The main purpose of this legislation is to require the Secretary of the Interior to conduct a study that will assess the feasibility of a project aimed at expanding the Lewis and Clark Regional Water System. This system serves areas in Iowa, Minnesota, and South Dakota, and the goal is to enhance the supply of municipal, rural, and industrial water to these regions. Key provisions of the legislation include the requirement for the Secretary to work with a non-federal project entity, specifically the Lewis and Clark Regional Water System, Inc., to carry out the feasibility study.