USGS GAMA Domestic Well (Shallow Aquifer) Assessment Study Units

In 2012, the Groundwater Ambient Monitoring & Assessment Priority Basin Project (GAMA-PBP) began water-quality assessments of shallow aquifers, the groundwater resources typically used for private domestic and small system drinking-water supplies. These groundwater resources often are shallower than the groundwater resources used for public drinking-water supplies.

GAMA-PBP is designed to identify where and to what extent water quality of groundwater aquifers meets benchmarks that have been established for drinking water. Results of GAMA-PBP sampling are used to determine how groundwater quality is changing and to help explain patterns in chemical concentrations at the basin scale.