Greencastle WWTP - Putnam County, Indiana Wastewater Treatment Plant

Greencastle WWTP is a municipal wastewater treatment facility located in Putnam County, Indiana, serving a population of about 9,400. The plant is situated in the Wabash River watershed, which drains into the Ohio River and ultimately the Mississippi River. As a US facility of this scale, Greencastle WWTP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Indiana Department of Environmental Management. These permits set effluent limits to protect water quality. The plant's treatment processes are designed to meet secondary treatment standards typical for municipal plants serving communities of this size. The plant discharges treated wastewater into a local receiving water body that flows into the Wabash River, a major tributary of the Ohio River. The Wabash River supports diverse aquatic life and is an important ecological corridor in the Midwest. Proper treatment at Greencastle WWTP helps maintain water quality in the downstream watershed.

Greencastle WWTP discharges into a tributary of the Wabash River, which flows through Indiana and Illinois before joining the Ohio River. The Wabash River basin supports a variety of fish and wildlife, including several species of freshwater mussels. The plant's location in an inland agricultural region means its effluent quality is important for maintaining the ecological health of the river system.