OCSD WWTP No 2 - Major Wastewater Treatment Plant in Costa Mesa, California

OCSD WWTP No 2 is a large-scale wastewater treatment plant located in Costa Mesa, California, serving a population of approximately 3.48 million. It is part of the Orange County Sanitation District's infrastructure, managing wastewater from a densely populated urban area in Southern California. As a facility serving over 150,000 people, it falls under the US EPA's National Pollutant Discharge Elimination System (NPDES) permitting program, which requires secondary treatment as a minimum. The plant's designed capacity is 1.00 (likely million gallons per day or similar unit), indicating its substantial scale. The plant is expected to meet stringent federal and state standards for wastewater treatment. The plant discharges treated effluent into the Pacific Ocean via an offshore outfall, contributing to the health of the coastal marine environment. Its location within 50 km of the coast necessitates advanced treatment to protect sensitive marine ecosystems, including kelp forests and diverse aquatic life. The facility plays a critical role in safeguarding public health and water quality in Orange County.

The plant discharges into the Pacific Ocean, which receives treated effluent from multiple coastal facilities in Southern California. The local watershed includes the Santa Ana River and Newport Bay, which drain into the ocean. The coastal environment supports diverse marine life, including fish, seabirds, and marine mammals, and is an important recreational area. Proper treatment is essential to prevent nutrient pollution and protect water quality.