Mokelumne Hill WWTF - Secondary Wastewater Treatment in Calaveras County, California

Mokelumne Hill WWTF is a municipal wastewater treatment facility located in Calaveras County, California, serving a small population of 1,010 residents. The plant operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater discharges to surface waters. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 567.81 thousand cubic meters per year and an actual discharge volume of 264.98 thousand cubic meters per year, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged to a local water body within the Mokelumne River watershed, which ultimately drains to the San Joaquin River and then to the Sacramento-San Joaquin Delta and San Francisco Bay. This downstream ecosystem supports diverse aquatic life and is an important migratory corridor for fish species.

The plant discharges into a tributary of the Mokelumne River, which flows into the San Joaquin River and eventually reaches the Sacramento-San Joaquin Delta and San Francisco Bay. This watershed supports diverse aquatic habitats and is critical for migratory fish species. The region's Mediterranean climate with seasonal rainfall influences flow patterns and dilution capacity.