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NPDES Phase II Permit

The National Pollutant Discharge and Elimination System (NPDES) is a federal permit governing stormwater. The Phase II Permit applies to cities with populations less than 100,000 located within or partially within, an urbanized area and that operate a municipal separate storm sewer system (MS4) which discharges to a water of Washington State. It outlines stormwater program activities and implementation milestones that permittees must follow to comply with the federal Clean Water Act, enforced in Washington State by the Department of Ecology. The current permit cycle is from 2013-2018 with an addendum for 2018-2019, to extend the drafting period for the 2019-2024 permit. 
The Western Washington NPDES Phase II Permit governs over 80 cities, including Kenmore. The Permit authorizes the discharge of stormwater runoff from municipal stormwater systems into the state’s surface waters (i.e., streams, rivers, lakes, Puget Sound, wetlands, etc.) and groundwater as long as municipalities implement Permit-specified actions and activities known as Best Management Practices (BMPs) to protect these receiving waters. All Phase II communities are expected to develop a Stormwater Management Program (SWMP) that includes all the required activities, implement those activities within the required timeframes of the permit term. 


The SWMP specifically outlines actions that Kenmore will take to actively implement permit requirements:

Illicit Discharge Detection and Elimination

Public education, outreach, involvement, and participation

Pollution prevention operations and maintenance 

Controlling runoff from new development and construction

Swamp Creek Total Maximum Daily Load (TMDL)

The City encourages its citizens to provide feedback, comments or questions about the NPDES program or any of the annual report documents.  Please contact Richard Sawyer at or call 425-984-6153.
Last updated: Thu, 02/15/2018 - 11:59am