Carrollton WWTP and Sewer System - Waterloo, Ohio Wastewater Treatment

Carrollton WWTP and Sewer System is a municipal wastewater treatment facility located in Waterloo, Carroll County, Ohio. Serving a population of about 3,300, the plant is part of the region's infrastructure for managing domestic wastewater from the community. As a small-scale treatment plant in the United States, it operates under the regulatory framework of the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. Plants of this size typically employ secondary treatment to meet federal and state standards for effluent quality. The plant discharges treated wastewater into local streams that drain into the Ohio River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. Its operation helps protect downstream water quality and supports the ecological health of the region's freshwater systems.

The plant's treated effluent enters small tributaries within the Ohio River watershed, which flows into the Mississippi River and eventually the Gulf of Mexico. This inland location means the discharge affects freshwater ecosystems that support diverse aquatic life, including fish and macroinvertebrates. Proper treatment is essential to prevent nutrient enrichment and maintain water quality in downstream rivers and lakes.