Water Quality > Stormwater > Municipal Stormwater General Permit
Municipal Stormwater General Permits
Urban areas that collect stormwater runoff in municipal separate storm sewers (MS4s) and discharge it to surface waters are required to have a permit under the federal Clean Water Act.
The Environmental Protection Agency (EPA) stormwater regulations established two phases--Phase I and Phase II--for the municipal stormwater permit program. (See our Municipal Stormwater Permittee Lists for a listing of the permittees covered by the Municipal Stormwater Permits.)
The Department of Ecology develops and administers National Pollutant Discharge Elimination System (NPDES) municipal stormwater permits in Washington State.
The Municipal General Permit stormwater program requirements include the following:
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