Wis. Stat. § 101.55
When the joint legislative council determines that it is in the interest of the state to enter into agreement with the government of the United States to provide for the discontinuance of certain of the federal government's responsibilities with respect to sources of ionizing radiation and the assumption thereof by the state pursuant to authority granted by P.L. 86-373, it shall convey its determination to the governor together with its estimate of the initial and ultimate cost of the assumption of this responsibility by the state and the governor, on behalf of the state, may, after a finding by both the governor and the U.S. nuclear regulatory commission as to the adequacy of the state's program of regulation, enter into such an agreement.
Wis. Stat. § 101.55