Hollister Domestic WWTP | California Wastewater Treatment Plant

Hollister Domestic WWTP is a municipal wastewater treatment facility located in Hollister, California, serving a population of about 19,500. The plant is situated in San Benito County, inland from the Pacific coast, and is part of the region's water infrastructure. As a U.S. facility, the plant is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the California State Water Resources Control Board or a regional board. For a population of this size, secondary treatment is the standard requirement, with possible additional nutrient controls depending on the receiving water body. The plant's treated effluent likely discharges to a local waterway that drains into the Pajaro River or directly to the river system, eventually reaching Monterey Bay. This coastal watershed supports diverse aquatic life and is an important ecological corridor in central California.

The plant's discharge likely enters a tributary of the Pajaro River, which flows into Monterey Bay, part of the California Current System. This coastal environment supports sensitive marine habitats, including kelp forests and migratory species. Nutrient loading from wastewater can impact water quality and ecosystem health in the bay.