Puget Sound Olympia

Municipal Stormwater

Phase II Western Washington Municipal Stormwater Permit

New item The 2014 Permit and Stormwater Manual Modification public comment period has CLOSED. Ecology is reviewing comments; see the modification page for the estimated completion date.

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 became effective on August 1, 2013.

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 to be effective through July 31, 2013. At the same time, Ecology also reissued an updated 2013 to 2018 permit on August 1, 2012.



Regional Stormwater Monitoring Program

Western Washington Phase II Timelines Overview - for continuing permittees

New Permittees WWA Phase II Timelines Overview - for new permittees under the 2013-2018 permit

2012 Municipal Stormwater Permit Appeals

2012 Permits Reissuance Process

Annual Report Forms and Guidance

Permit History