Contamination of the groundwater by volatile organic compounds (VOCs) was first detected in 1979 when Aerojet Electrosystems in Azusa sampled nearby wells in the Valley County Water District.

Subsequently, the California Department of Health Services (CDHS) initiated a well sampling program to assess the extent of contamination.

The sites include four large areas of groundwater contamination that underlie significant portions of the Cities of Alhambra, Arcadia, Azusa, Baldwin Park, Industry, El Monte, La Puente, Monrovia, Rosemead, South El Monte, West Covina, and other areas of the 170 square-mile San Gabriel Valley.

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An Interim Record of Decision (ROD) was signed in September 2000.

An ESD was issued in 2005 to address the treatment of emerging chemicals.

A Five Year Review for the entire Area 1 Site was completed in 2013.

Source Identification and Control: The California Regional Water Quality Control Board, Los Angeles Region, Whittier Narrows Area: In 1987, the EPA began a study of the nature and extent of contamination in the Whittier-Narrows area of the San Gabriel Valley.

By 1984, 59 wells were found to be contaminated with high levels of VOCs.

Hundreds of individual facilities could be contributing to the contamination in the basin through improper handling and disposal practices.Over 400 water supply wells are used in the basin to extract groundwater for industrial, business, agricultural, and domestic uses.Forty-five different water suppliers operate in the basin and provide drinking water to more than 1,000,000 people.The facility consists of seven groundwater extraction wells, conveyance pipelines, and 20 pairs of granular activated carbon (GAC) filter vessels for removal of VOCs.EPA has entered into an agreement with the City of Whittier to operate and maintain the treatment facility and to supply treated water to local businesses and residents.El Monte : In March 1995, an agreement was reached between U. An Explanation of Significant Differences was signed in 2002 which incorporated treatment for emergent chemicals in the area.