S. 3736 requires the U.S. Secretary of the Interior to study whether it is feasible to build a water supply project for the Dakota Mainstem Regional Water System, which would serve municipal, rural, and industrial water needs across parts of South Dakota, Iowa, Nebraska, and Minnesota. The study must follow federal reclamation standards and be conducted in partnership with the Dakota Mainstem Regional Water System through a cooperative agreement. The federal government would cover up to 50 percent of the study's costs, with $10 million authorized for this purpose, and the study authority expires 10 years after the bill's enactment. This legislation, introduced by senators from South Dakota in January 2026, is limited to the feasibility assessment phase and does not commit to actual construction of the project.
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