Groundwater provides more than 40 percent of California's drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State's groundwater quality and increases public access to groundwater-quality information. Two small watersheds of the Fresno and San Joaquin Rivers in the Central Sierra Nevada constitute one of the study units being evaluated.
Additional publication details
USGS Numbered Series
Groundwater quality in the Central Sierra Nevada, California
U.S. Geological Survey
California Water Science Center
Fresno River;Hensley Lake;Willow Creek;San Joaquin River