SALEM STP - Salem, Illinois Wastewater Treatment Plant

SALEM STP is a municipal wastewater treatment plant located in Salem, Illinois, serving a population of about 7,863. The facility is situated inland, away from coastal areas, and operates under the regulatory framework of the United States Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for discharges into surface waters. As a plant serving a small agglomeration, typical treatment for this scale includes secondary treatment to meet effluent standards. The plant's design and operation are subject to state and federal regulations to protect water quality. Plants of this size commonly employ activated sludge or lagoon systems. The treated effluent from SALEM STP is discharged into local streams that flow into the Kaskaskia River, a major tributary of the Mississippi River. The Kaskaskia River supports diverse aquatic life and is an important water resource for the region. The plant plays a key role in maintaining water quality in the watershed.

SALEM STP discharges into local waterways that drain into the Kaskaskia River, which flows southwest to join the Mississippi River. The Kaskaskia River basin supports a variety of fish and wildlife, including several species of freshwater mussels. The plant's operations help protect downstream water quality in the Mississippi River system.