San Diego Region - Phase I 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.
Development of Proposed Changes to the Regional MS4 Permit
The San Diego Water Board has begun the development of proposed changes to the Regional MS4 Permit. The Regional MS4 Permit expired on June 27, 2018, but remains in effect under an administrative extension until it is reissued by the San Diego Water Board. On December 27, 2017, the Copermittees submitted a Report of Waste Discharge (ROWD) in application for NPDES permit reissuance of the Regional MS4 Permit. The ROWD summarizes the Copermittees' existing storm water programs and makes recommendations for updates and other modifications to the Regional MS4 Permit. The development process is estimated to take a year to complete. It is anticipated that the San Diego Water Board will adopt proposed changes to the Regional MS4 Permit in late 2019. The San Diego Water Board will hold public workshops on focus topics and the proposed changes to the Regional MS4 Permit.
Information and Notice Updates by Electronic Mail Subscription
The San Diego Water Board has established an electronic mail list specifically for information and notices on the development of proposed changes to the Regional MS4 Permit. The San Diego Water Board will use the email list to notify interested persons of upcoming important events and the availability of on-line documents. Persons interested in receiving future notices and information on this specific project can subscribe to one (1) of the electronic mail lists entitled "Orange County MS4 Permit," Riverside County MS4 Permit," or "San Diego MS4 Permit" located on the San Diego Water Board website at: http://www.waterboards.ca.gov/resources/email_subscriptions/reg9_subscribe.shtml
Incorporation of Integrated Planning Framework Approach into the Regional MS4 Permit
A public workshop was held on Thursday, November 8, 2018 from 10:00 a.m. to 12:00 at the San Diego Regional Water Quality Control Board, Board Meeting Room at:
2375 Northside Drive, Suite 100
San Diego, California 92108
Approximately 52 interested stakeholders attended. The public workshop was available by webcast during the discussion. The public notice below was sent out on October 8, 2018 on lyris list.
The agenda and Public Workshop presentations are included below:
Current Regional MS4 Permit
- Order No. R9-2013-0001, as amended by Order Nos. R9-2015-0001 and R9-2015-0100 (complete with Attachments)
- Order No. R9-2013-0001, as amended by Order Nos. R9-2015-0001 and R9-2015-0100 (Order only)
- Attachment A - Discharge Prohibitions and Special Protections
- Attachment B - Standard Permit Provisions and General Provisions
- Attachment C - Acronyms, Abbreviations, and Definitions
- Attachment D - Jurisdictional Runoff Management Program Annual Report Form
- Attachment E - Specific Provisions for Total Maximum Daily Loads
- Attachment F - Fact Sheet / Technical Report
Water Quality Improvement Plans
Statewide Trash Amendments
Water Quality Equivalence Guidance (WQE)
Pursuant to Provision E.3.c.(3) of Order No. R9-2013-0001, as amended, 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. On December 17, 2015, a final Water Quality Equivalency Guidance Document was accepted by the Executive Officer:
2015 Accepted Water Quality Equivalence Guidance
- Executive Officer Acceptance Letter
- Final Water Quality Equivalency Guidance Document
- Final Water Quality Equivalency Automated Calculation Worksheets
June 2018 Draft Water Quality Equivalence Guidance
Pursuant to provisions E.3.c.(3), E.3.d, and F.2.b of Order No. R9-2013-0001, as amended, the Copermittees submitted an update to the accepted 2015 WQE. The complete June 2018 Draft WQE is available for a 30-day public review and comment period. After public comments are received, the Copermittees will consider the comments and incorporate any changes made in response to the comments in a final updated WQE for acceptance by the Executive Officer. A redline version of proposed changes to the 2015 WQE are provided with the June 2018 Draft WQE. Interested persons wishing to submit comments on the June 2018 Draft WQE must submit them in writing no later than 5:00 p.m. on November 10, 2018.
Written comments should be submitted via email to:
Attn: Erica Ryan
Subject: PIN 786088, Comments - June 2018 Draft WQE
Questions pertaining to this matter can be addressed to Erica Ryan at Erica.Ryan@waterboards.ca.gov or (619) 521-8051.
June 2018 Draft Proposed Update to 2015 Water Quality Equivalence Guidance
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