Biola WWTP - Secondary Treatment Plant in Butte County, California

Biola WWTP is a municipal wastewater treatment facility located on Afton Road in Butte County, California, serving a small community of 964 residents. The plant operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment for municipal discharges to surface waters. The plant provides secondary treatment, a biological process that removes organic matter and suspended solids. Its designed capacity is 378.54 cubic meters per day, with a similar discharge volume, indicating it operates near full capacity. As a small facility, it is subject to state-level NPDES permits issued by the California Water Resources Control Board. The treated effluent is discharged into a local waterway that drains into the Sacramento River system, ultimately reaching the Sacramento-San Joaquin Delta and San Francisco Bay. This watershed supports diverse aquatic life and is an important ecological corridor in Northern California.

The plant's discharge enters a tributary of the Sacramento River, which flows through the Central Valley to the Sacramento-San Joaquin Delta and San Francisco Bay. This estuarine environment supports critical habitats for fish and migratory birds. The region's Mediterranean climate with seasonal rainfall influences flow patterns and pollutant dilution.