Overview
Stevenson STP serves approximately 1,500 residents in Stevenson, Washington. The plant discharges treated wastewater into the Columbia River watershed, supporting downstream water quality in the Pacific Northwest.
Stevenson STP is a municipal wastewater treatment facility located in Stevenson, Skamania County, Washington, serving a population of about 1,500. The plant is situated in the Columbia River Gorge region, an area known for its scenic beauty and ecological significance. As a small community facility, it plays a key role in protecting local water resources. The plant operates under the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all wastewater discharges. For small agglomerations like Stevenson, secondary treatment is typically mandated to reduce organic pollutants and suspended solids. The facility's design and operation are overseen by the Washington State Department of Ecology, ensuring compliance with state water quality standards. Treated effluent from Stevenson STP is discharged into Rock Creek, a tributary of the Columbia River. The Columbia River is the largest river in the Pacific Northwest, flowing into the Pacific Ocean. The plant's operations help maintain the health of this vital waterway, which supports salmon runs, recreational activities, and municipal water supplies downstream.
Environmental context
Stevenson STP discharges into Rock Creek, which flows into the Columbia River near the Columbia River Gorge National Scenic Area. The Columbia River is a major Pacific salmon and steelhead migration corridor, and its estuary supports diverse aquatic life. The plant's treatment processes help reduce nutrient and pathogen loads, protecting downstream water quality in the Columbia River basin and ultimately the Pacific Ocean.
Frequently asked questions
Stevenson STP is located on Rock Creek Park Road in Stevenson, Skamania County, Washington, United States.
Stevenson STP serves approximately 1,500 residents in the city of Stevenson and surrounding areas.
The plant discharges treated effluent into Rock Creek, a tributary of the Columbia River, which flows into the Pacific Ocean.
Stevenson STP operates under the U.S. Clean Water Act, requiring an NPDES permit issued by the Washington State Department of Ecology to ensure compliance with water quality standards.
For small communities like Stevenson, secondary treatment is typically required under the Clean Water Act to reduce biochemical oxygen demand and suspended solids before discharge.
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