Overview
DAYVILLE STP is a secondary treatment plant serving 160 people in Dayville, Oregon. It discharges 53.00 million gallons per day and has a designed capacity of 140.06 million gallons per day.
DAYVILLE STP is a municipal wastewater treatment facility located in Dayville, Oregon, a small community in Grant County. The plant serves a population of approximately 160 residents and operates with secondary treatment, which is the standard for small agglomerations in the United States. As a secondary treatment plant, DAYVILLE STP uses biological processes to remove organic matter and suspended solids from wastewater. The plant has a designed capacity of 140.06 million gallons per day and currently discharges 53.00 million gallons per day. Under the U.S. Clean Water Act, such facilities 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 plant's treated effluent is discharged into a local water body, likely a tributary of the John Day River, which flows into the Columbia River and ultimately the Pacific Ocean. The John Day River basin supports diverse aquatic life, including salmon and steelhead, making proper wastewater treatment essential for maintaining downstream ecosystem health.
Environmental context
The plant discharges into a water body within the John Day River watershed, which drains into the Columbia River and then the Pacific Ocean. The John Day River is a major tributary of the Columbia and supports critical habitat for anadromous fish species such as Chinook salmon and steelhead trout. The surrounding semi-arid region relies on these rivers for irrigation and recreation, so maintaining water quality is vital for both ecological and human uses.
Frequently asked questions
DAYVILLE STP is located on John Day Highway in Dayville, Grant County, Oregon, United States.
The plant serves a population of 160 residents in the Dayville area.
The plant discharges treated effluent into a local water body within the John Day River watershed, which flows into the Columbia River and ultimately the Pacific Ocean.
As a U.S. facility, DAYVILLE STP operates under the Clean Water Act and is required to have an NPDES permit issued by the Oregon Department of Environmental Quality, which sets effluent limits to protect water quality.
For small communities like Dayville, secondary treatment is standard, using biological processes to remove organic matter and suspended solids. This meets the minimum requirements under the Clean Water Act for most discharges.
Nearby plants