Overview
Willamina STP is a secondary treatment plant serving 1,840 people in Willamina, Oregon. It discharges treated wastewater into the local watershed, operating under U.S. EPA NPDES regulations.
Willamina STP is a municipal wastewater treatment plant located in Willamina, Oregon, serving a population of approximately 1,840 residents. The facility is situated in Polk County and provides secondary treatment, a standard level for small communities in the United States. The plant has a designed capacity of 832.79 volume units and currently handles a discharge volume of 333.12 units, indicating it operates below its capacity. As a U.S. facility, it is regulated under the Clean Water Act and must comply with National Pollutant Discharge Elimination System (NPDES) permits issued by the Oregon Department of Environmental Quality, which set effluent limits to protect water quality. The treated effluent is discharged into a receiving water body that ultimately drains into the Willamette River basin, a major tributary of the Columbia River. This watershed supports diverse aquatic life and is important for regional water resources, including salmon habitat and agricultural use.
Environmental context
The plant discharges into a local waterway that flows into the Willamette River, which then joins the Columbia River before reaching the Pacific Ocean. This watershed supports critical salmon runs and diverse aquatic ecosystems. The secondary treatment process reduces organic pollutants and suspended solids, helping to maintain water quality in the downstream environment.
Frequently asked questions
Willamina STP is located on Lincoln Street Southeast in Willamina, Polk County, Oregon, United States.
The plant serves a population of approximately 1,840 residents in the Willamina area.
The plant discharges treated effluent into a local waterway that flows into the Willamette River basin, ultimately reaching the Columbia River and the Pacific Ocean.
Willamina STP provides secondary treatment, which is the standard required by the U.S. Clean Water Act for municipal wastewater plants to reduce organic matter and suspended solids.
As a U.S. facility, Willamina STP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Oregon Department of Environmental Quality, ensuring its discharge meets water quality standards.
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