Wilsonville STP, Wilsonville

Overview

Wilsonville STP is a municipal wastewater treatment plant serving approximately 22,000 residents in Wilsonville, Oregon. It operates under the U.S. Clean Water Act and discharges treated effluent into the Willamette River.

Wilsonville STP is a municipal wastewater treatment facility located in Wilsonville, Oregon, serving a population of about 22,111. The plant is situated along the Willamette River, a major tributary of the Columbia River, and plays a key role in protecting local water quality. As a plant serving a medium-sized agglomeration, Wilsonville STP is expected to meet secondary treatment standards under the U.S. Clean Water Act, administered through the National Pollutant Discharge Elimination System (NPDES) permit program. The Oregon Department of Environmental Quality oversees permitting and compliance for facilities in the state. The plant's treated effluent is discharged into the Willamette River, which flows north to join the Columbia River near Portland. The Willamette River supports diverse aquatic life, including salmon and steelhead runs, and is an important ecological and recreational resource for the region.

Environmental context

Wilsonville STP discharges into the Willamette River, a major tributary of the Columbia River system. The lower Willamette River is designated as a critical habitat for several fish species, including Chinook salmon and steelhead. The plant's operations are essential for maintaining water quality in this ecologically sensitive river corridor, which supports diverse aquatic life and serves as a migratory pathway for anadromous fish.

Frequently asked questions

Wilsonville STP is located in Wilsonville, Clackamas County, Oregon, United States, near the Willamette River.

Wilsonville STP serves approximately 22,111 people in the Wilsonville area.

The plant discharges treated effluent into the Willamette River, which flows into the Columbia River and eventually to the Pacific Ocean.

Wilsonville STP operates under the U.S. Clean Water Act, with NPDES permits issued by the Oregon Department of Environmental Quality.

Plants of this scale typically provide secondary treatment, which includes biological processes to remove organic matter and suspended solids, meeting EPA standards.