Windfall WWTP - Greentown, Indiana | Advanced Wastewater Treatment

Windfall WWTP is a municipal wastewater treatment facility located at 299 North Indiana Street in Greentown, Indiana, within Howard County. The plant serves a population of approximately 970 residents, classifying it as a small-scale facility in the rural Midwest. The plant employs advanced treatment processes, exceeding the secondary treatment standard required by the US Clean Water Act. With a designed capacity of 492.10 million gallons per year and an actual discharge volume of 340.69 million gallons per year, the facility operates well within its capacity. As a US plant, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Indiana Department of Environmental Management, which set effluent limits to protect water quality. The treated effluent from Windfall WWTP is discharged into local waterways that ultimately drain into the Mississippi River Basin. The plant plays a key role in protecting downstream aquatic ecosystems by removing pollutants before discharge, supporting water quality in the Wabash River watershed and beyond.

The plant discharges into the Wabash River watershed, which flows into the Ohio River and then the Mississippi River before reaching the Gulf of Mexico. This downstream chain supports diverse aquatic life and is an important migratory corridor for fish. The advanced treatment helps reduce nutrient loading, which is critical for mitigating hypoxia in the Gulf of Mexico.