Groundwater is being sampled at many locations across California in order to characterize its constituents and identify trends in groundwater quality by the Groundwater Ambient Monitoring and Assessment (GAMA) Program. As part of this program, the following wells are being sampled:
For more Central Valley water quality data, please visit the following links:
In 1991, the U.S. Geological Survey began a full-scale National Water-Quality Assessment (NAWQA) Program, to address the need for consistent and scientifically sound information for managing the Nation's water resources. This program is unique compared to other national water-quality assessment studies in that it integrates the monitoring of the quality of surface- and ground-waters with the study of aquatic ecosystems.
USGS NAWQA study units in the Central Valley: