Applegate WWTF - Secondary Treatment Plant in Placer County, California

Applegate WWTF is a municipal wastewater treatment facility located in Placer County, California, serving a small population of 85 residents. The plant provides secondary treatment, a standard level required by the US Clean Water Act for inland facilities of this scale. With a designed capacity of 22.71 units and a discharge volume matching that figure, the plant operates at full capacity. As a small agglomeration, it falls under the regulatory framework of the US EPA's National Pollutant Discharge Elimination System (NPDES), which sets effluent limits to protect water quality. The plant's treated effluent is discharged into a local water body that ultimately drains into the Sacramento River basin, supporting downstream ecosystems in California's Central Valley. The region's Mediterranean climate and proximity to the Sierra Nevada foothills influence seasonal flow patterns and water quality management.

The plant discharges into a tributary of the Sacramento River, which flows through the Central Valley to the Sacramento-San Joaquin Delta and San Francisco Bay. This watershed supports diverse aquatic life, including salmon runs, and is a critical water source for agriculture and urban areas. The plant's secondary treatment helps reduce nutrient and pathogen loads to protect downstream habitats.