2012 CPEO Military List Archive

From: Lenny Siegel <lsiegel@cpeo.org>
Date: Tue, 17 Jul 2012 10:09:50 -0700 (PDT)
Reply: cpeo-military
Subject: [CPEO-MEF] PERCHLORATE: High levels found in Inland Empire (CA) aquifers
News Release
U.S. Geological Survey
July 16, 2012

High Concentrations of Nitrate and Perchlorate in Some Inland Empire Groundwater

SAN DIEGO, Calif. - Nitrate was detected at high concentrations in one quarter of the aquifer system used for Inland Empire public water supply. Additionally, high concentrations of perchlorate were found in 11 percent of the aquifer system, and in moderate concentrations in 53 percent. This aquifer system includes the Upper Santa Ana Valley, San Jacinto, and Elsinore groundwater basins, although, high nitrate and perchlorate concentrations were not found in the Elsinore groundwater basin.

As part of a statewide study assessing groundwater quality, U.S. Geological Survey scientists analyzed untreated groundwater from wells, not treated tap water, looking for over 300 possible constituents. Groundwater is typically treated by water purveyors prior to delivering it to customers to ensure compliance with water quality standards.

"Over a ten-year period, the USGS is characterizing groundwater quality in 120 basins that supply about 95 percent of public groundwater supplies," explained USGS director Marcia McNutt. "The new results for the Upper Santa Ana Watershed show where, what, and how much contamination is in the groundwater, focusing attention on improving water quality where it is needed."


For the entire release and a link to the full report, see


Lenny Siegel
Executive Director, Center for Public Environmental Oversight
a project of the Pacific Studies Center
278-A Hope St., Mountain View, CA 94041
Voice: 650/961-8918 or 650/969-1545
Fax: 650/961-8918

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