Stormwater Management Program

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To Report a Spill - Call the Spill Hotline :

Daytime:  7:00am to 3:30pm - call 206.973.4770

After Hours: call King County 24-Hour dispatch at 206.296.8100


Stormwater Compliance works to protect water quality in our lakes, streams and the Puget Sound, by coordinating citywide compliance with state and federal water quality regulations.  Our volunteer and education and outreach programs strive to raise awareness of the impacts of stormwater pollution and promote environmentally friendly business and residential practices that minimize stormwater impacts.  In addition, the Illicit Discharge Detection and Elimination (IDDE) program works to investigate and remove pollutants being discharged to the City stormwater system.


Bow Lake2019 Stormwater Management Program (SWMP) Plan   and the March 2019 NPDES Annual Report .  The SWMP Plan identifies planned activities for 2016 and the Annual Report confirms the City's annual compliance efforts under the Phase II National Pollutant Discharge Elimination System Permit.   The 2013 SWMP and the 2012 SWMP documents, as well as the below-listed Surface Water Plan, describe the City's existing Stormwater Management Program in detail, and the overall plan for the Surface Water Utility.  We encourage you to submit comments on the 2016 SWMP Plan to help us identify program needs and priorities.  Please send comments: or address written comments: City of SeaTac Public Works Stormwater,  4800 South 188th Street, SeaTac, WA 98188-8605.

Our overall goal for the program is not only to meet the requirements of the municipal stormwater permit administered by the Department of Ecology , but also to ensure that our program addresses your concerns. SeaTac Public Works staff have been working with other jurisdictions around the Puget Sound through several regional forums in a collaborative effort to share resources, tools, and methodologies to meet Ecology’s SWMP requirements.     
Known Areas Infeasible for Low Impact Development (LID)

In an effort to promote development and limit the financial impacts on the development community from the state mandated LID requirements that went into effect  January 1, 2017,   the City has created a series of outfacing web maps that indicate known areas of infeasibility for LID, by best management practice (BMP) type.  Click here for more information on these maps and how to view them.

Private Stormwater System Inspection Program

The City of SeaTac Public Works Department conducts yearly or every-other-yearl inspections of commercial and multifamily private stormwater systems to ensure the stormwater facilities are being maintained and functioning properly. Link: Private Stormwater System Inspection Program .

Public Education and Involvement

The City of SeaTac has a variety of stormwater education and involvement programs focused on raising awareness and adopting practices which help protect our natural water ways.  These programs include Fish Friendly Car Wash Kits, Storm Drain Markers and annual Green Events full of educational information, and sales of rainbarrels at a reduced rate to the resident.  For more information on these and other programs, follow this link: Stormwater Public Education and Involvement Page .

Stormwater Management Program Video - City of SeaTac Public Works is Working for You

Stormwater Management Program Documents & Manuals


Interactive Stormwater Infrastructure Map
Stormwater Infrastructure GIs Data

King County Surface Water Design Manual 2016
Addendum to 2016 King County Surface Water Design Manual 
Stormwater Pollution Prevention Manual 
Flow Control Application Map 
Water Quality Applications Map 
2012 LID Manual-Technical Guide for Puget Sound 
LID Audit Evaluation Matrix

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