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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.
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Alert
Alert Super Typhoon Sinlaku Response

In response to Super Typhoon Sinlaku, EPA received a mission assignment from the Federal Emergency Management Agency (FEMA) on April 17, 2026, to ensure the safety of drinking water and to coordinate and assess needs for wastewater facilities in CNMI. EPA concluded its field operations on May 7, 2026.

EPA completed assessments of available drinking water systems on Saipan, Tinian, and Rota, and worked with local authorities to restore safe, reliable drinking water as quickly as possible. EPA provided scientific support to local agencies tasked with ensuring safe drinking water is available across Saipan; this work included sampling drinking water at restaurants, shelters, schools, drinking water purveyors, and temporary drinking water treatment locations.

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

More Information:
  • EPA’s Response to Super Typhoon Sinlaku
  • Commonwealth of the Northern Mariana Islands (CNMI)
  • CNMI – 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
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  • Brownfields
  • Children's Health
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  • Laboratory Services
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  • Marine Protection Permitting
  • Maui Wildfires
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  • 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 Announces $9.5 Million for Hawaii to Address PFAS in Drinking Water

  • EPA Announces $9.5 Million for Nevada to Address PFAS in Drinking Water

  • EPA Announces $9.5 Million for Northern Mariana Islands to Address PFAS in Drinking Water

  • EPA’s Eaton Fire Soil Sampling Confirms Federal Cleanup Protocols Effectively Remediated Burn Debris Contamination

  • EPA Announces $9.5 Million for Guam to Address PFAS in Drinking Water

  • EPA Announces $77.3 Million for California to Address PFAS in 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 8, 2026
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