USGS provides online access to water-resources data collected at approximately 1.5 million sites in all 50 states, the District of Columbia, and Puerto Rico.
The USGS National Water Information System (NWIS) contains extensive water data for the Nation. Public access to many of these data is provided via NWISWeb (additional background).
U.S. Geological Survey report concerning concentrations and distributions of pesticides in relation to water sources.
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