Overview
Clarkston STP serves approximately 7,200 residents in Clarkston, Washington. The plant discharges into the Snake River system, a major tributary of the Columbia River.
Clarkston STP is a municipal wastewater treatment facility located in Clarkston, Asotin County, Washington, serving a population of about 7,200. The plant is situated in southeastern Washington near the confluence of the Snake and Clearwater Rivers, an area characterized by semi-arid climate and agricultural land use. As a US facility, Clarkston STP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Washington State Department of Ecology. For a plant serving a population of this scale, secondary treatment is the standard requirement, with additional nutrient controls possible if the receiving water is nutrient-sensitive. The plant's treated effluent is discharged to the Snake River, which flows into the Columbia River and ultimately reaches the Pacific Ocean. The Snake River supports diverse aquatic life, including salmon and steelhead runs, making water quality management critical for downstream ecosystems and regional fisheries.
Environmental context
Clarkston STP discharges into the Snake River, a major tributary of the Columbia River system. The Snake River flows through the Columbia Plateau and joins the Columbia River, which empties into the Pacific Ocean. This watershed supports critical habitat for anadromous fish species such as Chinook salmon and steelhead trout, and the plant's discharge must comply with water quality standards to protect these resources.
Frequently asked questions
Clarkston STP is located on 13th Street in Clarkston, Asotin County, Washington, United States.
The plant serves approximately 7,200 residents in the Clarkston area.
The plant discharges treated wastewater into the Snake River, which flows into the Columbia River and eventually reaches the Pacific Ocean.
As a US facility, Clarkston STP operates under the Clean Water Act and is required to have an NPDES permit issued by the Washington State Department of Ecology, which sets limits on pollutants to protect water quality.
For a plant of this size, secondary treatment is standard under the Clean Water Act. Some facilities may also incorporate advanced treatment or disinfection depending on local water quality requirements.
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