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Related Topics:
  • NPDES Permits Around the Nation
  • National Pollutant Discharge Elimination System (NPDES)
Contact Us

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.

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.

NPDES Permit Issuing Authorities in EPA's Pacific Southwest (Region 9)
State EPA-Issued Permits State-Issued Permits
Arizona
  • Arizona Tribal Lands
    (excluding Navajo Nation)
  • Arizona Department of Environmental Quality (AZDEQ)
    • Stormwater
 
Navajo Nation
  • Navajo Nation Lands
    (AZ, NM, UT)
 
California
  • California Tribal Lands
  • Additional EPA-Issued Permits
    (Other/Joint EPA and State)
  • California State Water Resources Control Board (SWRCB)
    • Regional Boards
      (Regional Boards issue NPDES permits for nine geographic areas of California)
    • Stormwater
Hawai'i
  • Hawai'i Permits
  • Hawai'i Department of Health's Clean Water Branch
    • Public Notices
    • Stormwater
Nevada
  • Nevada Permits
  • Nevada Bureau of Water Pollution Control
    • Public Notices
    • Stormwater
American Samoa
  • American Samoa Permits
  • American Samoa EPA
    (Does not issue NPDES permits)
Guam
  • Guam Permits
  • Guam EPA
    (Does not issue NPDES permits)
Commonwealth
of the
Northern Mariana
Islands (CNMI)
  • CNMI Permits
  • CNMI Bureau of Environmental and Coastal Quality (BECQ)
    (Does not issue NPDES permits)
Wake Island
  • Wake Island Permit
 

Public Notice

 
(Public Notices will appear here when available.)

Residual Designation Authority

Proposal for designating stormwater discharges from certain Commercial, Industrial and Institutional facilities in two Los Angeles Watersheds

Pacific Southwest Resources

NPDES Permits in EPA's Pacific Southwest
  • Arizona Tribal Lands (excluding Navajo Nation)
  • Navajo Nation Lands
    (AZ, NM, UT)
  • California Non-Tribal
  • California Tribal Lands
  • Hawai'i
  • Nevada
  • Pacific Island Territories
    • American Samoa
    • Guam
    • Commonwealth of Northern Mariana Islands (CNMI)
    • Wake Island
  • Stormwater Program
    • Improving Municipal Stormwater Program Monitoring, Evaluation, Tracking, and Reporting
  • Pretreatment Program
Contact EPA Region 9's NPDES Program Staff
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on December 21, 2022
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