Overview
Mason City WWTP serves approximately 29,000 residents in Mason City, Iowa. The facility operates under the U.S. Clean Water Act, treating municipal wastewater before discharge into local waterways.
Mason City WWTP is a municipal wastewater treatment facility located in Mason City, Cerro Gordo County, Iowa. Serving an estimated population of 29,040, the plant is part of the city's essential infrastructure for managing wastewater from residential and commercial sources. As a U.S. facility, the plant operates under the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. For a plant serving this population size, secondary treatment is typically mandated, with additional nutrient removal requirements in sensitive watersheds. The plant's treatment processes and capacity details are not publicly available, but regulatory compliance ensures proper treatment standards. The treated effluent is discharged into the Winnebago River, which flows into the Shell Rock River, then the Cedar River, and eventually the Mississippi River. This watershed supports diverse aquatic life and provides recreational and drinking water resources downstream. The plant plays a key role in protecting water quality in the region.
Environmental context
The plant discharges into the Winnebago River, a tributary of the Shell Rock River, which joins the Cedar River and ultimately flows into the Mississippi River. This watershed drains agricultural and urban areas, and the plant's nutrient removal helps mitigate downstream eutrophication risks in the Mississippi River Basin and the Gulf of Mexico hypoxic zone.
Frequently asked questions
Mason City WWTP is located on Spruce Avenue in Mason City, Cerro Gordo County, Iowa, United States.
The plant serves approximately 29,040 residents in the Mason City area.
The treated effluent is discharged into the Winnebago River, which flows through the Shell Rock and Cedar Rivers to the Mississippi River.
As a U.S. facility, it operates under the Clean Water Act, requiring an NPDES permit issued by the Iowa Department of Natural Resources, which sets limits on pollutants to protect water quality.
For a plant of this size, secondary treatment is standard, and many facilities also incorporate nutrient removal to address downstream impacts on the Mississippi River and Gulf of Mexico.
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