Woodbridge WWTF - San Joaquin County, California Wastewater Treatment Plant

Woodbridge WWTF is a municipal wastewater treatment facility located in San Joaquin County, California, serving a population of approximately 3,765 residents. The plant is situated inland, over 50 km from the Pacific coast, and operates within the broader San Joaquin River watershed. As a small-scale facility in the United States, Woodbridge WWTF is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting requirements. For plants serving fewer than 10,000 people, secondary treatment is typically mandated, with additional nutrient controls if discharging to sensitive water bodies. The treated effluent from Woodbridge WWTF ultimately drains into the San Joaquin River, which flows northward through California's Central Valley before joining the Sacramento River and emptying into the San Francisco Bay and the Pacific Ocean. This watershed supports critical aquatic habitats and agricultural water supplies, making proper treatment essential for downstream ecosystem health.

The plant discharges into the San Joaquin River basin, part of the larger Sacramento-San Joaquin Delta system. This region is ecologically sensitive, supporting diverse fish species including salmon and delta smelt, and provides water for extensive agricultural irrigation. The downstream San Francisco Bay estuary is a vital migratory corridor for waterfowl and marine life.