MOULTON STL Wastewater Treatment Plant, Moulton, Iowa

MOULTON STL is a municipal wastewater treatment plant located on 545th Street in Moulton, Appanoose County, Iowa. It serves a small community of approximately 605 residents, reflecting the rural character of the region. The plant operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment as the minimum standard for municipal wastewater facilities. The plant provides secondary treatment, a biological process that significantly reduces organic matter and suspended solids. With a designed capacity of 643.52 and an average discharge volume of 870.65, the facility manages the wastewater generated by the local population. As a small-scale plant, it is subject to state-level permitting through Iowa's Department of Natural Resources, which oversees compliance with National Pollutant Discharge Elimination System (NPDES) requirements. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. This connection to a major river system underscores the importance of effective treatment to protect downstream water quality. The plant's inland location, far from coastal areas, reduces direct marine impact but emphasizes the need to safeguard freshwater ecosystems in the region.

The plant discharges into local streams that are part of the Mississippi River watershed, one of the largest drainage basins in North America. These waters flow through agricultural and rural landscapes before reaching the Gulf of Mexico. The treatment plant helps protect downstream aquatic habitats by reducing nutrient and pollutant loads, which is critical for preventing eutrophication and maintaining biodiversity in the river system.