Joliet WWTP - Secondary Wastewater Treatment in Joliet, Montana

Joliet WWTP is a municipal wastewater treatment plant located on East Front Avenue in Joliet, Carbon County, Montana. The facility serves a population of approximately 714 residents, classifying it as a small-scale treatment plant in rural Montana. The plant provides secondary treatment, which is the minimum standard required by the US Clean Water Act for municipal wastewater facilities. With a designed capacity of 283.91 million gallons per year and an actual discharge volume of 211.98 million gallons per year, the plant operates below its design capacity. As a US facility, it is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Montana Department of Environmental Quality. The treated effluent is discharged into a local water body that ultimately drains into the Yellowstone River basin, a major tributary of the Missouri River system. This watershed supports diverse aquatic life and is an important resource for agriculture and recreation in southeastern Montana. The plant's operations help protect downstream water quality in the region.

The plant discharges into a receiving water body within the Yellowstone River basin, which flows into the Missouri River and eventually the Mississippi River system. This watershed supports diverse aquatic species, including native fish populations, and provides water for irrigation and livestock. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream ecosystems in this semi-arid region.