H.R. 5874, the Transboundary Aquifer Assessment Program Act (TAAP Act), renews and updates a federal program that studies underground water sources shared by the United States and Mexico. The bill amends the original 2006 law to expand the list of priority aquifers eligible for study, adding Arizona to the previously included states of New Mexico and Texas, though it specifically excludes the aquifer beneath the Yuma groundwater basin along the Arizona-Sonora border. It also extends funding authorization for the program through fiscal years 2025 through 2032, replacing the expired 2007-2016 authorization period. Additionally, the bill updates the program's sunset provision to reflect the new legislation's enactment date rather than the original 2006 law. This measure primarily affects water resource agencies, researchers, and communities in border states who rely on accurate data about shared groundwater supplies for planning and management purposes.
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