National Pollutant Discharge Elimination System - Phase II Permit

The issued National Pollutant Discharge Elimination System and State Waste Discharge General Permit for Discharges from Small Municipal Separate Storm Sewers in Western Washington, hereafter referred to as the Phase II Permit, outlines stormwater program activities and implementation milestones that permittees must follow to comply with the federal Clean Water Act. 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 (i.e. 2007-2011), and submit annual reports to Ecology by March 31 each year to document progress toward complete program implementation.


The current Phase II permit was issued by the Department of Ecology (Ecology) on August 1, 2012, and became effective on August 1, 2013. The permit covers a five-year period that expires on July 31, 2018. While the actual dates of the permit run from August 1 to July 31 of the next year, the reporting requirements cover a calendar year from January 1 to December 31.


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. Urbanized areas are defined as population centers with greater than 50,000 people and densities of at least 1,000 people per square mile, and are based on the 2000 census. For future permits, the urbanized area will be based on the most recent federal census.


Ecology also can designate entities with a population of 10,000 or more that are located outside of urbanized areas as additional permittees. Designation criteria can include considerations such as discharge to sensitive waters, high population density, high growth or growth potential, contiguity to an urbanized area, significant contribution of pollutants to waters of the US, or ineffective protection of water quality by other programs. The City of Kenmore has been designated by Ecology as a Phase II permittee based on the current population of 19,200 and location within the Greater Seattle urbanized area, on the northern side of Lake Washington.


The City of Kenmore incorporated in 1998 from King County. During its initial year as a city, Kenmore established a storm drainage and surface water management utility to provide for the future operation of stormwater management activities. Most of its initial code and regulations were adopted directly from King County upon incorporation. The City adopted a Stormwater Management Plan and completed its first Comprehensive Plan in 2001. In November of 2008, the City adopted an updated Stormwater Management Plan that is consistent with the Phase II Permit requirements.


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: Wed, 09/06/2017 - 10:02am