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Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Water Quality Standards

Water Quality Quick Finder
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State, Tribe and Territory Programs

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The following States in Region 9 have approved Water Quality Standards

Arizona
California
  • State Water Resources Control Board
  • Regional Boards  Exiting EPA (disclaimer)- Regional Boards issue NPDES permits for 9 geographic areas of California. 
  • EPA Repository of WQS Documents
  • Biological Indicators
  • California Toxics Rule - Water Quality Criteria for Priority Toxic Pollutants for California Inland Surface Waters, Enclosed Bays and Estuaries
  • Policy for Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California (SIP) 
Hawai'i
Nevada

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The following Tribes in Region 9 have approved Water Quality Standards

White Mountain Apache Tribe
Hoopa Valley Indian Tribe
Hualapai  Exiting EPA (disclaimer)

Biological Indicators of the Pyramid Lake Pauite Tribe (not yet approved)

The following Territories in Region 9 have approved Water Quality Standards

American Samoa
Guam
Commonwealth of the Northern Marianas Islands

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