In sign of progress in Superfund cleanups across Pacific Southwest, EPA to perform Five-Year Reviews at 27 Superfund sites in 2025
SAN FRANCISCO (Feb. 20, 2025) – In an important marker of progress achieved on long-term Superfund cleanups across the Pacific Southwest region, in 2025 the U.S. Environmental Protection Agency (EPA) will perform comprehensive Five-Year Reviews of cleanups at 27 Superfund sites across Arizona, California, Hawaii and Nevada. EPA will undertake these legally required reviews to ensure that cleanup efforts, some of which were completed years ago, continue to be protective of public health and the environment.
“Reviewing the long-term, complex cleanup work at these Superfund sites is critical to ensuring that public health and the environment will continue to be protected,” said EPA Pacific Southwest Superfund and Emergency Management Director Michael Montgomery. “Cleanups at these sites also promote redevelopment, providing communities with the opportunity for a variety of reuse options.”
Once the Five-Year Reviews are complete, the findings will be posted to each Superfund site’s webpage. The reviews to be completed in 2025 are:
Arizona:
- Mountain View Mobile Home Estates, Globe, Ariz.
- Nineteenth Avenue Landfill, Phoenix, Ariz.
- Phoenix-Goodyear Airport Area, Goodyear, Ariz.
- Yuma Marine Corps Air Station, Yuma, Ariz.
California:
- Applied Materials, Santa Clara, Calif.
- Casmalia Resources, Casmalia, Calif.
- CTS Printex, Inc., Mountain View, Calif.
- Del Amo, Los Angeles, Calif.
- Fresno Municipal Sanitary Landfill, Fresno, Calif.
- Hewlett-Packard (620-640 Page Mill Road), Palo Alto, Calif.
- Intersil Inc./Siemens Components, Cupertino, Calif.
- J.H. Baxter & Co., Weed, Calif.
- Liquid Gold Oil Corp., Richmond, Calif.
- Lorentz Barrel & Drum Co., San Jose, Calif.
- Mather Air Force Base (AC&W Disposal Site), Mather, Calif.
- Moffett Field Naval Air Station, Moffett Field, Calif.
- Montrose Chemical Corp., Torrance, Calif.
- Norton Air Force Base (Landfill 2), San Bernardino, Calif.
- Operating Industries, Inc., Landfill, Monterey Park, Calif.
- Pemaco Maywood, Maywood, Calif.
- Rockets, Fireworks, and Flares Site, Rialto, Calif.
- Southern California Edison Co. (Visalia Pole Yard), Visalia, Calif.
- South Bay Asbestos Area, Alviso, Calif.
- Tracy Defense Depot (USARMY), Tracy, Calif.
Hawaii:
- Del Monte Corp. (Oahu Plantation), Kunia, Hawaii
- Naval Computer and Telecommunications Area Master Station Eastern Pacific, Wahiawa, Hawaii
Nevada:
- Anaconda Copper Mine, Yerington, Nev.
Background
Throughout the process of designing and constructing a Superfund cleanup (also called a remedy) at a hazardous waste site, EPA's primary goal is to make sure the remedy will be protective of public health and the environment. After the remedy has begun to move forward, EPA continues to ensure it remains protective by requiring reviews of cleanups every five years. It is important for EPA to regularly check on these sites to ensure the remedy is working properly. These reviews identify issues (if any) that may affect the protectiveness of the constructed remedy and, if necessary, recommend action(s) necessary to address them.
There are many phases of the Superfund cleanup process, including considering future use and redevelopment of sites as well as conducting post cleanup monitoring of sites. EPA must ensure that any redevelopment will uphold the protectiveness of the remedy into the future.
More information:
The Superfund program, a federal program established by Congress in 1980, investigates and cleans up the most complex, uncontrolled or abandoned hazardous waste sites in the country and endeavors to facilitate activities to return them to productive use. In total, there are 140 Superfund sites (this includes sites currently on the National Priorities List, deleted sites, and sites under the Superfund Alternative Approach program) across EPA’s Pacific Southwest Region.
Learn more about Superfund and other cleanup sites in the Pacific Southwest.
Learn more about EPA's Superfund program.
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