Pierce S_T Plant Wastewater Treatment Facility, Pierce, Idaho

The Pierce S_T Plant is a small municipal wastewater treatment facility located in Pierce, Clearwater County, Idaho. Serving a population of approximately 543 residents, it is classified as a small-scale treatment plant typical of rural communities in the Pacific Northwest region of the United States. As a US-based facility, the plant operates under the regulatory framework of the Clean Water Act, administered by the Environmental Protection Agency (EPA) and delegated to the Idaho Department of Environmental Quality. For small agglomerations like this, secondary treatment is the standard requirement, ensuring that discharged water meets federal water quality standards before release into the environment. The plant's treated effluent is discharged into the Clearwater River watershed, which flows into the Snake River and ultimately the Columbia River, reaching the Pacific Ocean. The Clearwater River supports diverse aquatic life, including salmon and steelhead trout, making the plant's treatment performance critical for maintaining downstream water quality and ecosystem health.

The Pierce S_T Plant discharges into the Clearwater River basin, a tributary of the Snake River, which flows into the Columbia River and empties into the Pacific Ocean. The Clearwater River is a key habitat for anadromous fish species such as Chinook salmon and steelhead, which rely on clean water for spawning and migration. The plant's operations are therefore important for preserving the ecological integrity of this river system.