TWISP S_T FACILITY - Secondary Wastewater Treatment in Okanogan County, Washington

TWISP S_T FACILITY is a municipal wastewater treatment plant located in Okanogan County, Washington, United States. Serving a population of 925, this facility provides secondary treatment to manage domestic wastewater from the local community. The plant is situated in a rural area of north-central Washington, near the Methow Valley. As a secondary treatment plant, TWISP S_T FACILITY meets the standard requirements under the U.S. Clean Water Act, which mandates secondary treatment for municipal wastewater to protect water quality. The plant's designed capacity is 564.02 volume units, with a discharge volume of 564.03, indicating it operates near its design capacity. The facility is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Washington State Department of Ecology. The treated effluent from TWISP S_T FACILITY is discharged into the local watershed, which ultimately drains into the Methow River, a tributary of the Columbia River. The Columbia River basin supports diverse aquatic life and is an important ecological corridor in the Pacific Northwest. The plant's operation helps protect downstream water quality in this sensitive river system.

The plant discharges into the Methow River watershed, which flows into the Columbia River, a major waterway in the Pacific Northwest. The Columbia River supports salmon runs and diverse aquatic ecosystems. The Methow Valley is known for its scenic beauty and recreational importance, making water quality protection critical for both ecological health and local community use.