A Combined Sewer is a type of sewer system that collects both sanitary sewage and stormwater runoff in a single pipe system. Combined Sewer Systems can cause serious water pollution problems due to combined sewer overflows, which are caused by large variations in flow between dry and wet weather conditions. This type of sewer design is no longer used in new construction, but many of the older areas still utilize this type of system. The Village of Lemont has dedicated itself to going into some of the more historic areas and separating the combined systems into separate, sanitary and storm systems.

Resources

CSO Outfall 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
• Summary of Lemont Sanitary and Storm Sewer Information Handout
• DuPage County Storm Water Management Plan
• February 2024 DuPage County Public Comment Press Release - Water Quality Program

EPA Website

Illinois EPA Website

MWRDGC Combined Sewer Overflow Reporting

DuPage County Storm Water Management

2024 DuPage County Virtual Public Meeting Space 

Illinois EPA Division of Water Pollution Control Annual Facility Inspection Reports

• 2018 IEPA Annual Facility Inspection Report
• 2017 IEPA Annual Facility Inspection Report
• National Pollutant Discharge Elimination System Permit IL0039551
• National P2024 DuPage County Virtual Public Meeting Spaceollutant Discharge Elimination System Permit ILR400497

DuPage County Annual Report

• 2020 DuPage County Annual Permit
• 2019 DuPage County Annual Permit
• 2018 DuPage County Annual Permit
• 2017 DuPage County Annual Report
• 2016 DuPage County Annual Report
• 2015 DuPage County Annual Report

Free viewers are required for some of the attached documents.
They can be downloaded by clicking on the icons below.

Acrobat Reader Windows Media Player Word Viewer Excel Viewer PowerPoint Viewer