Dunlap Collection System Wastewater Treatment Plant, Dunlap, Illinois

The Dunlap Collection System is a municipal wastewater treatment facility located in Dunlap, Illinois, a village in Peoria County. The plant serves a population of approximately 1,461 residents, classifying it as a small-scale treatment facility within the state's wastewater infrastructure. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids, meeting the standard requirements under the U.S. Clean Water Act. The plant has a designed capacity of 359.61 million gallons and reports an annual discharge volume of 529.96 million gallons, indicating it operates within its capacity. Facilities of this size in Illinois are typically regulated under the National Pollutant Discharge Elimination System (NPDES) permit program administered by the Illinois Environmental Protection Agency. The plant discharges treated effluent into local waterways that ultimately drain into the Illinois River basin, a major tributary of the Mississippi River. The Illinois River supports diverse aquatic life and is an important ecological corridor in the Midwest. The plant's operations contribute to protecting water quality in the region's surface waters.

The Dunlap Collection System discharges into the Illinois River watershed, which flows into the Mississippi River and eventually to the Gulf of Mexico. The Illinois River supports a variety of fish and wildlife, including migratory birds and freshwater mussels. The plant's secondary treatment helps reduce nutrient and organic pollution, mitigating impacts on downstream water quality and aquatic ecosystems.