Overview
DONALD STP is a secondary wastewater treatment plant serving Donald, Oregon. It treats approximately 640 residents with a designed capacity of 291.48 million gallons per day.
DONALD STP is a municipal wastewater treatment facility located in Donald, Oregon, a small community in Marion County. The plant serves a population of about 640 people and is part of the region's water infrastructure. The plant provides secondary treatment, which is the standard biological treatment process required by the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 291.48 million gallons per day and a current discharge volume of 75.71 million gallons per day, the facility operates well below its capacity. The treated effluent is discharged into local waterways that eventually drain into the Willamette River, a major tributary of the Columbia River. This watershed supports diverse aquatic life and is important for regional water quality and ecosystem health.
Environmental context
The plant's discharge enters the Willamette River basin, which flows northward to the Columbia River and ultimately to the Pacific Ocean. The Willamette River supports salmon runs and other sensitive aquatic species, making water quality management critical for downstream ecosystems.
Frequently asked questions
DONALD STP is located at 10860 Main Street in Donald, Oregon, within Marion County.
The plant serves approximately 640 residents in the community of Donald.
The plant discharges treated effluent into local waterways that flow into the Willamette River basin.
As a U.S. facility, DONALD 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.
For small communities, secondary treatment is the standard requirement under the Clean Water Act, which DONALD STP provides.
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