Buttonwillow WWTF - Secondary Treatment Plant in Alameda County, California

Buttonwillow WWTF is a wastewater treatment facility located in Alameda County, California, serving a small community of approximately 1,660 residents. The plant operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment for municipal wastewater discharges to protect water quality. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 567.81 units and a corresponding discharge volume, the facility is sized to meet the needs of its service area. As a small-scale plant, it is subject to state-level NPDES permits issued by the California Water Resources Control Board, ensuring compliance with effluent limits. The treated effluent is discharged into local waterways that ultimately drain into the San Francisco Bay and the Pacific Ocean. The plant plays a key role in protecting the region's aquatic ecosystems by reducing pollutant loads before discharge, supporting water quality in the downstream environment.

The plant discharges into local tributaries that flow into the San Francisco Bay, a large estuary that supports diverse aquatic life including fish, birds, and marine mammals. The bay is a critical habitat for species such as the Delta smelt and Chinook salmon, and the plant's secondary treatment helps mitigate nutrient pollution that could otherwise contribute to algal blooms and hypoxia in the downstream environment.