Overview
Plainfield STP serves approximately 18,400 residents in Plainfield, Indiana. The plant operates under the U.S. Clean Water Act, which mandates secondary treatment for municipal wastewater.
Plainfield STP is a municipal wastewater treatment facility located in Plainfield, Indiana, serving a population of about 18,400. The plant is situated in Hendricks County, within the state's central region, and is part of the broader wastewater infrastructure managed by local authorities. As a U.S. facility, Plainfield STP operates under the Clean Water Act, which requires secondary treatment for municipal wastewater. The National Pollutant Discharge Elimination System (NPDES) permits, issued by the Indiana Department of Environmental Management, govern discharge limits and monitoring. For a plant serving this population size, typical treatment includes biological processes such as activated sludge or trickling filters, followed by disinfection. The treated effluent is discharged into a local waterway that ultimately drains into the Mississippi River Basin. The plant's operations help protect downstream water quality, supporting aquatic life and recreational uses in the region's streams and rivers.
Environmental context
The plant discharges into a tributary of the White River, which flows through central Indiana before joining the Wabash River and eventually the Ohio and Mississippi Rivers. This watershed supports diverse aquatic species and provides drinking water for downstream communities. The plant's treatment helps reduce nutrient and pathogen loads, mitigating eutrophication risks in the river system.
Frequently asked questions
Plainfield STP is located on South Center Street in Plainfield, Hendricks County, Indiana, United States.
The plant serves approximately 18,396 residents in the Plainfield area.
The treated effluent is discharged into a local tributary that flows into the White River, part of the Mississippi River Basin.
As a U.S. facility, Plainfield STP operates under the Clean Water Act, with NPDES permits issued by the Indiana Department of Environmental Management.
Plants of this scale typically use secondary treatment processes such as activated sludge or trickling filters, followed by disinfection, to meet NPDES permit limits.
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