Phase I MS4 Permits
The Phase I MS4 Permits issued throughout the State are presented below by Regional Water Board.
Regional Water Boards
Region 1 – North Coast Water Board
- Phase 1 municipal stormwater permit for Cities of Santa Rosa, Cloverdale, Cotati, Healdsburg, Rohnert Park, Sebastopol, Ukiah, and Windsor, Sonoma County Water Agency and County of Sonoma – Order R1‑2015‑0030
- Additional information: North Coast Water Board’s NPDES Stormwater Web Page
Region 2 – San Francisco Bay Water Board
- Municipal Regional Stormwater NPDES Permit – Order R2-2022-0018 and Amendment R2-2023-0019
- Additional information: San Francisco Bay Water Board’s Stormwater Program web page.
Region 3 – Central Coast Water Board
- City of Salinas Municipal Stormwater Discharges – Order R3-2019-0073
- Additional information: Central Coast Water Board’s Stormwater Program web page.
Region 4 – Los Angeles Water Board
- Regional Phase I MS4 NPDES Permit ‒ Order R4-2021-0105 and Attachments A through S
- Additional information: Los Angeles Water Board’s Regional Permit Program Page
Region 5 – Central Valley Water Board
- Region-Wide MS4 Permit – Order R5-2016-0040
- Additional information: Central Valley Water Board’s Storm Water Program – MS4 Municipal Permits
Region 6 – Lahontan Water Board
- Lake Tahoe Municipal NPDES Storm Water ‒ R6T-2022-0046 Combined Order with Attachments A through H
- Additional Information: Lahontan Water Board’s Storm Water Program
Region 7 – Colorado River Water Board
- Discharges from MS4s within the Whitewater River Watershed – R7-2013-0011, Attachment B (program database), and Attachment D (certification statement)
- Additional Information: Colorado River Water Board’s Stormwater Program
Region 8 – Santa Ana Water Board
- Orange County MS4 Permit – Order R8-2009-0030 as amended by R8-2010-0062
- Riverside County MS4 permit – Order R8-2010-0033
- San Bernardino County MS4 Permit – Order R8-2010-0036
- Additional Information: Stormwater Program
Region 9 – San Diego Water Board
- Region-Wide MS4 Permit – Order R9-2013-0001 as amended by Orders R9-2015-0001 and R9-2015-0100
- Additional Information: Phase I Regional MS4 Program page
(Updated 4/3/24)
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- Subscribe to our "Storm Water Municipal Permitting Issues" list under the "Water Quality" section.
Storm Water Contacts
- State Water Resources Control Board
Storm Water Section
PO Box 1977
Sacramento, CA 95812-1977 - General Inquiries:
stormwater@waterboards.ca.gov
Toll Free: 1-(866)-563-3107 - State and Regional Board Contact Information
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- Report a Non-Filer - Let us know if a business does not have a Storm Water Permit.
- Report a QSD/QSP (Construction General Permit Qualified SWPPP Developer/Qualified SWPPP Practitioner)
