Overview
Caseyville Township West Facility serves Union Hill, Illinois, treating wastewater for approximately 5,000 residents. The plant operates under the U.S. Clean Water Act framework.
Caseyville Township West Facility is a municipal wastewater treatment plant located at 121 Parr Avenue in Union Hill, Illinois, within Saint Clair County. The facility serves a population of about 5,000 people, placing it in the small-to-medium agglomeration category. As a U.S. plant, it operates under the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. For plants of this scale, secondary treatment is typically mandated to meet water quality standards. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. This region supports diverse aquatic life and provides important ecosystem services. The plant's operation helps protect downstream water quality in the Mississippi River system.
Environmental context
The plant discharges into tributaries of the Mississippi River, which flows into the Gulf of Mexico. The Mississippi River basin is a major ecological corridor supporting diverse fish and wildlife species. Downstream waters are sensitive to nutrient loading, which can contribute to hypoxic zones in the Gulf.
Frequently asked questions
The plant is located at 121 Parr Avenue in Union Hill, Illinois, within Saint Clair County.
The facility serves approximately 5,000 residents in the Union Hill area.
Treated effluent is discharged into local waterways that are part of the Mississippi River basin.
The plant operates under the U.S. Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permit requirements.
Plants of this scale in the U.S. typically provide secondary treatment to meet water quality standards under the Clean Water Act.
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