Woodbrook Sewage Treatment Plant - Cowlitz County, Washington Wastewater Facility

Woodbrook Sewage Treatment Plant is a municipal wastewater facility located in Cowlitz County, Washington, United States. It serves a small population of 364 residents, reflecting its role in a rural or suburban community within the state. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for most municipal wastewater facilities. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's designed capacity is 333.12 thousand gallons per day, and it currently discharges an average of 249.84 thousand gallons per day, indicating operational headroom. The treated effluent is discharged into a local water body within the Columbia River basin. The Columbia River system is a major ecological and economic resource in the Pacific Northwest, supporting salmon runs and diverse aquatic life. The plant's operations are subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Washington State Department of Ecology, ensuring compliance with water quality standards.

The plant discharges into a tributary of the Columbia River, which flows into the Pacific Ocean. The Columbia River basin supports critical salmon and steelhead populations, making water quality management essential. The plant's secondary treatment helps protect downstream habitats from nutrient and organic pollution.