Harpers Ferry WWTP | Secondary Treatment Plant in Harpers Ferry, Iowa

Harpers Ferry WWTP is a municipal wastewater treatment facility located in Harpers Ferry, Iowa, a small community in Allamakee County. The plant serves a population of approximately 330 residents and is part of the region's essential water infrastructure. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 416.39 million gallons per year and an actual discharge volume of 113.56 million gallons per year, the facility operates well below its capacity. As a U.S. plant, it is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged into a local water body, likely a tributary of the Upper Mississippi River basin. The Mississippi River downstream supports diverse aquatic life and is a critical migratory corridor for birds and fish. The plant's secondary treatment helps reduce organic pollutants and suspended solids, contributing to the ecological health of the watershed.

The plant discharges into a local watercourse that drains into the Upper Mississippi River, a major river system flowing into the Gulf of Mexico. The Mississippi River supports a wide range of aquatic species and serves as an important migratory route for waterfowl and fish. The watershed is predominantly agricultural, and the plant's secondary treatment helps mitigate nutrient loading that could contribute to downstream hypoxia in the Gulf.