Logan WWTP - Harrison County, Iowa Wastewater Treatment Plant

The Logan WWTP is a municipal wastewater treatment facility located in Harrison County, Iowa, United States. It serves a small population of approximately 1,440 residents, reflecting its role in a rural community. The plant is situated inland, away from coastal areas, and operates under the regulatory framework of the U.S. Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. The plant provides secondary treatment, a standard level required for most municipal facilities under the Clean Water Act. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant has a designed capacity of 749.51 cubic meters per day and a current discharge volume of 757.08 cubic meters per day, indicating it is operating near its capacity. As a small facility, it is subject to state-level oversight by the Iowa Department of Natural Resources. The treated effluent from the Logan WWTP is discharged into a local water body, likely a stream or river within the Missouri River basin, which ultimately drains into the Mississippi River and then the Gulf of Mexico. The plant plays a key role in protecting local water quality and downstream ecosystems by reducing pollutant loads before discharge.

The Logan WWTP discharges into a receiving water body within the Missouri River watershed, which flows into the Mississippi River and eventually the Gulf of Mexico. The local watershed supports agricultural land use and provides habitat for aquatic species. Proper wastewater treatment is essential to prevent nutrient enrichment and maintain water quality in downstream rivers and the Gulf, where hypoxia zones are a concern.