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Contact Superfund, Pacific Southwest

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Site Assessment

National Information
Regional Information
  • Naturally Occurring Asbestos
  • EPA's site assessment work in El Dorado County, California, where airborne naturally occurring asbestos particles may be cause for concern
Photo of:
Activity-based asbestos sampling at El Dorado Hills

EPA Region 9's Site Assessment program works with states and tribes to assess and prioritize hazardous waste sites for cleanup. We evaluate sites to determine whether they qualify for listing on the National Priorities List (NPL) and consult with states and affected tribes to determine which sites should be listed. Currently, 111 sites in our Region are final or proposed on the NPL and an additional 13 sites have been deleted.

During the past ten years, state cleanup programs have evolved significantly with EPA's assistance. Many states are now able to oversee complex cleanups that in the past would have required listing on the NPL. While many sites qualify for NPL listing, EPA now only lists sites that are too complex, contentious or expensive for states to address under their own cleanup authorities. Region 9 has referred 170 NPL-caliber sites to states and other entities for cleanup.

Since 1981, EPA Region 9, with the support of our states and tribes, has identified more than 5000 sites. We have determined that 4200 of these sites do not require federal long-term response and we have removed these sites from our active inventory. Currently, Region 9 has approximately 640 sites that require assessment.

Site Assessment Process
Describes the site assessment process and how sites are added to the National Priorities List of Superfund sites.

Sites proposed to the NPL
Provides information on sites that were recently proposed to be added to the NPL.

Search sites database (CERCLIS)
Search for information on sites that have been evaluated by site name, ZIP code, state, and other parameters

State and tribal agency links
Provides links to state and tribal agency cleanup websites.


Additional Technical Information

Information about EPA's site assessment work in El Dorado County, California (see photo above), where airborne naturally occurring asbestos particles may be cause for concern.

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