Mt Etna Wastewater Treatment Plant, Huntington County, Indiana

Mt Etna wastewater treatment plant is located in Huntington County, Indiana, United States, serving a small community of 110 residents. The facility provides secondary treatment, a standard biological process that removes organic matter and suspended solids from wastewater before discharge. As a small-scale plant in the United States, it operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program, which regulates discharges to surface waters. The plant's designed capacity is 49.21 million gallons per year, matching its current discharge volume, indicating full utilization. The treated effluent is discharged into local streams that flow into the Wabash River basin, a major tributary of the Ohio River and ultimately the Mississippi River. This watershed supports diverse aquatic life and provides water resources for communities downstream.

The plant discharges into the Wabash River basin, which drains into the Ohio River and then the Mississippi River, eventually reaching the Gulf of Mexico. This watershed supports a variety of fish and wildlife species, and the plant's secondary treatment helps protect water quality in this ecologically important river system.