Six Mile Village WWTF - Secondary Wastewater Treatment in Calaveras County, California

Six Mile Village WWTF is a municipal wastewater treatment facility located in Calaveras County, California, serving a small population of 133 residents. The plant operates under secondary treatment, which is the standard level required by the US Clean Water Act for most domestic wastewater facilities. With a designed capacity of 75.71 megaliters and an annual discharge volume of 37.85 megaliters, the plant operates well below its capacity. As a US facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the California State Water Resources Control Board, which set effluent limits to protect water quality. The plant's treated effluent is discharged to a local waterway within the Sierra Nevada foothills, ultimately contributing to the San Joaquin River basin and the Sacramento-San Joaquin Delta. This region supports diverse aquatic habitats and is critical for California's water supply and ecosystem health.

The plant discharges into a local stream within the Sierra Nevada foothills, part of the larger San Joaquin River watershed. This river system flows through the Central Valley and into the Sacramento-San Joaquin Delta, a vital estuary that supports migratory fish species and provides water for agriculture and urban use. The area's Mediterranean climate with seasonal rainfall influences runoff patterns and stream flows.