Edgewood STP - Advanced Wastewater Treatment in Delaware County, Iowa

Edgewood STP is an advanced wastewater treatment facility located in Delaware County, Iowa, United States. The plant serves a small population of 864 residents, reflecting its role in a rural community. It is situated inland, far from coastal areas, and operates under the regulatory framework of the U.S. Clean Water Act. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 768.44 cubic meters per day and a current discharge volume of 378.54 cubic meters per day, the facility operates well within its capacity. As a U.S. plant, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Iowa Department of Natural Resources, ensuring compliance with water quality standards. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. This region supports diverse aquatic life and is part of a larger watershed that flows into the Gulf of Mexico. The advanced treatment helps protect downstream water quality and reduces nutrient loading, which is critical for mitigating hypoxic zones in the Gulf.

The plant discharges into local streams that are part of the Upper Mississippi River basin. The Mississippi River flows southward, eventually reaching the Gulf of Mexico. This watershed supports diverse aquatic ecosystems, including fish and migratory birds. Advanced treatment at this facility helps reduce nutrient pollution, which is a key concern for the Gulf's hypoxic zone.