Caldwell WWTP and Sewer System - Municipal Wastewater Treatment in Caldwell, Ohio

Caldwell WWTP and Sewer System is a municipal wastewater treatment facility located at 511 Railroad Street in Caldwell, Noble County, Ohio. Serving a population of about 5,369, the plant is part of the community's essential infrastructure for managing domestic wastewater in this inland Appalachian region. As a small-scale facility in the United States, the plant operates under the regulatory framework of the Clean Water Act, administered by the Ohio Environmental Protection Agency. Facilities of this size typically require secondary treatment as a minimum standard, with NPDES permits governing discharge limits to protect local water quality. The plant discharges treated effluent into a local receiving water body, which ultimately drains into the Ohio River watershed. This river system supports diverse aquatic life and provides drinking water for downstream communities. Proper treatment is critical to prevent nutrient pollution and maintain ecological health in the region.

The plant's discharge enters a tributary of the Ohio River, which flows into the Mississippi River and eventually the Gulf of Mexico. This watershed supports diverse aquatic species and is an important migratory corridor. The region's hilly terrain and rural character make local streams sensitive to nutrient loading and sedimentation.