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Groundwater quality in the Northern San Joaquin Valley, California

http://pubs.usgs.gov/fs/2010/3079/

Arsenic and boron were the trace elements that most frequently occurred at high concentrations. Fumigants (pesticides) were detected at high concentrations in 3% of the primary aquifers. Herbicides and insecticides were detected at low concentrations.

by Bennett, George L. V and Belitz, Kenneth
U.S. Geological Survey Fact Sheet 2010-3079
Related topics:
Arsenic, Groundwater quality, Pesticide and herbicide contamination, Toxic radionuclide contamination, Toxic trace element contamination
States or counties
Calaveras, Contra Costa, San Joaquin, Stanislaus

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