MAZON STP - Mazon, Illinois Wastewater Treatment Plant

MAZON STP (Sewage Treatment Plant) serves the village of Mazon in Grundy County, Illinois, a small community in the Midwestern United States. The plant provides secondary treatment for a population of approximately 775 residents, reflecting its role as a small-scale municipal facility. As a secondary treatment plant, MAZON STP meets the standard requirements of the US Clean Water Act, which mandates secondary treatment for municipal wastewater facilities. The plant has a designed capacity of 359.61 volume units and a discharge volume of 264.98, indicating operational utilization within its capacity. It operates under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Illinois Environmental Protection Agency. The plant's treated effluent is discharged into local streams that drain into the Illinois River basin, ultimately reaching the Mississippi River. This watershed supports diverse aquatic life and provides recreational and ecological value to the region. The plant's location inland, away from coastal areas, reduces direct marine impact but requires careful management to protect freshwater ecosystems.

MAZON STP discharges into tributaries of the Illinois River, which flows into the Mississippi River, a major North American waterway. The Illinois River basin supports diverse fish and wildlife, including migratory birds and freshwater mussels. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality in this agriculturally influenced region.