We develop and administer Clean Water Act National Pollutant Discharge Elimination System (NPDES) municipal stormwater permits in Washington. The permit requires local governments to manage and control polluted stormwater runoff so that it does not pollute downstream waters.
The Eastern Washington Phase II Municipal Stormwater Permit covers 18 cities and portions of six counties. Find a list of cities and counties covered by this permit.
The current permit went into effect Aug. 1, 2014 and expires July 31, 2019. We are in the process of re-issuing this permit.