STOOKEY TWP PLT 3 Wastewater Treatment Plant, Belleville, Illinois

STOOKEY TWP PLT 3 is a municipal wastewater treatment plant located in Belleville, Illinois, within Saint Clair County. The plant serves a population of approximately 17,500, placing it in the small-to-medium agglomeration category for US facilities. As a US-based plant, STOOKEY TWP PLT 3 operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting. Plants of this scale typically employ secondary treatment as a minimum standard, with potential for additional nutrient removal depending on local watershed requirements. The plant discharges treated effluent into the local watershed, which ultimately drains into the Mississippi River system. This river basin supports diverse aquatic life and provides drinking water for downstream communities. The plant's operations contribute to protecting water quality in the region.

STOOKEY TWP PLT 3 discharges into the Mississippi River basin, a major waterway that flows into the Gulf of Mexico. The watershed supports diverse aquatic species and is an important migratory corridor for birds. Nutrient loading from wastewater can contribute to hypoxic zones in the Gulf, making effective treatment critical for downstream ecosystem health.