Where can I find information about my local drinking water supply?
The best way to learn about your local drinking water quality is to read the annual drinking water quality report/consumer confidence report that water suppliers now send out by July 1 of each year. The reports are often sent out with water bills, but they may be sent separately. The reports tell where drinking water comes from, what contaminants are in it, and at what levels.
The U.S. Environmental Protection Agency offers information about local drinking water systems through their Office of Ground Water and Drinking Water. Many water suppliers are now posting their water-quality monitoring results on the Web, and these results can be accessed from this site.
The National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey has completed a study that assesses water-quality conditions for about 2,100 domestic wells across the United States.
Learn more: USGS Drinking Water and Source Water Research
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The quality of our Nation's waters: Water quality in principal aquifers of the United States, 1991-2010
About 130 million people in the United States rely on groundwater for drinking water, and the need for high-quality drinking-water supplies becomes more urgent as our population grows. Although groundwater is a safe, reliable source of drinking water for millions of people nationwide, high concentrations of some chemical constituents can pose...
DeSimone, Leslie A.; McMahon, Peter B.; Rosen, Michael R.
The quality of our Nation's waters: factors affecting public-supply-well vulnerability to contamination: understanding observed water quality and anticipating future water quality
As part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program, a study was conducted from 2001 to 2011 to shed light on factors that affect the vulnerability of water from public-supply wells to contamination (referred to hereafter as “public-supply-well vulnerability”). The study was designed as a follow-up to earlier...
Eberts, Sandra M.; Thomas, Mary Ann; Jagucki, Martha L.
Tracking and forecasting the Nation’s water quality - Priorities and strategies for 2013-2023
Water-quality issues facing the Nation are growing in number and complexity, and solutions are becoming more challenging and costly. Key factors that affect the quality of our drinking water supplies and ecosystem health include contaminants of human and natural origin in streams and groundwater; excess nutrients and sediment; alteration of...
Rowe, Gary L.; Gilliom, Robert J.; Woodside, Michael D.
Quality of Water from Domestic Wells in Principal Aquifers of the United States, 1991-2004
As part of the National Water-Quality Assessment Program of the U.S. Geological Survey (USGS), water samples were collected during 1991-2004 from domestic wells (private wells used for household drinking water) for analysis of drinking-water contaminants, where contaminants are considered, as defined by the Safe Drinking Water Act, to be all...
DeSimone, Leslie A. Quality of Water from Domestic Wells in Principal Aquifers of the United States, 1991-2004: Overview of Major Findings
More than 43 million people - about 15 percent of the U.S. population - rely on domestic wells as their source of drinking water (Hutson and others, 2004). The quality and safety of water from domestic wells, also known as private wells, are not regulated by the Federal Safe Drinking Water Act or, in most cases, by state laws. Rather, individual...
DeSimone, Leslie A.; Hamilton, Pixie A.; Gilliom, Robert J.
The quality of our nation's waters; nutrients and pesticides; a summary
Nutrients in the Nation's Waters--Too Much of a Good Thing?
Historical data on nutrients (nitrogen and phosphorus) from about 12,000 ground-water and more than 22,000 stream samples have been compiled and related to possible sources. This existing information was collected by many agencies for a variety of purposes. Therefore, though it can be used to determine where concentrations differ, the exact...
Mueller, David K.; Helsel, Dennis R.
New Study Shows High Potential for Groundwater to be Corrosive in Half of U.S. States
An analysis of more than 20,000 wells nationwide shows 25 states have groundwater that has either high or very high potential to be corrosive...
Contaminants in Groundwater Used for Public Supply
More than 20 percent of untreated water samples from 932 public wells across the nation contained at least one contaminant at levels of potential health concern, according to a new study by the U.S. Geological Survey.
Man-Made Chemicals Found in Drinking Water at Low Levels
Low levels of certain man-made chemicals remain in public water supplies after being treated in selected community water facilities.
Pesticides in the Nation's Streams and Ground Water
Today, the U.S. Geological Survey released a report describing the occurrence of pesticides in streams and ground water during 1992-2001.
USGS Report Shows How We Use Ground Water From Principal Aquifers
In its latest report on water use in the United States, the USGS looked at the nation's dependence on ground water. The report entitled Estimated Withdrawals from Principal Aquifers in the United States, 2000, provides details of ground-water withdrawals and use from principal aquifers in each state.
Potential Corrosivity of Untreated Groundwater in the United States
- Corrosive groundwater, if untreated, can dissolve lead and other metals from pipes.
- National maps have been prepared to identify the occurrence of potentially corrosive groundwater in the U.S.
- These findings have the greatest implication for the 44 million people dependent on domestic wells for drinking water.
Glass of drinking water - municipal water use
Stock photo
Drinking water from tap
The quality of the water we drink can potentially impact our health. The USGS has several programs and cooperative projects that characterize the quality of selected rivers and aquifers used as sources of drinking water to community water systems in the United States.
Drought, Drinking Water and Natural Environments
This short video is one of a series of four total shorts highlighting USGS water science in California's Delta region. The Sacramento-San Joaquin Delta is the hub of the state's water system. Water quality touches on all aspects of life. Teams of U.S. Geological Survey scientists along with their partners monitor water quality and identify sources of pollution and
Map of Groundwater Corrosivity Potential
This map shows the potential for groundwater corrosivity in groundwater wells in all 50 states. It is a combination of two indices, shown below.
Collecting groundwater samples from a municipal well, Nebraska
Collecting groundwater samples from a municipal well as part of the NAWQA Principal Aquifer Study in Nebraska.
Acidifying a Drinking Water Quality Sample for MTBE Analysis
Sample collected from Madison Springs Hut in the White Mountains (~ 5,000 ft above sea level).