NASHUA WWTP - Secondary Wastewater Treatment in Nashua, Iowa

NASHUA WWTP is a municipal wastewater treatment plant located at 1050 Jay Street in Nashua, Iowa, United States. The facility serves a population of approximately 1,476 residents in the Chickasaw County area, operating as a secondary treatment plant under the regulatory framework of the US Clean Water Act. The plant's designed capacity is 794.93 thousand cubic meters, with an annual discharge volume of 454.25 thousand cubic meters. As a secondary treatment facility, it employs biological processes to reduce organic matter and suspended solids, meeting the standard requirements for municipal wastewater treatment in the United States. The plant is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. This inland location, more than 50 km from the coast, means the plant's discharge contributes to freshwater systems that support diverse aquatic life and are used for recreation and drinking water downstream. The plant plays a key role in maintaining water quality in the region's watershed.

The plant discharges into the Upper Mississippi River basin, which flows southward to the Gulf of Mexico. The receiving waters support a variety of fish and wildlife, including migratory birds and freshwater mussels. The watershed is part of a larger agricultural region, where nutrient management is critical to prevent downstream hypoxia in the Gulf.