Troy Mills WWTP - Secondary Treatment Plant in Linn County, Iowa

Troy Mills WWTP is a municipal wastewater treatment facility located in Linn County, Iowa, United States. The plant serves a small population of 210 residents, reflecting its role in a rural or small community setting within the state. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 151.42 megaliters per year and an actual discharge volume of 113.56 megaliters per year, the facility operates below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. The plant's operations contribute to protecting downstream water quality in the region's rivers and streams, supporting aquatic life and recreational uses.

The plant discharges into tributaries of the Cedar River, which flows into the Iowa River and then the Mississippi River. The Mississippi River is a major ecological corridor supporting diverse fish and wildlife. The plant's secondary treatment helps reduce nutrient and pollutant loads, protecting downstream aquatic habitats and water quality.