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This focuses on how we use groundwater age to predict changes in nitrate concentrations over time. Typically, deep public supply wells draw from deeper parts of the aquifer where water is decades, centuries, or even millenia old.

The USGS first identified uranium as a potential issue in California's groundwater during studies conducted in the Modesto area funded by the USGS National Water Quality Assessment Program. Subsequently, the GAMA program undertook a broader analysis of uranium concentrations across the State.

Arsenic is known to be a problem in groundwater used for drinking water supplies in the San Joaquin Valley. About 10% of the are of groundwater resources used for public supply contain more than the USEPA MCL of 10 µg/L. Most public-supply and domestic wells currently yield groundwater with arsenic levels below 3 µg/L and do not exhibit trends in concentration.

This interactive map summarizes historical groundwater sampling for nitrate in the Albuquerque Basin, potential sources of nitrate in groundwater, and other complementary data.

The Baseflow Forecast Web Tool allows you to access baseflow forecasts at thousands of locations across the Nation.

Tunnicliff wetland sites in Montana

Sportsman wetland sites in Montana

Silicon Mountain wetland sites in Montana

Schrieber wetland sites in Montana

Rostad wetland sites in Montana

Richardson wetland sites in Montana

McGinnis Meadows wetland sites in Montana