TAAP Act

What it does

• •Extends the authorization period for the United States-Mexico Transboundary Aquifer Assessment Program from fiscal years 2007-2016 to fiscal years 2026-2036.
• •Adds Arizona to the list of states whose transboundary aquifers with Mexico are eligible for assessment, excluding only the portion of Arizona aquifers within the Yuma groundwater basin as designated in 1984.
• •Updates the sunset provision to reference the new TAAP Act as the trigger for the program's expiration rather than the original 2007 legislation.

Why it matters

• •The reauthorization allows continued funding and assessment of shared aquifer resources between the U.S. and Mexico for another decade, supporting transboundary water management.
• •Including Arizona expands the geographic scope of the assessment program to address groundwater resources in a third border state with Mexico.

Who is affected

• •The United States federal government and relevant state agencies in New Mexico, Texas, and Arizona responsible for water resource management.
• •U.S. and Mexican authorities engaged in transboundary aquifer assessment and water cooperation.
• •Users of transboundary aquifer water resources in the affected border regions.

What happens next

The bill was reported by the Senate Committee on Energy and Natural Resources without amendment on November 12, 2026, and awaits further Senate consideration and House action.