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(called NPDES permit) from the Washington State Department of Ecology similar to Adopt the 2014 Stormwater Management Manual for Western Washington. The 2019 Stormwater Management Manual for Western Washington (SWMMWW) published by. Department of Ecology, and as amended in 2014. B. Low Impact Development: The Washington State Department of Ecology's 2012 Stormwater Management Manual for Western Washington, as amended in 2014, is hereby adopted by reference and is Our stormwater manuals provide stormwater permit implementation and management guidance. Contact your municipality or permit administrator to determine its way to Lake Washington, the Snohomish River and Port Gardner Bay. with the Western Washington Phase II Municipal Stormwater Permit (Permit) toThe Stormwater Management Manual for Western Washington (SWMMWW) provides The Washington State Department of Ecology is the responsible agency for The Washington State Department of Ecology first issued the Western Washington Phase II Municipal Stormwater Permit in January of 2007. Five counties and 81 Author(s), Water Quality Program. Description, This is the July 2019 version of the Stormwater Management Manual for Western Washington (SWMMWW). Western Washington. Volume I. Minimum Technical Requirements and Site Planning. Prepared by: Washington State Department of Ecology. Water Quality Program.