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Quality of groundwater used for domestic drinking-water supply in the Coachella Valley, 2020

January 13, 2023

Groundwater is the primary source of drinking water in the Coachella Valley in the desert region of southern California. Although most people in Coachella Valley are served by public drinking-water systems, about 20,000 people rely on private domestic or small-system wells (referred to herein as domestic wells). Recently, the U.S. Geological Survey (USGS) found that 39 percent of the groundwater resources used by domestic wells in Coachella Valley contained arsenic, fluoride, or both constituents at concentrations greater than the maximum contaminant levels established for public drinking-water systems. Uranium, chromium, nitrate, and perchlorate were detected at moderate concentrations below maximum contaminant levels. Elevated (above background) perchlorate concentrations in some areas indicate that domestic wells may receive recharge from Colorado River water used for irrigation or aquifer replenishment. Moderate total dissolved solids (TDS) concentrations throughout the study area and the co-occurrence of high concentrations of TDS and perchlorate indicates that Colorado River water is a source of recharge in the southeastern Indio groundwater subbasin. Four volatile organic compounds were detected at low concentrations, and pesticides and per- and polyfluoroalkyl substances were not detected.

Citation Information

Publication Year 2023
Title Quality of groundwater used for domestic drinking-water supply in the Coachella Valley, 2020
DOI 10.3133/ofr20221122
Authors Andrew L. Soldavini, Jennifer S. Harkness, Zeno F. Levy, Miranda S. Fram
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2022-1122
Index ID ofr20221122
Record Source USGS Publications Warehouse
USGS Organization California Water Science Center

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