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Orange County North Basin Superfund Site

The Orange County North Basin Superfund Site focuses on a six-and-a-half-square-mile portion of the groundwater aquifer located under Fullerton, Anaheim, Placentia and Buena Park.

Manufacturing industries operating primarily in the 1950s through mid-1980s left a legacy of industrial pollutants at their former factories. The pollutants, mostly volatile organic compounds (VOCs) used as decreasing solvents, have migrated through the soils and into the underlying groundwater. These VOCs have impacted nearby water supply wells causing six of them to be taken out of service.

The site is listed by the U.S. Environmental Protection Agency (EPA) as a National Priorities List (NPL or Superfund) site. The goal of the Superfund listing is to get contamination contained and cleaned up, and to compel parties responsible for the contamination to implement and pay for the cleanup.

For further information, explore the info below or visit the EPA’s North Basin Superfund webpage.

  • North Basin 2019 VOC plume map
  • Final North Basin Interim Remedy Feasibility Study (prepared by EPA)
  • Final North Basin RI Report Appendices (Excluding C, D, E, J, & M)
    • Final North Basin RI Report Appendix C
    • Final North Basin RI Report Appendix D
    • Final North Basin RI Report Appendix E
    • Final North Basin RI Report Appendix J
    • Final North Basin RI Report Appendix M
  • November 2025 Update
  • November 2025 Update (Spanish)
  • November 2025 Update (Vietnamese)
  • January 2025 Update (Spanish)
  • January 2025 Update (Vietnamese)
  • October 2024 Update
  • October 2024 Update (Spanish)
  • October 2024 Update (Vietnamese)
  • July 2024 Update
  • July 2024 Update (Spanish)
  • July 2024 Update (Vietnamese)
  • April 2024 Update
  • April 2024 Update (Spanish)
  • April 2024 Update (Vietnamese)

For items pertaining to the project, please search our meetings and agendas page or fill out a public records request.

18700 Ward Street, Fountain Valley, CA 92708

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