Milltown WWTP - Advanced Wastewater Treatment in Milltown, Indiana

Milltown WWTP is a municipal wastewater treatment facility located in Milltown, Harrison County, Indiana. Serving a population of 938, the plant provides advanced treatment to protect local water quality in this inland community. The facility is situated in the Ohio River watershed, which ultimately drains to the Mississippi River and the Gulf of Mexico. The plant employs advanced treatment processes, exceeding the secondary treatment standard required by the US Clean Water Act for municipal facilities. With a designed capacity of 567.81 cubic meters per day and a discharge volume matching that figure, the plant operates at full capacity. As a small agglomeration, it is subject to EPA NPDES permitting through the Indiana Department of Environmental Management, which sets effluent limits to protect receiving waters. The treated effluent from Milltown WWTP discharges into a tributary of the Ohio River, a major waterway that supports diverse aquatic life and provides drinking water for millions downstream. The advanced treatment level ensures minimal nutrient and pollutant loading, helping to maintain the ecological health of the Ohio River basin and reduce contributions to the Gulf of Mexico hypoxic zone.

Milltown WWTP discharges into a tributary of the Ohio River, which flows into the Mississippi River and ultimately the Gulf of Mexico. The Ohio River basin supports diverse aquatic species and is a critical migratory corridor for fish. Advanced treatment at this plant helps reduce nutrient loads that contribute to downstream eutrophication and the Gulf of Mexico dead zone.