Contact EPA Pacific Southwest Water Division
Pacific Southwest, Region 9
Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations
Water Quality Standards
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National Links
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State, Tribe and Territory Programs
On this page:
The following States in Region 9 have approved Water Quality Standards
Arizona
- Department of Environmental Quality
- Water Quality Standards
- EPA Repository of WQS Documents
- Biological Indicators
California
- State Water Resources Control Board
- Regional Boards
- 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
- State Department of Health Environmental Planning Office
- Water Quality Standards Maps
- EPA Repository of WQS Documents
- Biological Indicators
Nevada
- Bureau of Water Pollution Control
- Water Quality Standards
- EPA Repository of WQS Documents
The following Tribes in Region 9 have approved Water Quality Standards
White Mountain Apache Tribe
- Tribal Government
- Water Quality Standards (PDF) (55 pp, 4.3MB)
Hoopa Valley Indian Tribe
Hualapai
- Tribal Information
- Water Quality Standards *not available yet*
Biological Indicators of the Pyramid Lake Pauite Tribe (not yet approved)
The following Territories in Region 9 have approved Water Quality Standards
American Samoa
- Water Quality Standards (PDF) - (41 pp, 153K) revised 1999
- Biological Indicators
Guam
- Water Quality Standards (PDF) - (132 pp, 3.6MB) revised 2001
Commonwealth of the Northern Marianas Islands
- Water Quality Standards (PDF) (43 pp, 1.2 M)
- Biological Indicators