Storm Sewer System

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What is Storm Water?

Simply put, stormwater is rainfall that does not soak into the ground but instead flows over the land or in the Stormwater Sewer System to the nearest body of water, which in our case is the I&M Canal. In urban areas such as Lemont, much of the land is covered by impervious surfaces such as streets, buildings, parking lots and driveways which is why a Storm Sewer System is necessary. This water is NOT treated so it is important not to dump any chemicals, drain RV sewer waste or throw garbage into the street where they can wind up in the sewers and pollute our waterways

CSO Notices

IEPA Notice of Intent Construction Discharge Permit
MS4 Co-Permittee with DuPage
DuPage County Notice of Intent
DuPage County and Village of Lemont NPDES Intergovernmental Agreement
Lemont Combined Sewer Overflow (CSO) Public Information Handout
Soil Erosion and Sediment Control Public Information Handout
DuPage County Storm Water Management Plan

EPA Website

Illinois EPA Website
MWRDGC Combined Sewer Overflow Reporting

DuPage County Storm Water Management

Illinois EPA Division of Water Pollution Control
Annual Facility Inspection Reports

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National Pollutant Discharge Elimination System Permit IL0039551
National Pollutant Discharge Elimination System Permit ILR400497
​DuPage County Annual Report
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