Superfund Information Systems: Site Profile

Superfund Site:



On this page:

About the Superfund Redevelopment Initiative

This nationally coordinated effort provides EPA and its partners with a process to return Superfund sites to productive use. Learn more at Superfund Redevelopment Initiative.

Top of Page

Redevelopment at the Site

The San Gabriel Valley (Area 1) Superfund site is one of four San Gabriel Valley Superfund sites in Southern California. The San Gabriel Valley Superfund sites include multiple areas of contaminated groundwater in the 170-square-mile San Gabriel Valley. In 1984, EPA listed the four main areas of groundwater contamination in the valley on the Superfund program’s National Priorities List (NPL). The Area 1 site includes about 11 square miles of groundwater contamination underlying portions of the cities of El Monte, Rosemead, South El Monte, Whittier, an other areas. In addition to industrial, commercial, residential and open space land uses, portions of the site support recreational uses and flood control. EPA has overseen treatment of groundwater in Area 1 since the early 2000s. EPA continues to oversee the construction of additional groundwater treatment systems. Investigations and studies are also underway, including an effort to identify the sources of contamination. To date, investigators have found soil contamination at nearly 400 individual facilities. Water utilities in the area provide clean water that meets all state and federal drinking water standards.

Top of Page

Economic Activity at the Site

As of December 2018, EPA did not have economic data related to on-site businesses, or economic data were not applicable due to site use. View information about redevelopment economics at Superfund sites.

Top of Page