Lake County DPW Mill Creek WWTP - Old Mill Creek, Illinois Wastewater Treatment

Lake County DPW Mill Creek WWTP is a municipal wastewater treatment facility located in Old Mill Creek, Illinois, within Lake County. The plant serves a population of approximately 6,719 residents, reflecting a small to medium-sized agglomeration typical of suburban communities in the Great Lakes region. As a facility operating under the U.S. Clean Water Act, the plant is subject to National Pollutant Discharge Elimination System (NPDES) permitting requirements. Plants of this scale commonly employ secondary treatment followed by disinfection to meet effluent limits. The designed capacity of 1.00 million gallons per day indicates the plant's ability to handle peak flows from the service area. The treated effluent is discharged into local waterways that ultimately drain into the Lake Michigan basin. Lake Michigan is a critical freshwater resource providing drinking water and recreational opportunities for millions. The plant's operations are regulated to protect downstream water quality and aquatic habitats in the region.

The plant discharges into streams within the Lake Michigan watershed, which flows into Lake Michigan, one of the largest freshwater lakes in the world. The lake supports diverse aquatic life and serves as a major drinking water source. Effluent from the plant must meet stringent water quality standards to prevent nutrient enrichment and protect the lake's ecological balance.