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  2. EPA in California

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
    • 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 8, 2025
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