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Spill Hotline

Business Hours
(425) 398-8900

After Hours
(253) 274-6330

SWM Utility Rates

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Utility Fee

Above is the Surface Water Service Charge rate structure for all parcels in the city as per the Surface Water Master Plan. Factors like land use, parcel size, and impervious area are factored into the individual rate charge for each parcel. All residential parcels are charged a flat rate and developments/commercial land is calculated with an impervious area ratio.

Rate Adjustments and discounts are available for certain exemptions and land uses. Privately maintained flow control and water quality facilities are offered a discounted rate dependent on their design manual specifications and maintenance compliance. The newer the facility, the higher the effectiveness, and therefore the higher the discount.


The SWM Service Fee is used to continue to keep the right-of-way stormwater infrastructure effective. Use of the utility fees are spread out among inspection, maintenance, and improvements for the use by the public.