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The National Water Quality Program provides an understanding of water-quality conditions; whether conditions are getting better or worse over time; and how natural features and human activities affect those conditions.
More about this programPesticides in U.S. Streams and Rivers
During the 20 years from 1992 to 2011, pesticides were found at concentrations that exceeded aquatic-life benchmarks in many rivers and streams that drain agricultural, urban, and mixed-land use watersheds.
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The Quality of the Nation’s Groundwater: Progress on a National Survey
This story was updated on December 7, 2017.
The U.S. Geological Survey is near the midpoint of a complex undertaking to survey the quality of the nation’s largest drinking-water resource.
Groundwater Quality in the East: The Piedmont and Blue Ridge Crystalline-Rock Aquifers
A regional assessment of untreated groundwater in the Piedmont and Blue Ridge crystalline-rock aquifers, which includes parts of 11 states across the contiguous United States, is now available from the U.S. Geological Survey.
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, Illinois, Missouri and Indiana, is now available from the U.S. Geological Survey.
Great Salt Lake Basins National Water Quality Assessment
The Great Salt Lake Basins (GRSL) National Water Quality Assessment (NAWQA) was one of 51 study units across the country. Started in 1998, the long-term goals of this program were to describe the status and trends in the quality of a large, representative part of the Nation's surface- and ground-water resources, and to provide a sound, scientific understanding of the primary factors affecting...
SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California
SPARROW can be used to relate water-quality data to landscape characteristics, such as natural properties and human activities
National Water-Quality Program Monitoring Networks, Arizona, 2013-2023
The Arizona Water Science Center collects water-quality data from stream and aquifer sites in networks that are part of the National Water-Quality Program (NWQP) and the National Stream Quality Accounting Network (NASQAN).
NAWQA Regional Stream Quality Assessment
How is stream ecology affected by chemical and physical stressors in small streams? The U.S. Geological Survey (USGS) is addressing this question through studies of relations between stressors and stream ecology across large regions of the United States.
Transport and Fate of Nutrients
Eutrophication, or excess nutrients in streams, is typically one of the top reasons that a stream is listed as impaired on the 303(d) list as part of the Clean Water Act. How nutrients, primarily nitrogen and phosphorus, are transported to streams and groundwater greatly affects the best management plan to keep them on fields and out of streams and groundwater. Likewise, environmental managers...
Effects of Nutrient Enrichment on Stream Ecosystems (Upper Snake River Basin NAWQA)
Nutrient enrichment can affect the ecological health of a stream. For example, excessive aquatic plant growth caused by increased nutrients can reduce dissolved oxygen necessary for other aquatic life. Topics of particular interest in this study area include:
seasonal patterns among nutrients, flows, algae and plants in streams
rooted aquatic plant vs. algae growth
stream...
White, Great, and Little Miami River (WHMI) NAWQA Groundwater Status And Trends
The White, Great, and Little Miami River (WHMI) Basins in Indiana and Ohio comprise one of more than 50 study units that are part of the USGS National Water Quality Assessment (NAWQA) Program. The long-term goals of the NAWQA program are to describe the water-quality status and trends in a large representative part of the Nation's surface-water and groundwater resources and to provide a sound...
Microbiological Monitoring Of Groundwater Used As A Source Of Drinking Water (NAWQA Cycle 3)
The National Water Quality Assessment Program (NAWQA) has been sampling public supply wells and domestic wells across the U.S. since 2013 for a broad suite of microbiological indicators including total coliform s , E. coli, enterococci, F-specific coliphage , somatic coliphage, and aerobic endospores. USGS scientists in Ohio and Massachusetts are collaborating on the analysis of...
Michigan Historical NAWQA Programs
The USGS implemented the National Water-Quality Assessment (NAWQA) Program in 1991 to develop long-term consistent and comparable information on streams, rivers, groundwater, and aquatic systems in support of national, regional, State, and local information needs and decisions related to water-quality management and policy.
NAWQA Surface Water National Fixed Network Site Status and Trends
As part of the USGS National Water Quality Assessment (NAWQA) program the USGS MIWSC operates a stream gage and routinely collects water quality samples at the Clinton River at Sterling Heights, MI. station. Water is analyzed for sediment, nutrients, major ions, and a suite of 271 different pesticides. Information obtained...
Groundwater Age Mixtures and Contaminant Trends Tool
Explore the effects of basic aquifer properties and well configurations on groundwater age mixtures in groundwater discharge and on contaminant trends from varying nonpoint-source contaminant input scenarios.
USGS Sediment Data Portal
Identify, access, and interpret USGS discrete and (or) daily suspended sediment data suspended-sediment and related data. The U.S. Geological Survey National Water Information System (NWIS) is the original source for all suspended-sediment data provided in the portal.
Water Quality Data Portal
The Water Quality Portal (WQP) is a cooperative service sponsored by the United States Geological Survey (USGS), the Environmental Protection Agency (EPA), and the National Water Quality Monitoring Council (NWQMC). It serves data collected by over 400 state, federal, tribal, and local agencies.
WaterQualityWatch
WaterQualityWatch provides access to USGS real time water-quality data collected in surface waters throughout the United States. Measurements include water temperature, specific conductance, pH, dissolved oxygen, turbidity, and nitrate.
National Atmospheric Deposition Program Animated Maps
View annual deposition maps of H+, sulfate, nitrate, ammonium, and total inorganice nitrogen across the Nation beginning in 1985.
BioData – Aquatic Bioassessment Data
Discover over 17,000 fish, macroinvertebrate, and algal samples and physical habitat data collected at over 2,000 sites by the USGS since 1991.
Predict Pesticide Levels in Streams and Rivers--Where is water quality at Risk?
