Primary homepage for the National Water Quality Assessment (NAWQA) Program studying water quality in river, aquifer and coastal water basins throughout the nation. Links to reports, data, models, maps and national synthesis studies.
Homepage of the Office of Water Quality programs on the quality of the Nation's surface water and ground water resources, with links to general information, quality assurance, software, data, publications, USGS facilities, techniques, and programs.
Homepage for USGS water quality information. The NWISWeb discrete sample database is a compilation of over 3.5 million historical water quality analyses in the USGS district databases. Also includes access to real-time data and a tutorial.
Trace elements are inorganic chemicals occurring in small amounts in nature. This web site of the National Water Quality Assessment links to U.S. data, publications, news, and other sites on trace metals, metalloids and radionuclides in water.
This Nutrients National Synthesis Project site on the U.S. study of nutrients, especially nitrogen and phosphorus, as contaminants in high concentrations links to an overview, study team, featured reports, publications, and national datasets.
Thirty year database of water-quality data, visual data displays, and project information on the San Francisco Bay directed towards following and understanding changes in the water quality of San Francisco Bay.
The National Water Quality Laboratory (NWQL) is a full-service laboratory that specializes in environmental analytical chemistry and has a primary role to develop new analytical methods. Links to directory, publications, and standards.
The Puget Sound Basin is a National Water Quality Assessment (NAWQA) Program study unit for studying the status, trends, and changes affecting the nation's water quality. Site links to data, publications, and results.