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  2. EPA in California

EPA in California: Topics and Resources

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

Additional Resources

  • About EPA in the Pacific Southwest
  • Laboratory Services
  • Library Services
  • EPA News Releases
  • Public Notices, Meetings and Events
  • Report a Violation
  • Today's Air Quality
  • California Air Resources Board (CARB)
  • California Environmental Protection Agency (CalEPA)
  • California Natural Resources Agency

Air

  • Approved Air Quality Implementation Plans
  • Clean Air Act Permitting in California
  • California Clean Air Technology Initiative (CATI)
  • Desert View Power
  • West Coast Collaborative: Partnering to Reduce Diesel Emissions
    A public-private partnership committed to reducing diesel emissions and advancing clean technologies.

Land

  • Bay Road Holdings LLC (formerly Romic Environmental Technologies Corporation)
  • Brownfields
  • California Bioresources Alliance Symposia
  • Central Metal Site Investigation
  • Chemical Waste Management Inc. Kettleman Hills Facility
  • Chiquita Canyon Landfill
  • Cleanup Sites
  • Former Exide Battery Recycling Facility
  • San Joaquin Valley
  • West Oakland Collaborative

Tribal

  • Green Building Tools for Tribes
  • Tribal Programs in the Pacific Southwest
    • Tribal Air Program
    • Tribal Water Program
    • Federally Recognized Tribes
    • GAP Funding
    • Newsletters
    • RTOC
    • Tribal Consultation

U.S.-Mexico Border

  • U.S.-Mexico Border Program (Border 2025)

Water

  • Bay Road Holdings LLC (formerly Romic Environmental Technologies Corporation)
  • Havasu Water Company Public Water System
  • Impaired Waters and TMDLs
  • Lake Tahoe
  • NPDES Permits in California
  • Oasis Mobile Home Park
  • San Francisco Bay Delta Watershed
  • San Francisco Bay Program Office
  • Southern California Ocean Disposal Site #2 Investigation
  • Underground Injection Control (UIC) Permits
  • Water Reuse and Recycling

EPA in California

  • Topics and Resources
    • Bay Road Holdings LLC (Romic)
    • California Bioresources Alliance Symposia
      • 2024
      • 2023
      • 2022
      • 2021
      • 2020
      • 2019
      • 2018
      • 2017
      • 2016
    • California Clean Air Technology Initiative
    • Central Metal Site Investigation
      • Frequently Asked Questions (FAQs)
      • Investigación del sitio de Central Metal
      • Preguntas Frecuentes
    • Chiquita Canyon Landfill
    • Desert View Power
    • Former Exide Battery Recycling Facility
      • En español
      • Archived Updates
    • Havasu Water Company
    • Kettleman Hills
      • Permit and Supporting Documents
    • San Fernando Valley Superfund Sites
    • San Joaquin Valley
    • San Francisco Bay Delta Watershed
    • Southern California Ocean Disposal Site Investigation
    • Tijuana River Valley Water and Odor Issues
    • U.S.-Mexico Border Program (Border 2025)
    • West Oakland Collaborative
    • EPA Staging Areas
Contact Us about EPA in California
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on May 28, 2025
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