Infiltration/Inflow Control Program

Excessive infiltration and inflow (I/I) into the sanitary sewer system is a serious problem that contributes to sanitary sewer overflows (SSOs) and basement backups (BBs). The Environmental Protection Agency (EPA) and the Illinois EPA (IEPA) imposed special conditions in the National Pollutant Discharge Elimination System (NPDES) permits issued for the MWRD’s Water Reclamation Plants (WRPs) that requires tributary local separate sanitary sewer satellite entities to implement measures in addition to those required under the 1985 Sewer Summit Agreement if excessive I/I in the system causes or contributes to SSOs or BBs. Due to this mandate, the MWRD incorporated an updated Infiltration and Inflow Control Program (IICP) that was developed with the help of an Advisory Technical Panel (ATP) into the Watershed Management Ordinance (WMO).

PDF Icon Watershed Management Ordinance Article 8: Infiltration/Inflow Control Program  (118 KB)



The MWRD has developed a Technical Guidance Manual (TGM) to provide satellite entities assistance on the IICP requirements and compliance.

PDF Icon TGM Article 8: Infiltration/Inflow Control Program

TGM additional IICP Information

 

The MWRD distributes annual status reports on the Infiltration / Inflow Control Program.

PDF Icon November 2016 Annual Status Report on the Infiltration / Inflow Control Program, Volume 1

PDF Icon November 2017 Annual Status Report on the Infiltration / Inflow Control Program, Volume 2

PDF Icon November 2018 Annual Status Report on the Infiltration / Inflow Control Program, Volume 3

PDF Icon November 2019 Annual Status Report on the Infiltration / Inflow Control Program, Volume 4

PDF Icon November 2020 Annual Status Report on the Infiltration / Inflow Control Program, Volume 5

PDF Icon November 2021 Annual Status Report on the Infiltration / Inflow Control Program, Volume 6

 

Notifications
Notifications

Resources
PDF Icon I/I Information Pamphlet for Homeowners

 

A Long Term Operation and Maintenance Program and Private Sector Program outline has been developed to indicate minimum requirements and aid in the creation of these programs.

PDF Icon LTOMP and PSP Outline

Appendix D includes sample completed report forms and program templates.

PDF Icon TGM Appendix D

 

Annual Reporting Forms and SSO and BB Internal Summary Form

IICP Reporting Forms

Email the completed Annual Summary Report to mwrdii@mwrd.org.

 

Previous I/I meetings and resources:

IICP Training Workshop

Previous I/I Meetings

Links to I/I Resources

 

The IICP TGM makes references to the 1989 Manual.

Operation and Maintenance Manual for Separate Sanitary Sewer Systems, MWRD, 1989

 

If you have any questions about the Infiltration/Inflow Control Program, contact Ms. Ann Gray at (312) 751-3085, GrayA@mwrd.org, or the below address.

Ann Gray
Engineering Department - Local Sewers System Section
Metropolitan Water Reclamation District of Greater Chicago 
111 East Erie Street 
Chicago, IL 60611-2893