Quincy Domestic STP - Wastewater Treatment Plant in Quincy, Washington

Quincy Domestic STP is a municipal wastewater treatment facility located in Quincy, Washington, serving a population of about 2,864. The plant is situated in Grant County, near State Route 281, and plays a key role in managing wastewater for this inland community. As a small-scale facility, it operates under the regulatory framework of the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all point source discharges. Plants of this size in Washington typically employ secondary treatment to meet state and federal standards. The population served suggests a moderate-scale operation. Regulatory oversight is provided by the Washington State Department of Ecology, which issues permits to ensure compliance with water quality standards. The treated effluent from Quincy Domestic STP is discharged into the local environment, ultimately contributing to the Columbia River basin. The Columbia River is a major waterway in the Pacific Northwest, supporting diverse aquatic life and providing water for irrigation, recreation, and hydropower. The plant's operations are important for protecting downstream water quality in this ecologically significant river system.

The plant discharges into the Columbia River basin, one of the largest river systems in North America. The Columbia River flows through Washington and Oregon before reaching the Pacific Ocean, supporting salmon runs and other native fish species. The surrounding area is semi-arid, with agriculture being a primary land use, making water quality management critical for both ecological health and human uses.