Overview
LaSalle WWTP in Marseilles, Illinois serves approximately 12,000 people. The plant operates under the US Clean Water Act, discharging treated wastewater into the Illinois River watershed.
LaSalle WWTP is a municipal wastewater treatment facility located in Marseilles, Illinois, serving a population of about 12,000. The plant is situated in LaSalle County, part of the Illinois River basin, and plays a key role in managing local wastewater for the community. As a US facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Illinois Environmental Protection Agency. For a plant serving this population size, secondary treatment is the standard requirement, with potential additional nutrient controls depending on the receiving water body's sensitivity. The treated effluent from LaSalle WWTP ultimately discharges into the Illinois River, a major tributary of the Mississippi River. The Illinois River supports diverse aquatic life and is an important migratory corridor for waterfowl. The plant's operations contribute to protecting water quality in this ecologically significant watershed.
Environmental context
The plant discharges into the Illinois River, which flows into the Mississippi River and eventually the Gulf of Mexico. The Illinois River watershed supports diverse aquatic ecosystems, including fish and migratory birds. Nutrient management is a key concern due to downstream hypoxia in the Gulf, making treatment standards critical for regional water quality.
Frequently asked questions
LaSalle WWTP is located at 2 Grant Street, Marseilles, Illinois, in LaSalle County, United States.
The plant serves approximately 12,000 people in the Marseilles area.
The treated effluent is discharged into the Illinois River, which flows into the Mississippi River and ultimately the Gulf of Mexico.
As a US facility, LaSalle WWTP operates under the Clean Water Act and is subject to NPDES permits issued by the Illinois Environmental Protection Agency, requiring secondary treatment and compliance with water quality standards.
For a plant of this scale, secondary treatment is standard under the Clean Water Act. Depending on the receiving water body, additional nutrient removal may be required to protect downstream ecosystems.
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