COULTERVILLE WWTF - Secondary Wastewater Treatment in Mariposa County, California

COULTERVILLE WWTF is a municipal wastewater treatment facility located in Mariposa County, California, United States. The plant serves a small community of approximately 280 residents, reflecting its role in rural wastewater management within the Sierra Nevada foothills. The plant provides secondary treatment, a standard level required by the U.S. Clean Water Act for most municipal facilities. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's designed capacity of 102.21 units and current discharge volume of 64.35 units indicate operational headroom. Treated effluent from the plant is discharged into local waterways that ultimately drain into the San Joaquin River system, contributing to the larger San Francisco Bay Delta watershed. The plant's operations help protect downstream aquatic habitats and water quality in this ecologically significant region.

The plant discharges into tributaries of the Merced River, which flows into the San Joaquin River and eventually reaches the San Francisco Bay Delta. This watershed supports diverse aquatic life, including salmonid species, and is a critical water resource for California. The plant's secondary treatment helps reduce nutrient and pollutant loads, mitigating impacts on downstream ecosystems.