Overview
Coulee City STP is a secondary treatment plant in Grant County, Washington, serving 565 people. It discharges treated wastewater inland, with a designed capacity of 272.55 and current volume of 264.98.
Coulee City STP is a municipal wastewater treatment plant located in Grant County, Washington, United States. The facility serves a small population of 565 residents, operating as a secondary treatment plant under the regulatory framework of the US Clean Water Act. The plant has a designed capacity of 272.55 and a current discharge volume of 264.98, indicating near-capacity operation. As a secondary treatment facility, it meets the standard requirements for organic matter and suspended solids removal, typical for plants of this scale in the United States. The treated effluent is discharged to an inland receiving water body, contributing to the local watershed. The plant plays a role in protecting downstream water quality in the Columbia River basin, which ultimately drains to the Pacific Ocean. Its operation supports aquatic life and recreational uses in the region.
Environmental context
The plant discharges to an inland water body within the Columbia River basin, which flows into the Pacific Ocean. The local watershed supports diverse aquatic habitats and is important for regional water quality. The facility's secondary treatment helps reduce nutrient and organic loads, protecting downstream ecosystems.
Frequently asked questions
Coulee City STP is located in Grant County, Washington, United States, along the Coulee Corridor / Sunset Highway.
The plant serves a population of 565 people in the Coulee City area.
The plant discharges treated effluent to an inland water body within the Columbia River basin, which ultimately drains to the Pacific Ocean.
Coulee City STP provides secondary treatment, which removes organic matter and suspended solids, meeting standard US Clean Water Act requirements.
The plant operates under the US Clean Water Act, which requires secondary treatment for municipal wastewater. Permits are typically issued by the Washington State Department of Ecology.
Nearby plants