Waterloo City Of Wastewater Treatment Plant, Waterloo, Illinois

The Waterloo City Of wastewater treatment plant is located at 100 West 4th Street in Waterloo, Illinois, within Monroe County. It serves a population of about 10,100 residents, classifying it as a medium-sized municipal facility in the Midwestern United States. As a US-based plant serving a community of this scale, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting. The state of Illinois, through the Illinois Environmental Protection Agency, typically issues permits that set effluent limits to protect water quality. Plants of this size commonly employ secondary treatment as a minimum standard. The plant discharges treated wastewater into local waterways that ultimately drain into the Mississippi River basin. The Mississippi River system supports diverse aquatic life and provides drinking water for millions downstream. Effective treatment at this facility helps maintain water quality in the region's surface waters.

The plant's treated effluent enters local streams that flow into the Mississippi River, a major North American waterway. The Mississippi River basin supports a wide range of fish species and migratory birds, and its water quality is critical for downstream communities and ecosystems. Proper wastewater treatment in this region helps reduce nutrient loading and protect aquatic habitats.