Who is affected and how:

• Public water systems and local governments: They benefit most because they can structure tax-exempt bond financings to cover replacement of entire service lines (including privately owned sections) without causing the bonds to be treated as private activity bonds. This expands financing flexibility for community lead-remediation projects and can lower borrowing costs.

• Homeowners and other property owners with privately owned lead service-line sections: They may gain faster or more affordable replacement options because projects that replace private-side piping can be financed with tax-exempt debt rather than higher-cost alternatives.

• Municipal bond issuers, bond counsel, and underwriters: They will need to apply the new statutory definitions in financing documents and disclosures. The change reduces legal risk that financed private-side replacements would trigger private business use problems, but follow-up documentation and possibly IRS guidance will be required.

• Taxpayers and investors in municipal bonds: Indirectly affected—preserving tax-exempt status tends to reduce borrowing costs for issuers and maintain attractiveness of those bonds to tax-exempt investors; federal tax receipts are not directly changed by the provision itself.

• Regulators and program administrators: State and federal water program administrators may coordinate financing approaches with utilities and local governments to take advantage of this tax treatment.

Overall effect: The amendment removes a specific tax-law obstacle to using tax-exempt bond financing for lead service line replacements that include privately owned portions, likely increasing access to lower-cost capital for public-health work while leaving other tax rules and funding structures unchanged.