Washington Department of Ecology administers federally-required NPDES stormwater permits statewide, setting minimum standards for municipal, construction, and industrial stormwater that all jurisdictions must implement.
Under RCW 90.48 (Water Pollution Control Act) and the federal Clean Water Act, the Washington State Department of Ecology issues NPDES Phase I and Phase II Municipal Stormwater Permits, the Construction Stormwater General Permit, and the Industrial Stormwater General Permit. Construction sites disturbing one or more acres require coverage and a Stormwater Pollution Prevention Plan (SWPPP). Permittee cities and counties must adopt and enforce stormwater management programs meeting the Stormwater Management Manual for Western or Eastern Washington. Local jurisdictions may impose stricter requirements but cannot weaken state minimums.
Discharging pollutants without a permit or violating permit conditions can result in civil penalties up to $10,000 per day per violation under RCW 90.48.144, and potential criminal charges for knowing violations.
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