Industrial Stormwater General Permit
Coronavirus (COVID-19) status update
To expedite application processing please scan or take a photo of all forms and email them to us at email@example.com. When you are safe and able, please still mail us signed original documents.
We continue to process electronic permit related documents, but we may have extended turnaround times. Also, at this time, we're unable to print documents and may have to provide printed items at a later date. Until we're able to print, we will email coverage letters and other documents to the permittee on file.
If you have any questions, contact us at the email addresses below.
Stormwater can pick up pollution from factories and businesses. Those contaminants are carried into waterways and harm fish and other aquatic life. The Industrial Stormwater General Permit (ISGP) helps industrial facilities comply with federal regulations that reduce pollution. We require most industrial sites in Washington to monitor, measure, and reduce stormwater pollution leaving their site.
The current permit went into effect on Jan. 1, 2020 and expires Dec. 31, 2024.
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Current permit and related documents
Current applications and forms, and historic permit documents
For Permittees in the following cities and counties:
City of Seattle
Clark, Cowlitz, Grays Harbor, Jefferson, Lewis, Mason, Pacific, Skamania, Thurston, or Wahkiakum County
Pierce, Skagit, or Whatcom County
Benton, Island, King (except for Seattle), Kittitas, Klickitat, San Juan, or Yakima County
Adams, Asotin, Chelan, Clallam, Columbia, Douglas, Ferry, Franklin, Garfield, Grant, Kitsap, Lincoln, Okanogan, Pend Oreille, Snohomish, Spokane, Stevens, Walla Walla, or Whitman County
Industrial Stormwater General Permit Questions: