NPDES Permits in EPA’s Pacific Southwest (Region 9)
EPA's Pacific Southwest (Region 9) issues National Pollutant Discharge Elimination System (NPDES) permits for wastewater, industrial, and stormwater discharges on Tribal lands in Arizona, California, Nevada, and Navajo Nation Lands; for discharges in the U.S. Pacific Island territories of Guam, American Samoa, and the Commonwealth of the Northern Mariana Islands; and any discharges into federal ocean waters.
EPA’s Pretreatment Program regulates discharges of nondomestic wastewater to publicly owned treatment works (POTWs), in order to prevent discharge of pollutants that could interfere with POTW operations or pass through into receiving waters.
Municipalities subject to the stormwater regulations are evaluated to determine compliance with MS4 permits. See Region 9's MS4 Program Audit Reports.
Residual Designation Authority
Learn more about the proposal for designating stormwater discharges from certain commercial, industrial and institutional facilities in two Los Angeles watersheds.
Who Issues NPDES Permits in EPA's Pacific Southwest?
Arizona, California, Hawai'i, and Nevada issue NPDES permits for discharges on lands (other than Tribal lands) within those states. State-issued permits and related information are accessible through state program websites. See table below.
State | EPA-Issued Permits | State-Issued Permits |
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Arizona |
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Navajo Nation |
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California |
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Hawai'i | ||
Nevada | ||
American Samoa |
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Guam |
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Commonwealth of the Northern Mariana Islands (CNMI) |
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Wake Island |
Public Notice
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EPA 301(h) Waiver Tentative Decision Document and Consolidated EPA and State Draft NPDES Permit for The City of San Diego E.W. Blom Point Loma Wastewater Treatment Plant
EPA Region 9 and the California Regional Water Quality Control Board, San Diego Region are jointly releasing a Tentative NPDES Permit for the City of San Diego’s Point Loma Wastewater Treatment Plant. This includes a waiver request from secondary treatment
- Comments Due Date:
- Geographic Locations: Southwest, California
EPA Pacific Southwest Resources
- Arizona Tribal Lands (excluding Navajo Nation)
- Navajo Nation Lands
(AZ, NM, UT) - California Non-Tribal
- California Tribal Lands
- Hawai'i
- Nevada
- Pacific Island Territories
- Stormwater Program
- Pretreatment Program