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. Ecology first issued the Western Washington Phase II permit in 2007 and modified it in 2009. Ecology reissued it unmodified on August 1, 2012 at legislative direction to be effective through July 31, 2013. After an extensive public process, Ecology also reissued the updated 2013 to 2018 permit on August 1, 2012.
The Phase II permit for western Washington covers at least 80 cities and portions of five counties with an effective date of September 1, 2012. The updated 2013-2018 permit will become effective on August 1, 2013.
Regional Stormwater Monitoring Program
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