Construction Stormwater General Permit
Stormwater runoff from construction sites can carry muddy water, debris, and chemicals into local waterways. Sediments, chemicals, and debris can harm aquatic life and reduce water quality.
We require regulated construction sites to get coverage under the Construction Stormwater General Permit. Following the requirements in this permit helps control and reduce water pollution.
Operators of regulated construction sites are required to:
- Develop stormwater pollution-prevention plans.
- Implement sediment, erosion, and pollution-prevention control measures.
- Obtain coverage under this permit.
The current permit went into effect Jan. 1, 2021, and expires Dec. 31, 2025.
To receive updates about this permit, sign up for our email list.
Permit reissuance
We invited comments on the draft permit document from March 19 until May 9, 2025. We will publish a Response to Comments as an appendix to the fact sheet to address comments submitted during the public comment period. You can view the comments we recieved on our online comments site.
Supporting documents
- Fact sheet for the draft permit
- Small Business Economic Impact Analysis (SBEIA)
- Informational Presentation from the Public Hearing Meetings (April 2025)
- Washington State Register Public Notice of Draft (WSR 25-06-089, March 19, 2025)
Timeline
Spring 2024 - Winter 2025: Gather early input and begin redevelopment
March 19 - May 9, 2025: Formal public comment period on the draft permit
November 2025: Decision on permit issuance
Dec. 31, 2025: Current permit expires
I've got permit coverage. Now what?
Check out our eCoverage packet for more information about your requirements.
If you would like more information on the permit fee process, visit Water Quality permit fees webpage.
Need help implementing the permit?
What do I do with contaminated water?
See contaminated water on construction sites for guidance.
Related links
Contact information
Please find your county below to determine your Permit Administrator:
King (except city of Seattle)
Alyssa Brewer
564-669-4922
alyssa.brewer@ecy.wa.gov
City of Seattle, Chelan, Clallam, Douglas, Island, Jefferson, Kittitas, Pacific, San Juan, Skamania, Spokane, Whitman
Max Graham
564-200-2505
max.graham@ecy.wa.gov
Adams, Asotin, Benton, Columbia, Franklin, Garfield, Grant, Grays Harbor, Kitsap, Skagit, Thurston, Walla Walla
Jasper Sogn
360-972-6524
jasper.sogn@ecy.wa.gov
Cowlitz
Joyce Smith
360-628-2138
joyce.smith@ecy.wa.gov
Ferry, Lincoln, Mason, Okanogan, Pend Oreille, Snohomish, Stevens, Wahkiakum, Yakima
Collin Smith
564-669-9319
collin.smith@ecy.wa.gov
Clark, Lewis, Klickitat
Jen Smith
360-584-8214
Jen.smith@ecy.wa.gov
Pierce, Whatcom
Melinda Wilson
360-870-8290
melinda.wilson@ecy.wa.gov
Kendra Henderson
General Permit Writer
360-870-6757
kendra.henderson@ecy.wa.gov