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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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Stormwater Charges in Drainage Districts

Environmental Services stormwater rates include an on-site stormwater management charge (the cost to collect, convey and dispose of stormwater runoff from private property) and an off-site stormwater management charge (the cost to collect, convey and dispose of stormwater runoff from public property like streets and sidewalks).

Utility customers in the Multnomah County Drainage District—including Peninsula Drainage Districts Nos. 1 and 2 and the Multnomah County Drainage District No. 1—pay only off-site stormwater management charges to Environmental Services. The reason for this is drainage districts are considered special districts under Oregon law. Drainage districts customers manage their on-site stormwater runoff by sharing in the costs of drainage district projects.

Map of drainage district boundaries

Drainage district projects help protect lives and property from flooding by operating and maintaining stormwater and flood management systems for more than 1,200 acres of land along the Columbia Slough and the lower Columbia River. These systems include levees, pump stations, ditches, sloughs, streams and culverts. To learn more about the drainage district and related projects, please visit

Because drainage district customers help support those projects, Environmental Services developed the equitable rate structure. Environmental Services began to bill drainage district customers for stormwater charges in 2013. Rates increased incrementally each year. Drainage district customers now pay the same current rate for off-site stormwater management as other Environmental Services customers.

Call sewer and stormwater customer service at 503-823-7124 with questions or to learn more about low-income financial assistance for residential ratepayers or monthly rate estimates for commercial properties in the drainage districts.

Review the city ordinance that establishes stormwater management rates and authorizes direct billing in the drainage districts.

View the Cost Allocation Study that was the basis for separating on-site and off-site stormwater charges.