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. 


Current Annual Report and SWMP Plan:

The City must submit an Annual Report and Stormwater Management Program Plan to Ecology by March 31 of each year. 



Illicit Discharge Detection and Elimination:

The purpose of this section is to implement BMP's and specific IDDE programs to reduce the amount of pollution in the water. Utilizing field screening, citizen reports, and the spill hotline, the City actively works to contain, mitigate, and report all illicit discharges and connections. 


Public education, outreach, involvement, and participation: 

Kenmore's approach to stormwater is "Education First"--educating the public about potential water quality issues and common solutions is always the first approach. Along with various actives at public events and public outreach surveys, Kenmore tries to keep its public engaged and educated!


Pollution prevention operations and maintenance: 

The intent of the O&M policies are to help reduce stormwater impacts and pollutants in discharges from O&M activities. Maintenance standards, inspection schedules, and ongoing training help reduce the City's impact. 


Controlling runoff from new development and construction: 

Development standards and industry regulations are used to keep new development from further harming the environment. A large source of pollution in a growing city is from development and construction sites. Reducing impacts from new developments would greatly reduce water pollution. 


Swamp Creek Total Maximum Daily Load (TMDL): 

Due to historically high levels of bacteria in Swamp Creek, it was identified as a watershed that needs continuing monitoring. Watching the trends change and know the average values for Swamp Creek can help to gage its overall health and improvements. 

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: Tue, 05/29/2018 - 3:00pm