Lead Service Line Inventories

The Iowa DNR's lead service line inventory template is now available. All public water supply systems that are classified as community water systems (CWSs) and non-transient non-community (NTNC) water systems are required to submit their lead service line inventories to the Iowa DNR by October 16, 2024. This template will include the information required by the Iowa DNR for lead service line inventories.

If you are a system who has less than 10,000 service lines, please use the Iowa Lead Service Line Inventory Small File (3,5 MB).  If you are a system who has 10,000 or more service lines, please use the Iowa Lead Service Line Inventory Large File (57.7 MB).  The Iowa Lead Service Line Large File (57.7 MB) may take a few minutes to download.

Please email LCRR@dnr.iowa.gov if you are unable to open the Excel file.

• Iowa Lead Service Line Inventory Small Template (3.5 MB)
• Iowa Lead Service Line Inventory Large Template (57.7 MB)

In 1986, Congress amended the SDWA to prohibit the use of pipes, solder or flux that are not “lead free” in public water systems or plumbing in facilities providing water for human consumption. At the time, lead free was defined as solder and flux with no more than 0.2 percent lead and pipes with no more than 8.0 percent lead.

In 1996, Congress further amended the SDWA to prohibit the use of pipe and plumbing fittings and fixtures that are not lead free in the installation and repair of any public water system or plumbing in a facility providing water for human consumption. The 1996 amendments also required lead free plumbing fittings and fixtures (endpoint devices) to be in compliance with a lead leaching standard.

States were required to enforce the lead ban by June of 1988.

If a home was constructed after 1988 in Iowa, it is expected that the service line for that home was constructed using material other than lead. Public water supply systems developing their lead service line inventories may designate homes built after 1988 as not having a lead service line in their inventory.

Local ordinances or codes may also provide a time frame that can be used in service line material determinations.

In February of 2022, the Association of State Drinking Water Administrators (ASDWA) held a series of eight 90-minute online sessions about various topics related to lead service line inventory work. Community and non-transient non-community public water supply systems are required to submit service line inventories as a result of the Lead and Copper Rule Revisions. Resources from these sessions can be found on ASDWA’s website, or can be accessed through the table below.