Brewster STP - Secondary Wastewater Treatment Plant in Brewster, Washington

Brewster STP is a municipal wastewater treatment facility located in Brewster, Washington, a small city in Okanogan County. The plant serves a population of 2,262 and operates as part of the region's water infrastructure. The plant provides secondary treatment, a standard level for communities of this size under the U.S. Clean Water Act. It has a designed capacity of 1,582.30 volume units and currently discharges 832.79 volume units, indicating operational headroom. As a U.S. facility, it operates under an EPA NPDES permit issued by the Washington State Department of Ecology, which sets effluent limits to protect receiving waters. The treated wastewater flows into the Columbia River basin, a major Pacific Northwest watershed that drains to the Pacific Ocean. The Columbia River supports diverse aquatic life, including salmon runs, and the plant's discharge is regulated to minimize environmental impact on this ecologically important system.

Brewster STP discharges into the Columbia River basin, which flows through Washington and Oregon before reaching the Pacific Ocean. The Columbia River is a vital ecological corridor supporting salmon, steelhead, and other native species. The plant's secondary treatment and NPDES permit help maintain water quality in this sensitive river system, which is also used for irrigation, recreation, and hydropower.