Overview
ASOTIN MUNICIPAL STP serves Vineland, Washington, treating wastewater for 1,255 people with secondary treatment. The plant discharges 355.83 million gallons per year into the local watershed.
ASOTIN MUNICIPAL STP is a wastewater treatment facility located in Vineland, Asotin County, Washington, United States. It serves a population of 1,255 and operates under secondary treatment standards, which is the minimum required by the US Clean Water Act for municipal plants of this scale. The plant has a designed capacity of 529.96 million gallons per year and currently discharges 355.83 million gallons annually. As a secondary treatment plant, ASOTIN MUNICIPAL STP uses biological processes to remove organic matter and suspended solids. Secondary treatment typically involves aeration and clarification. The plant's discharge volume indicates it operates below its designed capacity, suggesting room for future growth or seasonal variability. The treated effluent from ASOTIN MUNICIPAL STP is discharged into a local water body, likely a tributary of the Snake River, which flows into the Columbia River and eventually reaches the Pacific Ocean. The plant plays a key role in protecting downstream water quality in the Columbia River Basin, supporting aquatic life and recreational uses.
Environmental context
The plant discharges into a local water body within the Snake River watershed, which drains into the Columbia River and ultimately the Pacific Ocean. The Columbia River Basin supports diverse aquatic ecosystems, including salmon and steelhead runs. Secondary treatment helps reduce nutrient and organic pollution, mitigating eutrophication risks in downstream waters.
Frequently asked questions
ASOTIN MUNICIPAL STP is located at 5th Street in Vineland, Asotin County, Washington, United States.
The plant serves a population of 1,255 people.
The plant discharges treated wastewater into a local water body within the Snake River watershed, which flows into the Columbia River and eventually the Pacific Ocean.
The plant provides secondary treatment, which is the standard required by the US Clean Water Act for municipal wastewater treatment plants.
The plant operates under the US Clean Water Act, which mandates secondary treatment for municipal plants. It is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology.
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