PAW PAW STP - Paw Paw, Illinois Wastewater Treatment Plant

PAW PAW STP is a municipal wastewater treatment facility located in Paw Paw, Illinois, United States. The plant serves a small community of approximately 926 residents, reflecting its role in managing local domestic wastewater in a rural setting. The plant provides secondary treatment, which is the standard biological treatment process required under the U.S. Clean Water Act for municipal facilities. With a designed capacity of 567.81 m³/day and a current discharge volume of 378.54 m³/day, the plant operates below its capacity, indicating room for future growth. The facility is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged to a local water body, likely a stream or river within the Rock River basin, which ultimately drains to the Mississippi River. This discharge supports the ecological health of downstream waters, including aquatic habitats and recreational areas. The plant's inland location reduces direct marine impact, but its performance is critical for maintaining local water quality in the agricultural landscape of northern Illinois.

The plant discharges into a local watercourse within the Rock River watershed, which flows into the Mississippi River and eventually the Gulf of Mexico. This region supports diverse aquatic life and is important for migratory birds. The secondary treatment process helps reduce nutrient loads, protecting downstream ecosystems from eutrophication.