Stormwater Regulations, Reports and Plans

Stormwater Regulations

On May 8, 2013, the San Diego Regional Water Quality Control Board (Regional Board) adopted a new Municipal Separate Storm Sewer System (MS4/Stormwater) Permit (National Pollution Discharge Elimination System Permit, No. R9-2013-0001) that 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.  Order No. R9-2015-0100 was adopted on November 18, 2015, amending the Regional MS4 Permit to extend coverage to the Riverside County Copermittees and make minor revisions.  This Permit mandates that the County of San Diego develop new and updated Runoff Management Plans and Programs, including Water Quality Improvement Plans and a Jurisdictional Runoff Management Program.  These documents were submitted to the Regional Board on June 26, 2015.  Permit requirements are generally implemented in the unincorporated County under authority of the Watershed Protection, Stormwater Management, and Discharge Control Ordinance (WPO).

The amended MS4 Permit, like all previous iterations, requires the County to establish and maintain adequate legal authority to implement all updated MS4 Permit provisions.  The WPO has been amended to ensure that it is current with the minimum requirements of the recently amended MS4 Permit.  The amendments include updating terminology and definitions related to land development priority development projects (PDPs), removal of outdated sections, minor updates to discharge prohibitions, and the incorporation of an optional program to allow development projects to satisfy some of its stormwater compliance obligations at off-site locations.

On January 27, 2016 the County Board of Supervisor’s adopted the Watershed Protection, Stormwater Management, and Discharge Control Ordinance (WPO). The WPO became effective February 26, 2016. 

Watershed Protection Ordinance

 

Stormwater (MS4) Permit, Reports and Plans

  • Water Quality Improvement Plans - Submitted to the Regional Water Quality Control Board on September 29, 2015.  These plans outline how the County will improve water quality in the region. 

 

Other State Water Resources Control Board Permits

 

Manuals & Resources

  • 2019 Best Management Practice Design Manual - The new 2019 manual has been posted! For land development and public improvement projects, this manual focuses on project design requirements and related post-construction requirements.