HENDERSON STL Wastewater Treatment Plant, Henderson, Iowa

HENDERSON STL is a municipal wastewater treatment plant located in Henderson, Mills County, Iowa, United States. The facility serves a small population of 171 residents, reflecting its role in a rural community. The plant is situated inland, far from coastal influences, and operates under the regulatory framework of the US Clean Water Act. The plant provides secondary treatment, a standard level for small communities in the United States. With a designed capacity of 113.56 m³/day and a current discharge volume of 75.71 m³/day, the facility operates below its capacity. Under the US EPA National Pollutant Discharge Elimination System (NPDES), plants of this scale are typically required to meet secondary treatment standards to protect water quality. The treated effluent is discharged into a local water body, which ultimately drains into the Missouri River watershed. The Missouri River flows into the Mississippi River, eventually reaching the Gulf of Mexico. The plant's discharge contributes to the overall water quality management in the region, supporting downstream aquatic ecosystems and recreational uses.

The plant discharges into a local water body within the Missouri River basin, which flows into the Mississippi River and ultimately the Gulf of Mexico. The watershed supports diverse aquatic life and is important for regional agriculture and recreation. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality in this ecologically sensitive river system.