GILLETTE WWTP - Campbell County, Wyoming Wastewater Treatment Plant

GILLETTE WWTP is a municipal wastewater treatment facility located in Campbell County, Wyoming, serving an estimated population of 32,716. The plant is situated in the semi-arid high plains region of northeastern Wyoming, an area characterized by coal mining and energy production. As a medium-sized agglomeration, the facility plays a key role in managing local wastewater from residential and industrial sources. Under the U.S. Clean Water Act, the plant operates with a National Pollutant Discharge Elimination System (NPDES) permit issued by the Wyoming Department of Environmental Quality. For a population of this scale, secondary treatment is typically required, which involves biological processes to remove organic matter and suspended solids. Regulatory compliance ensures appropriate treatment levels. The treated effluent is discharged into local waterways that drain into the Belle Fourche River, a tributary of the Cheyenne River, which ultimately flows into the Missouri River system. This watershed supports agricultural irrigation, livestock watering, and wildlife habitat. The plant's operations are critical for protecting downstream water quality in this semi-arid region where water resources are limited.

The plant discharges into the Belle Fourche River watershed, which flows into the Cheyenne River and then the Missouri River, eventually reaching the Mississippi River and the Gulf of Mexico. This region is part of the semi-arid High Plains, where water scarcity makes wastewater treatment essential for maintaining streamflow and water quality. The receiving waters support diverse aquatic life, including native fish species, and are used for agricultural irrigation and livestock watering. Protecting this watershed from nutrient pollution and pathogens is vital for both ecological health and human uses downstream.