Wyo. Stat. Ann. § 15-6-442

If any local assessment or installment thereof is paid, or any certificate of sale redeemed, or any judgment paid by any joint owner of any property assessed for any local improvement, the joint owner, after demand and refusal, by an action brought in the district court, may recover from each of his coowners the amounts of the payment which each coowner should bear, with interest thereon at ten percent (10%) per year from the date of the payments, and the costs of the action. The joint owner making payment has a lien upon the undivided interest of his coowners in the property from date of payment.