West Point STP - Secondary Wastewater Treatment Plant in Calaveras County, California

West Point STP is a municipal wastewater treatment facility located on Schadd's Road in Calaveras County, California, United States. The plant serves a population of approximately 3,000 residents, classifying it as a small-scale treatment facility within the state's wastewater infrastructure. The plant provides secondary treatment, a standard level required by the U.S. Clean Water Act for most municipal facilities. With a designed capacity of 2,195.53 cubic meters per day and an actual discharge volume of 946.35 cubic meters per day, the plant operates well within its capacity. As a U.S. facility, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged into a local water body within the Sierra Nevada foothills region. The plant plays a key role in protecting downstream water quality in the Mokelumne River watershed, which ultimately drains into the Sacramento-San Joaquin Delta and San Francisco Bay. Its operation helps maintain the ecological health of these important aquatic systems.

The plant discharges into a tributary of the Mokelumne River, which flows through the Sierra Nevada foothills into the Sacramento-San Joaquin Delta and ultimately San Francisco Bay. This watershed supports diverse aquatic life, including salmon and steelhead trout populations. The region's Mediterranean climate with seasonal rainfall means the plant must manage variable flows to prevent pollution during dry periods.