Yamhill STP - Secondary Wastewater Treatment Plant in Yamhill, Oregon

Yamhill STP is a municipal wastewater treatment facility located in Yamhill, Oregon, a small town in the Willamette Valley. The plant serves a population of approximately 1,119 residents, providing secondary treatment to manage domestic wastewater from the community. The plant operates under the U.S. Clean Water Act, which requires secondary treatment for municipal facilities. With a designed capacity of 946.35 cubic meters per day and a current discharge volume of 189.27 cubic meters per day, the plant has ample capacity for its service area. The Oregon Department of Environmental Quality oversees permitting and compliance for such facilities. Treated effluent from the plant is discharged into local streams that flow into the Yamhill River, a tributary of the Willamette River. The Willamette River eventually joins the Columbia River, which empties into the Pacific Ocean. The plant plays a key role in protecting water quality in this agriculturally important region.

The Yamhill STP discharges into small tributaries of the Yamhill River, which flows through the Willamette Valley before joining the Willamette River. The Willamette River is a major tributary of the Columbia River, which drains to the Pacific Ocean. The watershed supports diverse aquatic life, including salmonids, and the plant's secondary treatment helps reduce nutrient and organic loads that could otherwise impact downstream ecosystems.