Overview
Daly City WWTP serves over 100,000 residents in California. Located near the Pacific coast, it operates under the US Clean Water Act with NPDES permitting.
Daly City WWTP is a municipal wastewater treatment facility located in Daly City, California, serving a population of approximately 102,825. The plant is situated in San Mateo County, within the San Francisco Bay Area, and lies within 50 kilometers of the Pacific coast. As a large agglomeration serving over 100,000 people, the plant is expected to provide at least secondary treatment under the US Clean Water Act. The facility operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the California State Water Resources Control Board or the San Francisco Bay Regional Water Quality Control Board. The designed capacity is 1.00 million gallons per day, indicating the plant's scale. The plant's treated effluent is discharged into the San Francisco Bay or the Pacific Ocean, depending on the outfall location. The receiving waters support diverse aquatic life and are part of a major estuarine ecosystem. The plant plays a critical role in protecting water quality in the region, which is ecologically sensitive due to its proximity to coastal habitats and migratory corridors.
Environmental context
The plant discharges into the San Francisco Bay, which connects to the Pacific Ocean via the Golden Gate. This estuarine environment supports a wide range of marine and bird species, including salmon and migratory shorebirds. The bay is ecologically sensitive due to urban runoff and industrial inputs, making effective wastewater treatment essential for maintaining water quality and ecosystem health.
Frequently asked questions
Daly City WWTP is located at 22 Northgate Avenue, Westlake, Daly City, California, 94015, United States.
The plant serves approximately 102,825 residents in Daly City and surrounding areas in San Mateo County.
The treated effluent is discharged into the San Francisco Bay, which ultimately flows into the Pacific Ocean. The discharge is regulated under an NPDES permit to protect water quality.
The plant operates under the US Clean Water Act, which requires NPDES permits for discharges. For a plant of this size, secondary treatment is typically mandated, with additional requirements for nutrient removal in sensitive areas.
Plants serving 100,000 people in the US typically provide secondary treatment, which includes biological processes to remove organic matter and suspended solids. Some facilities also incorporate tertiary treatment for nutrient reduction, especially if discharging to sensitive waters like San Francisco Bay.
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