Use the mapping tool to predict concentrations for 108 pesticides in streams and rivers across the Nation and identify which streams are most likely to exceed water-quality guidelines for human health or aquatic life.
Tracking the Source and Quantity of Nutrients to the Nation's Estuaries and Great Lakes
Access maps of watershed nutrient contributions to the Nation's Estuaries and Great Lakes
Estimated Annual Agricultural Pesticide Use
View the geographic distribution of estimated use of numerous pesticides on agricultural land in the conterminous United States. A graph accompanies each map, which shows annual national use by major crop for the mapped pesticide for each year during the period.
Tracking Water Quality of the Nation's Rivers and Streams
An online graphical data tool provides annual summaries of nutrient and sediment concentrations and loads and streamflow information for 106 sites monitored as part of the USGS National Water-Quality Network for Streams and Rivers.
Great Lakes SPARROW Mapper, 2002
This mapper displays SPARROW nutrient load and yield data specifically for U.S. tributaries to the Great Lakes. The results are based on the SPARROW models developed for the Great Lakes, Ohio, Upper Mississippi, Red River Basins (MRB3). Modeling results can be exported as an Excel spreadsheet or a geospatial dataset.
Mississippi/Atchafalaya River Basin (MARB) SPARROW Mapper, 2002
The mapper displays SPARROW nutrient load and yield data and the importance of various nutrient sources for the MARB, given nutrient inputs similar to 2002. Rankings can be shown by major watershed, state, HUC8, tributary, and catchment. Nutrient data can be explored using maps and interactive graphs and tables. Modeling results can be exported as an Excel spreadsheet or a geospatial dataset...
SPARROW modeling: Estimating contaminant transport
What’s New: A new version of the SPARROW code is being developed in the R programming language. The advantage of R is that it is non-proprietary and does not require a license or software cost. The R – SPARROW code is now being completed and should be available early in CY18. Stay Tuned.
USGS Continuous Nutrient Monitoring in the Mississippi River Basin
USGS “supergages” are very complex. Continuous concentrations of nutrients and streamflow are measured at supergages and the information is available to the public in real-time. A network of supergages are very important in the Mississippi River Basin for assessing the changes in the amount of nutrients that are transported to the hypoxic zone in the Gulf of Mexico. By monitoring and analyzing...
Landsat Views Massive Solar Energy Farms
Solar energy is booming worldwide, and these Landsat 8 images show three large solar energy farms.
Mt. Lyell and view of Vogelsang Pass, Yosemite National Park, 1913
Mt. Lyell and view of Vogelsang Pass, Yosemite National Park, 1913
USGS historical photogrpah by Richard B. Dole, 1913.
USGS scientists prepare water-quality instruments
USGS scientists prepare water-quality instruments before going out on the Great Salt Lake. USGS scientists are conducting a study to gain a better understanding of nutrient levels, which could help determine how to best manage algal bloom outbreaks.
USGS scientists conducting a study on the Great Salt Lake
USGS scientists conducting a study on the Great Salt Lake to gain a better understanding of nutrient levels, which could help determine how to best manage algal bloom outbreaks.
USGS scientists conducting a study on the Great Salt Lake
USGS scientists conducting a study on the Great Salt Lake to gain a better understanding of nutrient levels, which could help determine how to best manage algal bloom outbreaks.
Utah Nutrient Study
USGS scientists Bryan Downing, Mike Freeman and Katy O'Donnell measure nutrient levels in Goggin Drain, Utah. USGS scientists are conducting an experimental study on two Utah water bodies to gain a better understanding of nutrient levels, which could help determine how to best manage algal bloom outbreaks.
The Quality of the Nation’s Groundwater: Progress on a National Survey
This story was updated on December 7, 2017.
The U.S. Geological Survey is near the midpoint of a complex undertaking to survey the quality of the nation’s largest drinking-water resource.
Groundwater Quality in the East: The Piedmont and Blue Ridge Crystalline-Rock Aquifers
A regional assessment of untreated groundwater in the Piedmont and Blue Ridge crystalline-rock aquifers, which includes parts of 11 states across the contiguous United States, is now available from the U.S. Geological Survey.
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, Illinois, Missouri and Indiana, is now available from the U.S. Geological Survey.
Groundwater Quality in the North: The Glacial Aquifer System
A regional assessment of untreated groundwater in the Glacial aquifer system, which includes parts of 25 states across the northern contiguous United States, is now available from the U.S. Geological Survey.
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 available from the U.S. Geological Survey.
Scientists Home in on Causes of High Radium Levels in Key Midwestern Aquifer
Oxygen levels, dissolved minerals among factors responsible for high concentrations of radium in untreated water from aquifer that underlies six states
Pesticides Prevalent in Midwestern Streams
One hundred small streams in the Midwest were tested for pesticides during the 2013 growing season and found to contain, on average, 52 pesticides per stream
NOAA, USGS and partners predict third largest Gulf of Mexico summer ‘dead zone’ ever
Larger-than-average low and no oxygen area may affect the region’s shrimp fisheries
NOAA, USGS and partners predict larger summer ‘dead zone’ for the Chesapeake Bay
Low- and no-oxygen area threatens crabs, oysters, fish
Unconventional Oil and Gas Production Not Currently Affecting Drinking Water Quality
Decades or longer may be needed to fully assess the effects of unconventional oil and gas production on the quality of groundwater used for drinking water in Arkansas, Louisiana, and Texas
First-of-its-kind Interactive Map Brings Together 40 Years of Water-Quality Data
USGS provides a long-term look at changes in the quality of our nation’s rivers and streams
Groundwater Quality in the West: Examining Basin and Range Basin-Fill Aquifers
A regional assessment of untreated groundwater in the Basin and Range basin-fill aquifers, which include parts of Nevada, California, Arizona, Utah and adjacent states, is now available from the U.S. Geological Survey.
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