Industrial Stormwater General Permit

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Submitting an application

We have transitioned to a modern work environment. To expedite application processing, please scan or take a photo of all permit forms and email them to our resource mailbox at: Also, you must mail the original, signed documents to:

Water Quality Program
PO Box 47696
Olympia, WA 98504-7696

We are currently emailing all coverage documents and permit related information 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

Permit reissuance

The current permit expires on Dec. 31, 2024. We have started the permit reissuance process and already completed intital stakeholder input. We will be planning a formal public comment period on the draft permit and formal public meetings and hearings. We plan to make a permit reissuance decision at the end of this process in December 2024.


Summer/Fall 2023: Gathered early input
Late Spring 2024: Formal public comment period on the draft permit
December 2024: Decision on reissuance
December 31, 2024: Current permit expires