science Center, New England Water Science Center, New Jersey Water Science Center, New Mexico Water Science Center, South Atlantic Water Science Center (SAWSC), Lower Mississippi-Gulf Water Science Center

State of science, gap analysis, and prioritization for southeastern United States water-quality impacts from coastal storms—Fiscal year 2023 program report to the Water Resources Mission Area from the Water Availability Impacts of Extreme Events Program—H State of science, gap analysis, and prioritization for southeastern United States water-quality impacts from coastal storms—Fiscal year 2023 program report to the Water Resources Mission Area from the Water Availability Impacts of Extreme Events Program—H

Tropical cyclones (coastal storm events that include tropical depressions, tropical storms, and hurricanes) cause landscape-scale disturbances that can lead to impaired water quality and thus reduce water availability for use. Stakeholders and scientists at local and national scales have illustrated a need for understanding these risks to water quality. A regional and comprehensive...
Authors
Lisamarie Windham-Myers, Tara L. Root, Matthew D. Petkewich, MaryLynn Musgrove, Amy C. Gill, J. Curtis Weaver, Christopher H. Conaway, Bruce D. Lindsey, Francis Parchaso, Noah Knowles, Elizabeth J. Tomaszewski
By
Water Resources Mission Area, Caribbean-Florida Water Science Center (CFWSC), South Atlantic Water Science Center (SAWSC), Oklahoma-Texas Water Science Center, Lower Mississippi-Gulf Water Science Center

Thirty years of regional groundwater-quality trend studies in the United States: Major findings and lessons learned Thirty years of regional groundwater-quality trend studies in the United States: Major findings and lessons learned

Changes in groundwater quality have been evaluated for more than 2,200 wells in 25 Principal Aquifers in the United States based on repeated decadal sampling (once every 10 years) from 1988 to 2021. The purpose of this study is to identify contaminants with changing concentrations, the locations and magnitude of those changes, the factors driving those changes, the obstacles to...
Authors
Bruce D. Lindsey, Brandon J. Fleming, Phillip J. Goodling, Amanda Nicole May
By
Water Resources Mission Area, Maryland-Delaware-D.C. Water Science Center, New York Water Science Center, Pennsylvania Water Science Center

Integrated water resources trend assessments: State of the science, challenges, and opportunities for advancement Integrated water resources trend assessments: State of the science, challenges, and opportunities for advancement

Water is vital to human life and healthy ecosystems. Here we outline the current state of national-scale water resources trend assessments, identify key gaps, and suggest advancements to better address critical issues related to changes in water resources that may threaten human development or the environment. Questions like, “Do we have less suitable drinking water now than we had 20...
Authors
Sarah M. Stackpoole, Gretchen P. Oelsner, Edward G. Stets, Jory Seth Hecht, Zachary Johnson, Anthony J. Tesoriero, Michelle A. Walvoord, Jeffrey G. Chanat, Krista A. Dunne, Phillip J. Goodling, Bruce D. Lindsey, Michael Meador, Sarah Spaulding
By
Water Resources Mission Area

Quality of groundwater used for public supply in the continental United States: A comprehensive assessment Quality of groundwater used for public supply in the continental United States: A comprehensive assessment

The presence of contaminants in a source water can constrain its suitability for drinking. The quality of groundwater used for public supply was assessed in 25 principal aquifers (PAs) that account for 84% of groundwater pumped for public supply in the U.S. (89.6 million people on a proportional basis). Each PA was sampled across its lateral extent using an equal-area grid, typically...
Authors
Kenneth Belitz, Miranda S. Fram, Bruce D. Lindsey, Paul Stackelberg, Laura M. Bexfield, Tyler D. Johnson, Bryant Jurgens, James A. Kingsbury, Peter B. McMahon, Neil M. Dubrovsky
By
Water Resources Mission Area, California Water Science Center, Colorado Water Science Center, New Mexico Water Science Center

Global groundwater solute composition and concentrations Global groundwater solute composition and concentrations

Informed analysis of policies related to food security, global climate change, wetland ecology, environmental nutrient flux, element cycling, groundwater weathering, continental denudation, human health, etc. depends to a large extent on quantitative estimates of solute mass fluxes into and out of all global element pools including the enigmatic global aquifer systems. Herein for the...
Authors
Warren W. Wood, Pauline L. Smedley, Bruce D. Lindsey, Warren T. Wood, Roberto E. Kirchheim, John A. Cherry
By
Water Resources Mission Area

Volatile organic compounds in groundwater used for public supply across the United States: Occurrence, explanatory factors, and human-health context Volatile organic compounds in groundwater used for public supply across the United States: Occurrence, explanatory factors, and human-health context

This systematic assessment of occurrence for 85 volatile organic compounds (VOCs) in raw (untreated) groundwater used for public supply across the United States (U.S.), which includes 43 compounds not previously monitored by national studies, relates VOC occurrence to explanatory factors and assesses VOC detections in a human-health context. Samples were collected in 2013 through 2019...
Authors
Laura M. Bexfield, Kenneth Belitz, Miranda S. Fram, Bruce D. Lindsey
By
Water Resources Mission Area, California Water Science Center, New Mexico Water Science Center

Perfluoroalkyl and polyfluoroalkyl substances in groundwater used as a source of drinking water in the eastern United States Perfluoroalkyl and polyfluoroalkyl substances in groundwater used as a source of drinking water in the eastern United States

In 2019, 254 samples were collected from five aquifer systems to evaluate per- and polyfluoroalkyl substance (PFAS) occurrence in groundwater used as a source of drinking water in the eastern United States. The samples were analyzed for 24 PFAS, major ions, nutrients, trace elements, dissolved organic carbon (DOC), volatile organic compounds (VOCs), pharmaceuticals, and tritium. Fourteen...
Authors
Peter B. McMahon, Andrea K. Tokranov, Laura M. Bexfield, Bruce D. Lindsey, Tyler D. Johnson, Melissa A. Lombard, Elise Watson
By
Water Resources Mission Area, Environmental Health Program, California Water Science Center, Colorado Water Science Center, New England Water Science Center, New Mexico Water Science Center, Pennsylvania Water Science Center
Three decades of groundwater-quality data across the nation

Three decades of groundwater-quality data across the nation

National report summarizes 30 years of groundwater-quality data, including analysis of contaminants.

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Lithium in U.S. Groundwater

Lithium in U.S. Groundwater

A new USGS study reports that about 45% of public-supply wells and about 37% of U.S. domestic supply wells have concentrations of lithium that could...

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Groundwater age-dating simplified

Groundwater age-dating simplified

A new USGS report documents a simple method to classify groundwater age as premodern (recharged before 1953), modern (recharge in 1953 or later), or a...

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Groundwater Quality in the Midwest: The Cambrian-Ordovician Aquifer System

Groundwater Quality in the Midwest: The Cambrian-Ordovician Aquifer System

A regional assessment of untreated groundwater in the Cambrian-Ordovician aquifer system, which includes parts of Minnesota, Wisconsin, Michigan, Iowa...

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Groundwater Quality in the Southwest: The Rio Grande Aquifer System

Groundwater Quality in the Southwest: The Rio Grande Aquifer System

A regional assessment of untreated groundwater in the Rio Grande aquifer system, which includes parts of Colorado, New Mexico and Texas, is now...

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Groundwater Quality in Eastern U.S.

Groundwater Quality in Eastern U.S.

A regional assessment of untreated groundwater in the combined Valley and Ridge and Piedmont and Blue Ridge aquifers in the eastern United States is...

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Groundwater Quality in the Northern Atlantic Coastal Plain Aquifer System

Groundwater Quality in the Northern Atlantic Coastal Plain Aquifer System

A regional assessment of untreated groundwater in the Northern Atlantic Coastal Plain aquifer system in the eastern United States is now available...

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