This report presents state primacy agency reporting for each public water system's service line counts to date, in the following categories: lead, galvanized requiring replacement, lead status unknown, and non-lead service lines. The data in this report is based on the 2021 Lead and Copper Rule (LCR) Revisions initial inventory requirements, which required water systems to submit service line inventories to their state primacy agencies by October 16, 2024. Under these new requirements, state primacy agencies are currently required to report service lines for each water system by the categories listed above, however, state reporting of non-lead service lines to the EPA is currently optional. The data in this report, therefore, may not reflect actual total non-lead service line counts. The EPA estimates that there is a total of around 4 million lead service lines in the US and more information and resources on that estimate can be found by visiting the EPA's 7th Drinking Water Infrastructure Needs Survey and Assessment.

For more information on lead in drinking water, as well as the LCR requirements and compliance assistance, visit our webpages Basic Information About Lead in Drinking Water and Lead and Copper Rule Implementation Tools.