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Department of Ecology
Committees, Boards, and Workgroups

Structural Stormwater Controls Stakeholder Process

Municipal Stormwater Permit Requirement: Structural Stormwater Controls

The Phase I Municipal Stormwater Permit includes a program requirement for Structural Stormwater Controls (SSC), which requires Permittees to prevent or reduce impacts to waters of the state caused by discharges from the MS4s. The SSC program is intended to address impacts not adequately controlled by other required actions of the permit. 

The permit describes 11 eligible project types that can be implemented to meet the SSC program requirement. Information on the SSC requirement and project types is in Appendix 12 of the Phase I permit.

For the first time, the 2019-2024 Phase I permit requires permittees to meet a minimum level of effort in implementing their SSC programs. 

 SSC Science Synthesis

We took a stepwise approach to the stakeholder process to inform the SSC program requirement for the 2024-2029 permit. We began by conducting a review of available scientific information about the relative environmental benefits of SSC project types. This resulted in the SSC Science Synthesis Report, which will inform the next phase of the stakeholder process: convening a Policy Advisory Committee to develop recommendations for the 2024 Permits.

 SSC Policy Advisory Committee

The SSC Policy Advisory Committee (SSC PAC) will use the SSC Science Synthesis to review the structure and method for measuring the level of effort by permittees implementing SSC programs. The SSC PAC will also develop recommendations regarding a proposed approach for a retrofit requirement for the WWA Phase II permit.


Contact Abbey Stockwell at abbey.stockwell@ecy.wa.gov with any questions.

Upcoming Events

SSC PAC Meetings

Meeting agendas will be posted below in "Documents" closer to meeting dates

May 31, 2022 1-4 pm

Join Zoom Meeting

Meeting ID: 851 8925 9487
Passcode: 943282

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July 6, 2022 9am-12

Past Events

May 5, 2022 SSC PAC Meeting #1

Structural Stormwater Control Informational Seminar
Feb. 8, 2022 1 to 4 p.m.
On Feb. 8, we hosted an informational seminar on the current Structural Stormwater Control Program (SSC) in the Phase I Municipal Stormwater Permit as well as similar capital programs implemented by Western Washington Phase II Permittees. This seminar will inform the future discussions of the Policy Advisory Committee on the SSC Program.



 File NameFile SizeDescriptionCategoryDate Added
Agenda May 31 2022.docx 12.4 KB 5/31/2022 PAC Agenda
5/31/2022 PAC Agenda
#NEW_CATEGORY# 05/24/22 03:57 PM
5.5.22PACNotes_Draft.docx 64 KB 5/5/2022 PAC Notes
5/5/2022 PAC Notes
Word Doc 05/24/22 03:49 PM
SSCPAC5.5.22Final.pdf 1.8 MB 5/5/2022 PAC presentation
5/5/2022 PAC presentation
Presentations 05/09/22 02:19 PM
SSCPAC5.5.22_JNelson.pdf 243.6 KB Jim Nelson's PPT from May 5th Meeting
Jim Nelson's PPT from May 5th Meeting
Presentations 05/06/22 10:53 AM
5.5.22PACAgenda.pdf 168.7 KB 5/5/2022 PAC agenda
5/5/2022 PAC agenda
#NEW_CATEGORY# 05/02/22 09:40 AM
SSC.History.Seminar.2.8.22.pdf 1.9 MB Feb 8, 2022 SSC Seminar presentation
Feb 8, 2022 SSC Seminar presentation
None 04/21/22 10:20 AM
Nov 21 SSC webinar.notes.pptx 3.6 MB Introduction to the SSC Process
Introduction to the SSC Process
Presentations 11/25/19 10:06 AM

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