Overview
Arnold STP is a secondary wastewater treatment plant serving 900 people in Ganns, California. It discharges 302.83 megaliters annually and operates under U.S. EPA and state regulations.
Arnold STP is a municipal wastewater treatment plant located in Ganns, Calaveras County, California. It serves a small population of 900 residents, reflecting its role in a rural community in the Sierra Nevada foothills. The plant provides secondary treatment, which is the standard required by the U.S. Clean Water Act for municipal facilities. With a designed capacity of 643.52 megaliters and an annual discharge volume of 302.83 megaliters, it operates well within its capacity. The plant is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the California State Water Resources Control Board. The treated effluent is discharged into local waterways that ultimately drain into the San Joaquin River system and then to the Sacramento-San Joaquin Delta and San Francisco Bay. This watershed supports diverse aquatic life and is an important ecological corridor in California.
Environmental context
Arnold STP discharges into tributaries of the Stanislaus River, which flows into the San Joaquin River, then to the Sacramento-San Joaquin Delta and San Francisco Bay. The downstream environment supports sensitive aquatic species and is a critical habitat for migratory fish, including salmon and steelhead trout. The region's Mediterranean climate with seasonal rainfall influences flow patterns and water quality management.
Frequently asked questions
Arnold STP is located on Highway 4 in Ganns, Calaveras County, California, United States.
The plant serves a population of 900 people, making it a small-scale municipal facility.
The plant discharges treated effluent into local waterways that flow into the Stanislaus River, part of the San Joaquin River basin.
The plant operates under the U.S. Clean Water Act and is regulated through the National Pollutant Discharge Elimination System (NPDES) permit program, enforced by the California State Water Resources Control Board.
For small communities, secondary treatment is standard under the Clean Water Act, which Arnold STP provides. This includes biological treatment to reduce organic matter and suspended solids.
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