San Jose Creek WRP - Major Wastewater Treatment Plant in Whittier, California

San Jose Creek WRP is a major wastewater treatment facility located in Whittier, California, serving a population of 1,000,000. The plant is part of the Los Angeles County sanitation infrastructure and handles a significant portion of the region's wastewater. As a large-scale facility serving over 100,000 people, the plant is subject to stringent federal and state regulations under the US Clean Water Act. It operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the California State Water Resources Control Board, which sets limits on effluent quality to protect receiving waters. The plant's treated effluent is discharged into the San Gabriel River, which flows into the Pacific Ocean via the Los Angeles River estuary. This discharge supports local aquatic habitats and contributes to the water supply for downstream ecosystems, including coastal wetlands and marine environments.

The plant discharges into the San Gabriel River, which flows through Los Angeles County before reaching the Pacific Ocean. The river supports diverse aquatic life and provides critical habitat for migratory birds and fish species. Downstream, the estuary and coastal waters are ecologically sensitive areas that benefit from the plant's treatment processes.