Vallecito_Douglas Flat WWTF - Secondary Treatment Plant in Murphys, California

Vallecito_Douglas Flat WWTF is a municipal wastewater treatment facility located in Douglas Flat, near Murphys, California. Serving a small population of 400, the plant provides secondary treatment to meet state and federal water quality standards. The facility operates under the regulatory framework of the US Clean Water Act, which requires NPDES permits for discharges to surface waters. The plant's treatment process is secondary, which typically involves biological treatment to remove organic matter and suspended solids. With a designed capacity of 246.05 units and an average daily discharge of 151.42 units, the plant operates below its capacity, indicating room for future growth. The facility is managed by local municipal authorities to ensure compliance with environmental regulations. The treated effluent is discharged into local waterways that ultimately drain into the Stanislaus River watershed, part of the larger San Joaquin River basin. This region supports diverse aquatic life and is important for downstream water quality in the Central Valley and San Francisco Bay Delta ecosystem.

The plant's discharge enters the Stanislaus River watershed, which flows into the San Joaquin River and eventually reaches the San Francisco Bay Delta. This watershed supports critical habitats for fish species such as Chinook salmon and steelhead trout. The plant's secondary treatment helps reduce nutrient and pollutant loads, protecting downstream water quality in this ecologically sensitive region.