This bill amends the Internal Revenue Code of 1986 to ease financing for lead service line replacement projects by modifying private business use requirements for tax-exempt bonds. Specifically, it clarifies that "qualified lead service line replacement use" will not be considered private business use for bond purposes. This means that when a public water system uses bond proceeds to replace the privately-owned portion of a lead service line, it will not trigger private business use rules, provided the replacement is to achieve or maintain compliance with a national primary drinking water regulation for lead. By removing this classification, the bill aims to make it easier and more cost-effective for communities to fund the removal of lead pipes. The amendments will apply to obligations issued after December 31, 2025 , facilitating future infrastructure investments in safe drinking water.