Lead Service Line Information

In January 2017, PA 99-0922 amended the Illinois Environmental Protection Act (415 ILCS 5/et seq) to require annual service line material inventories. This provision also provides for disturbance notifications.

From Sec. 17.11. Lead in drinking water notifications and inventories(Source: P.A. 99-922, eff. 1-17-17.)

(c) The owner or operator of each community water system in the State shall develop a water distribution system material inventory that shall be submitted in written or electronic form to the Agency on an annual basis commencing on April 15, 2018 and continuing on each April 15 thereafter until the water distribution system material inventory is completed. In addition to meeting the requirements for water distribution system material inventories that are mandated by the United States Environmental Protection Agency, each water distribution system material inventory shall identify:

(1) the total number of service lines within or connected to the distribution system, including privately owned service lines;
(2) the number of all known lead service lines within or connected to the distribution system, including privately owned lead service lines; and
(3) the number of the lead service lines that were added to the inventory after the previous year's submission.
Nothing in this subsection shall be construed to require that service lines be unearthed.

Illinois EPA and DoIT established a web service for the Responsible Operators In Charge of the respective community water supplies to load their summary data into.  In the future, Illinois EPA will audit the inventories as part of our routine evaluations of community water supplies as described below.  

Summary of Public Water Supply Service Line Material Inventories

The following provides a preliminary report of what we know about service lines in Illinois.

  • 1,515 of 1,740 Community Water Supplies have reported inventory information.

  • Of the 3,563,021 total services lines reported, the material inventory breakdown is as follows:

    • 378,374 Lead; 

    • 305,060 Copper potentially with lead solder; 

    • 1,456,323 Unknown material;

    • 65,131 Galvanized;

    • 1,157,126 Copper without lead solder; and

    • 201,007 Plastic.

Note:  In 2019, Illinois EPA will report two additional material categories (Ductile/Cast Iron and Transite) to account for large diameter service lines or water main reporting for wholesale systems. Water systems were instructed to report these material types as "unknown" for the 2018 reporting cycle. This future reporting modification will reduce this category in the material inventory by approximately 10,000 services. Additionally, several water systems indicated they will significantly reduce the unknown category in 2019 through confirmatory work being conducted in 2018. Finally, water systems have indicated they do not have lead service lines; however, they did not track the customer owned portion of service line replacements although they know lead was not used. This resulted in reporting the service line as unknown (which may overestimate the amount of lead present). Therefore, the Illinois EPA may split the Unknown Material class into two classes in 2019 (e.g., Unknown and Material other than Lead.) 

Illinois EPA is currently working on the development of a water system web interface that consumers can use to determine the material types being used for service lines connected to their respective water system.