Overview
UKIAH STP is a secondary treatment plant serving 245 people in Ukiah, Oregon. It discharges 151.42 megaliters annually and operates under US Clean Water Act regulations.
UKIAH STP is a municipal wastewater treatment plant located in Ukiah, Umatilla County, Oregon, serving a small population of 245 residents. The facility provides secondary treatment, the standard required by the US Clean Water Act for inland plants of this scale, ensuring effective removal of organic matter and suspended solids before discharge. The plant has a designed capacity of 246.05 megaliters and an annual discharge volume of 151.42 megaliters, indicating it operates well within its capacity. As a US facility, it is subject to 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 local waterway that ultimately drains into the Umatilla River and then the Columbia River basin. This connection to the Columbia River system, a major Pacific Northwest watershed, underscores the plant's role in protecting downstream aquatic ecosystems and regional water quality.
Environmental context
The plant discharges into a tributary of the Umatilla River, which flows into the Columbia River and eventually the Pacific Ocean. The Umatilla River supports diverse aquatic life, including salmon and steelhead, making the plant's secondary treatment essential for maintaining water quality in this ecologically sensitive watershed.
Frequently asked questions
UKIAH STP is located at 198 Pine Street, Ukiah, Umatilla County, Oregon, United States.
The plant serves a population of 245 people in the Ukiah area.
The plant discharges treated effluent into a local tributary that flows into the Umatilla River, part of the Columbia River basin.
As a US facility, UKIAH STP operates under the Clean Water Act and is regulated by an NPDES permit issued by the Oregon Department of Environmental Quality.
Small US plants like UKIAH STP typically use secondary treatment, which includes biological processes to remove organic matter and suspended solids, meeting EPA standards for inland discharge.
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