Lead pipe inventories reveal progress, challenges in Wisconsin
(UI) - Updated water system inventories indicate Wisconsin has fewer lead service lines than previously estimated, but utilities still face a significant challenge in identifying and replacing aging infrastructure. According to a Wisconsin Watch analysis, approximately 164,000 lead service lines remain statewide, including confirmed lead pipes and an estimated share of service lines with unknown materials that are likely to contain lead.
The updated figures are substantially lower than earlier estimates as utilities complete detailed inventories required under the EPA's revised Lead and Copper Rule. Water systems were required to submit initial service line inventories in 2024, giving regulators line-by-line records for the first time and helping utilities better target replacement efforts.
Despite the progress, more than 181,000 Wisconsin service lines remain classified as unknown material. By November 2027, utilities must improve those records or treat unknown lines as lead under federal regulations, triggering replacement requirements, Wisconsin Watch reported. Smaller systems have faced particular challenges due to incomplete historical records and limited documentation of older infrastructure.
Utilities across Wisconsin are using a combination of historical records, field inspections and excavation work to identify remaining lead pipes. Federal funding continues to support replacement efforts, with more than $159 million already awarded through the Bipartisan Infrastructure Law and an additional $94.3 million allocated to Wisconsin this year for lead service line projects.
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