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.
Find the types of facilities that require coverage under the ISGP in Table 1 of the current permit.
The current permit went into effect Jan. 2, 2015, and expires Dec. 31, 2019.
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The current permit expires on Dec. 31, 2019. We plan to reissue an updated general permit in Nov. 2019.
Our proposed changes to the permit include:
Public outreach and listening sessions: Fall 2018
Formal public comment period on the draft permit: Spring 2019
Issue final permit: Nov. 2019
Permit effective: Early 2020
We will answer questions and accept informal feedback on the proposed changes until Nov. 26, 2018.
Skagit, Snohomish, or Whatcom County
Island, King, or San Juan County
City of Seattle, Kitsap County
Clallam, Clark, Cowlitz, Grays Harbor, Jefferson, Lewis, Mason, Pacific, Skamania, or Wahkiakum counties
Pierce and Thurston counties