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EPA Region 9 (Pacific Southwest)

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EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, Pacific Islands, and 148 Tribal Nations.
Map of region 9

Alert
Alert Super Typhoon Sinlaku Response

In response to Super Typhoon Sinlaku, EPA has received a mission assignment from the Federal Emergency Management Agency. EPA water specialists are on the ground in Guam and the Northern Marianas. EPA has completed assessments of available drinking water systems on CNMI, and the agency is collaborating with local authorities to restore safe, reliable drinking water as quickly as possible. EPA is providing scientific support to agencies tasked with ensuring safe water is available across Saipan; this work includes sampling restaurant drinking water and evaluating drinking water at emergency shelters.

Boil water notices remain in effect for parts of Saipan, Tinian, and Rota. Bottled water is available at shelters and community sites, and public filling stations are open in Saipan. Tinian, and Rota. Bottled water is available at shelters and community sites, and public filling stations are open in Saipan.

More Information:
  • Commonwealth of the Northern Mariana Islands (CNMI)
  • CNMI – Facebook
  • U.S. Army Corps of Engineers – Facebook
  • Guam Department of Public Health and Social Services – Facebook
  • CNMI Division of Environmental Quality – Facebook

Current Key Issues

  • Moss Landing Fire Response
  • Tijuana River Cross-Border Watershed
  • Response to 2025 Los Angeles Wildfires
  • Navajo Nation Abandoned Uranium Mines
  • Red Hill Fuel Storage Facility

Public Notices and Engagement

When EPA’s Pacific Southwest Region hosts public meetings, events, or other opportunities for public participation, they will be found here.

Newsletters

A quarterly newsletter covering EPA activities and stories of interest. 

Popular Topics

  • Air Permits
  • Air Quality Plans
  • Brownfields
  • Children's Health
  • Grants
  • Laboratory Services
  • Lake Tahoe
  • Marine Protection Permitting
  • Maui Wildfires
  • NPDES Wastewater Permits
  • Polychlorinated Biphenyls (PCBs)
  • Public Notices, Meetings & Events
  • Quality of Environmental Data
  • San Francisco Bay Delta
  • San Joaquin Valley
  • Superfund Sites
  • Tribal Programs
  • Underground Injection Control (UIC)
  • U.S.-Mexico Border
  • West Coast Collaborative

News Releases

  • EPA Takes Action Against Two Northern California Landfills for Clean Air Act Violations, Minimizing Harmful Emissions

  • EPA Recognizes Excellence and Innovation in Bay Area and San Diego Area Water Infrastructure Projects

  • EPA Announces $34 Million WIFIA Loan to Improve Stormwater Management in San Mateo County, California

  • EPA Concludes Drinking Water Has Been Free of Fuel Contamination Since 2022, in Wake of Red Hill Release

  • EPA Determines Phoenix-Mesa Area Will Not Be Unfairly Punished for International Emissions

  • EPA Proposes Plan to Step Up Groundwater Cleanup at San Fernando Valley Superfund Site, Increasing Supply of Safe Drinking Water


Subscribe to News Releases
(Under “All Topics” click on News Releases, then check the box next to Pacific Southwest Region)

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Last updated on May 1, 2026
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