Fairfield Suisun WWTP - Municipal Wastewater Treatment in Fairfield, California

Fairfield Suisun WWTP is a municipal wastewater treatment facility located in Fairfield, California, serving a population of approximately 152,000. The plant is situated in Solano County, within the San Francisco Bay Area, and operates under the regulatory framework of the US Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for discharges to surface waters. As a large agglomeration serving over 100,000 people, the plant is expected to provide at least secondary treatment, with potential additional nutrient removal to protect sensitive receiving waters. The designed capacity is 1.00 million gallons per day, indicating the plant's scale relative to the population served. The plant's treated effluent is discharged into the Suisun Bay watershed, which flows into the San Francisco Bay and ultimately the Pacific Ocean. This estuary is a critical habitat for diverse aquatic species, including salmon and migratory birds, and supports important ecological functions such as nutrient cycling and sediment transport.

The plant discharges into the Suisun Bay watershed, part of the larger San Francisco Bay-Delta system, which drains into the Pacific Ocean. This estuary is ecologically sensitive, supporting diverse aquatic life including endangered fish species and serving as a key migratory corridor for birds. The region's Mediterranean climate with seasonal rainfall influences flow patterns and pollutant dilution.