1. Short title This Act may be cited as the National Dam Safety Program Amendment Act of 2024 or the NDSP Amendment Act . 2. Improvements to National Dam Safety Program (a) Definitions Section 2 of the National Dam Safety Program Act ( 33 U.S.C. 467 ) is amended— (1) by redesignating paragraph (16) as paragraph (17); and (2) by inserting after paragraph (15) the following: (16) Underserved Community The term underserved community means a community with a population of less than 50,000 that has a median household income of less than 80 percent of the statewide median household income. . (b) Rehabilitation of high hazard potential dams Section 8A of the National Dam Safety Program Act ( 33 U.S.C. 467f–2 ) is amended— (1) in subsection (c)(2), by striking subparagraph (C) and inserting the following: (C) Grant assurance As part of a grant agreement under subparagraph (B), the Administrator shall require that each eligible subrecipient to which the State awards a grant under this section provides an assurance from the dam owner, with respect to the dam to be rehabilitated, that the dam owner will carry out a plan for maintenance of the dam during the expected life of the dam. ; (2) in subsection (d)(2)(C), by striking commit and inserting for a project not including removal, obtain a commitment from the dam owner ; (3) by striking subsection (e) and inserting the following: (e) Floodplain management plans (1) In general As a condition of receipt of assistance under this section, an eligible subrecipient shall demonstrate that a floodplain management plan to reduce the impacts of future flood events from a controlled or uncontrolled release from the dam or management of water levels in the area impacted by the dam— (A) for a removal— (i) is in place; and (ii) identifies areas that would be impacted by the removal of the dam and includes a communication and outreach plan for the project and the impact of the project on the affected communities; or (B) for a project not including removal— (i) is in place