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This list of stormwater-related events and workshops is compiled as a free service. Washington Stormwater Center does not promote, endorse, or otherwise recommend any of the companies, individuals, or organizations presented here.

Structural Stormwater Control - science update - Thursday, October 31

When Ecology reissued the 2019 Municipal Stormwater Permits, we committed to conducting a stakeholder process during the 2019-24 permit cycle related to the Phase I Structural Stormwater Control program. We are starting this process and sharing information on how to stay involved.


Background and context:

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. This permit requirement is an issue in the recent appeal of the Phase I and II permits.


We are taking a stepwise approach to the stakeholder process to inform the SSC program requirement for the 2024-2029 permit. We will begin by conducting a review of available scientific information about the relative environmental benefits of SSC project types. When the permit appeal process is complete, Ecology will convene a stakeholder group to take up the policy issues around this requirement. The stakeholder group will use the scientific information to review the structure and method for measuring the level of effort by permittees implementing SSC programs. We are confident this process can be completed in time to inform the 2024 permit requirements.


Upcoming opportunity:

The Stormwater Work Group (SWG) will develop the scope of work for the review of scientific information. In November 2018, Permittees asked the SWG to include this topic in the priorities for the next round of Stormwater Action Monitoring (SAM) projects. SAM is the regional monitoring program funded by municipal stormwater permittees in Western Washington.


Ecology is funding this project sooner to make the results more useful for informing the 2024 permit reissuance. We invite you to participate at SWG subgroup’s initial meeting to scope this project on Oct. 31. If you plan to participate, please RSVP to karen.dinicola@ecy.wa.gov or 360-407-6550 by COB 10/17/19 and let Karen know whether you plan to attend in person in Seattle or via webex. She will follow up with detailed information to everyone who RSVPs.


For more information:

More discussion about the review of scientific information will take place on Nov. 18 at the SWG meeting. The SWG subgroup will meet again in early December and in 2020 as needed.

You can follow SAM and SWG by subscribing to these listservs:

·         STORMWATER-WORK-GROUP meeting agendas, materials, and summaries of our meetings, and additional announcements related to our work.

·         STORMWATER-ACTION-MONITORING newsletter: you’ll receive three newsletters per year about SAM study findings and upcoming workshops;

·         SWG-REPORTER: four to five issues per year focused on study findings and the process for prioritizing and selecting studies (read the latest issue);


For those that cannot make the Oct. 31 meeting, Ecology will host a webinar Nov. 21 from 10-11:30 to share the information discussed. Webinar details will be sent out on this listserv soon.


If you have general questions about this process, please contact either Emma Trewhitt at emma.trewhitt@ecy.wa.gov or 360-407-7468  or Abbey Stockwell at abbey.stockwell@ecy.wa.gov or 360-407-7221.