Overview
CORALVILLE STL serves approximately 19,305 residents in Coralville, Iowa. The plant operates under the US Clean Water Act, discharging treated wastewater into the Iowa River watershed.
CORALVILLE STL is a municipal wastewater treatment plant located on Camp Cardinal Road in Coralville, Johnson County, Iowa. It serves a population of about 19,305 people, placing it in the medium-agglomeration category for US facilities. As a US plant, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Iowa Department of Natural Resources. For a community of this size, secondary treatment is the minimum standard, with potential for additional nutrient removal to protect downstream water quality. The plant's treated effluent discharges into the Iowa River, a tributary of the Mississippi River. This watershed supports diverse aquatic life and provides recreational and drinking water resources. The plant's location inland reduces direct marine impact, but its discharge contributes to the overall nutrient load in the Mississippi River Basin, which ultimately reaches the Gulf of Mexico.
Environmental context
The plant discharges into the Iowa River, which flows southeast to join the Mississippi River near the Illinois border. The Mississippi River then drains into the Gulf of Mexico. This watershed is ecologically important, supporting fish species such as catfish and bass, and providing habitat for migratory birds. Nutrient management is a key concern due to the Gulf of Mexico hypoxic zone, making treatment performance critical for downstream ecosystem health.
Frequently asked questions
CORALVILLE STL is located on Camp Cardinal Road in Coralville, Johnson County, Iowa, United States.
The plant serves approximately 19,305 people, classifying it as a medium-sized municipal wastewater treatment facility.
Treated effluent from CORALVILLE STL is discharged into the Iowa River, which flows into the Mississippi River and ultimately reaches the Gulf of Mexico.
As a US facility, CORALVILLE STL operates under the Clean Water Act and is regulated through the National Pollutant Discharge Elimination System (NPDES), with permits typically issued by the Iowa Department of Natural Resources.
For a community of this size, secondary treatment is standard under the Clean Water Act. Many plants in the region also incorporate nutrient removal to address downstream water quality concerns in the Mississippi River Basin.
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