This legislation mandates the Secretary of the Interior to undertake a study, in consultation with the Dakota Mainstem Regional Water System, to determine the feasibility of constructing a project . This project aims to supply municipal, rural, and industrial water to the Dakota Mainstem Regional Water System service area, which encompasses parts of South Dakota, Iowa, Nebraska, and Minnesota. The study must adhere to reclamation feasibility standards and will be conducted through a cooperative agreement. The federal government's financial contribution to this feasibility study is limited to 50 percent of the total costs. For carrying out this section, $10,000,000 is authorized for appropriation, and the authority to conduct the study will expire 10 years after the bill's enactment.