Iron Ridge WWTP - Secondary Treatment Plant in Iron Ridge, Wisconsin

Iron Ridge WWTP is a municipal wastewater treatment facility located in Iron Ridge, Dodge County, Wisconsin. The plant serves a population of approximately 1,130 residents, classifying it as a small-scale treatment facility under U.S. regulatory frameworks. The plant provides secondary treatment, which is the standard requirement under the U.S. Clean Water Act for municipal wastewater facilities. Secondary treatment typically involves biological processes to remove organic matter and suspended solids. The plant has a designed capacity of 582.95 m³/day and currently discharges 378.54 m³/day of treated effluent. The treated wastewater from Iron Ridge WWTP is discharged into local streams that are part of the Rock River basin, which ultimately flows into the Mississippi River. This downstream connection highlights the plant's role in protecting water quality in a major U.S. watershed, supporting aquatic life and recreational uses.

The plant discharges into tributaries of the Rock River, which flows southward through Wisconsin and Illinois before joining the Mississippi River. The Rock River watershed supports diverse aquatic habitats and is important for regional biodiversity. The plant's secondary treatment helps reduce nutrient and organic pollutant loads, protecting downstream water quality in the Mississippi River system.