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Washington County Maintenance Yard

Hillsboro, Oregon

Stormwater Treatment


Washington County


Washington County Engineering Department


Benchmark Contracting


November 2013

Technical Description:

  • The Stormwater Management StormFilter®
  • 8’ x 20’ vault with 39 cartridges

Washington County Oregon has adopted Clean Water Services Design and Construction Standards that require the construction of Water Quality Facilities to meet Total Maximum Daily Loads (TMDL). 

The Washington County Maintenance Yard, located in Hillsboro, Oregon, captures stormwater from buildings, parking lots and maintenance yards. Stormwater outfall TMDL measurements at the site did not meet the Department of Environmental Quality minimum requirements. Engineers needed to develop a new stormwater treatment design that would meet the requirements for TMDL runoff and was compatible with the limited land space.

After evaluating the alternatives, engineers at the Washington County Engineering Department selected the Stormwater Management StormFilter from Contech Engineered Solutions. The StormFilter is a passive, flow-through stormwater treatment device comprised of a structure that houses rechargeable, media-filled cartridges that trap particulates and adsorbs materials such as dissolved metals, hydrocarbons, nutrients and other pollutants of concern. The StormFilter at this site consisted of an 8’ x 20’ vault containing 39 filter cartridges containing filtering media made from Perlite.

Contech’s StormFilter has a well-established regulatory approval across the country and allowed the engineers to meet the water quality and TMDL requirements of the site. With a large treatment area and small footprint, the StormFilter could easily fit within the available land space. “Contech was very professional and efficient in assisting Washington County with our requirements,” said Rocky Brown, Engineering associate with LUT Engineering and Construction Services.

StormFilter also offers quick installation. In this case, the StormFilter was installed in less than two hours. “As the general contractor and installer of the StormFilter at the Washington County Maintenance Yard, it was a pleasure working with Contech Engineered Solutions,” said Kelly Fitzpatrick of Benchmark Contracting. “Contech expedited the delivery of the vault to meet our schedule, provided us with a pre-construction meeting prior to the delivery date, and was on-site for the installation to support the crew.”

Technical Description:

  • The Stormwater Management StormFilter®
  • 8’ x 20’ vault with 39 cartridges

800-338-1122 |


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