The Transboundary Aquifer Assessment Program Act reauthorizes and updates a program that studies shared groundwater resources between the United States and Mexico. The bill expands the program's focus to include Arizona in addition to New Mexico and Texas (with a specific exception for certain groundwater basins near Yuma), allowing these states to participate in transboundary aquifer assessments. The legislation provides $1.5 million annually for fiscal years 2026 through 2033 to support the program's research and monitoring activities. This reauthorization extends the program's authority, which had previously been set to expire, enabling continued cooperation with Mexico on managing shared underground water supplies that are critical for agriculture, drinking water, and other uses in border regions.
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