Overview
Johnston City STP is a municipal wastewater treatment plant in Illinois, USA, serving approximately 3,540 residents. The facility operates under the US Clean Water Act's NPDES permit program.
Johnston City STP is a municipal wastewater treatment plant located in Johnston City, Williamson County, Illinois. The facility serves a population of approximately 3,540 residents, classifying it as a small community treatment system under US EPA guidelines. As a US-based plant, Johnston City STP operates under the National Pollutant Discharge Elimination System (NPDES) permit program, established by the Clean Water Act. This regulatory framework requires permits for any discharge of pollutants into waters of the United States, with treatment standards based on the receiving water body's designated uses. For small communities, secondary treatment is typically the minimum requirement. The plant's treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. The facility plays a key role in protecting downstream water quality in the region's streams and rivers, which support diverse aquatic life and provide recreational opportunities.
Environmental context
The plant discharges into local tributaries of the Mississippi River basin, which flows into the Gulf of Mexico. The region's waterways support diverse aquatic ecosystems and are important for recreation and wildlife. Protecting water quality in these streams helps prevent nutrient pollution and maintains habitat for fish and other aquatic species.
Frequently asked questions
Johnston City STP is located on IL 37 in Johnston City, Williamson County, Illinois, United States.
The plant serves approximately 3,540 residents, making it a small community wastewater treatment facility.
The plant discharges treated effluent into local waterways that are part of the Mississippi River basin, ultimately reaching the Gulf of Mexico.
As a US facility, it operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program, which sets discharge limits to protect water quality.
Small community plants in the US typically employ secondary treatment processes, such as activated sludge or lagoon systems, to meet NPDES permit requirements.
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