Water Quality > Stormwater > Municipal Stormwater General Permit
Municipal Stormwater General Permit Information
Help and guidance, organized by the sections of the permits.
Additional resources for permittees, such as training and grants.
Keeping pollutants out of municipal water systems
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.
Many urban areas that collect stormwater runoff in municipal separate storm sewer systems (MS4s) are required to have a permit under the federal Clean Water Act.
The Environmental Protection Agency (EPA) stormwater regulations established two phases — Phase I (for medium and large MS4s) and Phase II (for smaller MS4s) — for the municipal stormwater permit program. (See our Municipal Stormwater Permittee Lists for a listing of the permittees covered by the Municipal Stormwater Permits.)
In Washington State, the Department of Ecology develops and administers National Pollutant Discharge Elimination System (NPDES - a section of the Clean Water Act) municipal stormwater permits.
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