San Diego Region - San Diego County Municipal Storm Water Permit

REGIONAL MS4 PERMIT

The San Diego Water Board regulates discharges from Phase I municipal separate storm sewer systems (MS4s) in the San Diego Region under the Regional MS4 Permit. The Regional MS4 Permit covers 39 municipal, county government, and special district entities (referred to jointly as Copermittees) located in San Diego County, southern Orange County, and southwestern Riverside County who own and operate large MS4s which discharge storm water (wet weather) runoff and non-storm water (dry weather) runoff to surface waters throughout the San Diego Region. The Regional MS4 Permit, Order No. R9-2013-0001, was adopted on May 8, 2013 and initially covered the San Diego County Copermittees. Order No. R9-2015-0001 was adopted on February 11, 2015, amending the Regional MS4 Permit to extend coverage to the Orange County Copermittees. Finally, Order No. R9-2015-0100 was adopted on November 18, 2015, amending the Regional MS4 Permit to extend coverage to the Riverside County Copermittees.

CURRENT REGIONAL MS4 PERMIT

WATER QUALITY IMPROVEMENT PLANS

IMPLEMENTATION OF THE STATEWIDE TRASH AMENDMENTS

REGIONAL CLEARINGHOUSE

WATER QUALITY EQUIVALENCE GUIDANCE

Pursuant to Provision E.3.c.(3) of Order No. R9-2013-0001, as amended by Order Nos. R9-2015-0001and R9-2015-0100, each Copermittee may be allowed to implement an Alternative Compliance Program within its jurisdiction which would allow Priority Development Projects to implement all or part of the structural storm water pollutant control and/or hydromodification management BMPs offsite instead of fully onsite. Pursuant to Provision E.3.c.(3)(a), the San Diego Water Board's Executive Officer must accept Water Quality Equivalency calculations before an Alternative Compliance Program may be implemented by a Copermittee within its jurisdiction. A final Water Quality Equivalency Guidance Document has been accepted by the Executive Officer, available below:

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  (Page last updated 7/31/18)