The TAAP Act reauthorizes a federal program that assesses shared groundwater resources between the United States and Mexico. The bill expands the program to include Arizona in addition to New Mexico and Texas, allowing the federal government to study and monitor transboundary aquifers in these border states. It extends the program's funding authorization through fiscal year 2035, replacing the previous authorization that expired in 2016. This legislation affects water resource management agencies, states along the U.S.-Mexico border, and communities that depend on transboundary aquifers for drinking water and agricultural purposes. The bill was introduced by senators from Arizona and Texas in September 2024 and referred to the Senate Committee on Energy and Natural Resources.