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11930 Cyrus Way
Mukilteo, WA 98275
Phone: 425.263.8000

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 / Public Works / Storm/Surface Water Program / SWMP and NPDES


Annual Stormwater Management Program (SWMP) Plan
The Utility’s storm water management program provides for a number of essential storm water related activities, including a comprehensive facility maintenance plan (sweeping City streets, cleaning catch basins and detention facilities), a public education and outreach component, inspection of commercial and multifamily housing sites for proper operation and maintenance of storm water treatment and control facilities, identification of illicit discharges to the storm water system, and spill cleanup response for accidental discharges.

The city is required to prepare an annual SWMP Plan which provides a summary of the city’s program plans for the upcoming year.

This SWMP document is intended to be used in three different ways. First, it will assist Washington State Department of Ecology's municipal stormwater staff in gaining a better understanding of the city’s planned activities and document efforts to achieve permit compliance. Second, it informs the public of the city’s stormwater management plans and activities and is used to solicit questions and input from the public. Finally, since this document brings together many elements of the city’s stormwater activities, it is used by City staff to clarify the current status of the SWMP and help focus the daily activities to maintain the system and ensure compliance with NPDES permit requirements.

This SWMP document is not a legal document. Instead, the components and actions described in the document are enforced through other adopted regulations, such as the NPDES permit and the City’s Municipal Code and Stormwater Ordinances.

2015 - Surface Water Management Program
2013 - 2014 Surface Water Management Program
2012 Surface Water Management Program

National Pollution Discharge Elimination System (NPDES)
The Washington State Department of Ecology (Ecology) issued the NPDES Permit in January 2007 as part of its implementation of the federal Clean Water Act. The permit covers a 5-year period from February 16, 2007, to February 15, 2012. Ecology will likely issue another permit after this one expires.  Requirement deadlines are spread throughout the permit period.

The permit outlines requirements to protect the water quality in natural receiving waters (streams, lakes, wetlands, etc.) from municipal separate storm sewer discharges. The NPDES Municipal Stormwater Permit program is separated into two different phases. Phase I applies to “large” and “medium” size cities and counties (populations greater than 100,000). Phase II applies to all other cities, towns, or counties owning or operating a municipal separate storm sewer system. The Mukilteo is a Phase II permittee.
The permit requires the city to submit an annual report that summarizes the city’s stormwater activities for the previous calendar year. The annual SWMP report is a required attachment to the annual NPDES report. A copy of the annual NPDES report can be obtained by contacting the city or downloaded from the following links.

2009 Annual Report
2010 Annual Report
2011 Annual Report
2012 Annual Report
2014 Annual Report
       - MS4 Annual Report
       - NPDES Phase II Monitoring and Assessment
       - NPDES Internal Coordination
       - 2015 Surface Water Management Plan Draft
       - Washington Department of Ecology Submission Cover Letter
       - Community Outreach Activities
       - Spill Response Chart

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