Phase II Western Washington Municipal Stormwater Permit

The EPA phase II regulations went into effect in early 2003 and apply to all regulated small municipal separate storm sewer systems. On January 17, 2007 Ecology issued two phase II municipal stormwater permits, one for western Washington and one for eastern Washington. The Phase II permit for western Washington covers at least 80 cities and portions of five counties with an effective date of February 16, 2007. Ecology modified the permit on June 17, 2009 to implement the outcomes of appeals. July 17, 2009 is the effective date for permit modifications.

updated Western Washington Phase II Permit

Issued January 17, 2007, Modified June 17, 2009

Unless otherwise specified, documents are available in Adobe Acrobat (.PDF file) format. To view and/or print PDF files, you first will need to download and install Adobe Acrobat Reader from this link.

updated Permit Modification

Includes the draft permit modification and comment letters for Ecology’s process to modify the permits from March 18, 2009 to June 17, 2009

Developing Low Impact Development (LID) Standards

Permit History

Previous permit documents (2007 and 1995)

Annual Reports Guidance

updated WWA Permit Timelines Overview

Permittee Annual Reports

Ecology posts annual reports for permittees that do not have a website.

Permittee Resources and Guidance

Workshop Information

2009 Notice of Issuance: Western Washington Phase II Municipal Stormwater General Permit

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 Last updated June 2009