Wyo. Stat. § 15-7-601
Any city or town owning its municipal water system or plant may enter into agreements with the owners of lands who desire to have the water system extended to their property within the corporate limits of the city or town. The land owners shall agree to pay to the city or town a stipulated amount, in installments as may be agreed upon, for a period not to exceed ten (10) years, regardless of the use or nonuse of water during the period, and to making the charges a lien upon their respective lands. When the agreement has been filed with the city or town clerk, the charges become a lien upon the lands. Any city or town, by ordinance, may prescribe the rules and regulations governing the agreements and provide for the enforcement of the lien.
W.S. 15-7-601