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Thurston County Stormwater Utility

Storm and Surface Water Utility Capital Rate

The Thurston County Storm and Surface Water utility rate has two components: a base rate and a capital rate (described on this page). The rates appear as a single stormwater charge on annual property tax statements.

Capital Rate for 2016

The capital rate pays for the construction of projects that have been prioritized and approved by the Thurston County Board of Commissioners. The capital rate varies, depending on whether the property is within the boundaries of the federal NPDES Phase II Permit. (Click here for a 2.7 MB PDF of the NPDES boundaries.)

All residential properties are charged a fixed capital rate per parcel.  The rate is based on the footage of impervious surface found on an average residential property (3,600 square feet).

Commercial and public property rates are calculated based on the how many residences-worth (3,600 square feet) of impervious surface the property has.

Agricultural and vacant properties pay no capital rate.

Click here for a PDF of stormwater construction projects that are included in Thurston County's Capital Facilities Plan (see page 4-1).

Capital rate examples (2016)

within NPDES outside NPDES
Single family residential property $27 per year/per unit $5 per year/per unit
Agricultural and vacant properties no capital rate no capital rate
Commercial building $27 per 3,600 sq. ft. of impervious surface $5 per 3,600 sq. ft. of impervious surface

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Contact Us

 Staff contact: Marc Vachon: (360) 786-5526. E-mail: vachonm@co.thurston.wa.us.

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