This Act may be cited as the Transboundary Aquifer Assessment Program Act or the TAAP Act.

(a) Designation of priority transboundary aquifers Section 4(c)(2) of the United States-Mexico Transboundary Aquifer Assessment Act (42 U.S.C. 1962U.S. Code — Title 42, Section 1962View official source on GovInfo note; Public Law 109–448Public Law 109-448View official source on GovInfo) is amended by striking New Mexico or Texas and inserting New Mexico, Texas, or Arizona (other than an aquifer underlying Arizona and Sonora, Mexico, that is partially within the Yuma groundwater basin designated by the order of the Director of the Arizona Department of Water Resources dated June 21, 1984). (b) Authorization of appropriations Section 8(a) of the United States-Mexico Transboundary Aquifer Assessment Act (42 U.S.C. 1962U.S. Code — Title 42, Section 1962View official source on GovInfo note; Public Law 109–448Public Law 109-448View official source on GovInfo) is amended by striking $50,000,000 for the period of fiscal years 2007 through 2016 and inserting $1,500,000 for each of fiscal years 2026 through 2033. (c) Sunset of authority Section 9 of the United States-Mexico Transboundary Aquifer Assessment Act (42 U.S.C. 1962U.S. Code — Title 42, Section 1962View official source on GovInfo note; Public Law 109–448Public Law 109-448View official source on GovInfo) is amended by striking enactment of this Act and inserting enactment of the Transboundary Aquifer Assessment Program Act.