NAPA SANIT DIST WWRF - Napa, California Wastewater Treatment Plant

NAPA SANIT DIST WWRF (Napa Sanitation District Water Reclamation Facility) is a key wastewater treatment plant located in Napa, California, along the Napa River Trail. Serving a population of around 77,348, the plant is a medium-to-large agglomeration under US regulatory standards. It operates within the framework of the US Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for discharges to surface waters. Plants of this scale in California typically employ secondary or advanced treatment to meet stringent state and federal water quality standards. The designed capacity of 1.00 million gallons per day suggests the facility is sized to handle the community's wastewater flows. It is assumed to be regulated by the California State Water Resources Control Board or the San Francisco Bay Regional Water Quality Control Board. The treated effluent is discharged to the Napa River, which flows southward through the Napa Valley and ultimately into the San Pablo Bay, part of the San Francisco Bay estuary. This watershed supports diverse aquatic life and is an important ecological corridor for migratory fish species. The plant's operations are critical for protecting water quality in the Napa River and downstream bay ecosystems.

The Napa River flows through the Napa Valley wine region and empties into San Pablo Bay, a northern arm of the San Francisco Bay estuary. This watershed supports a variety of aquatic species, including steelhead trout and Chinook salmon, and is an important migratory corridor. The plant's discharge must meet water quality standards to protect these sensitive habitats and recreational uses.