Wyo. Stat. § 41-10-144: Exemption of property and bonds from taxation.

The effectuation of the authorized purposes of districts organized under this act shall and will be in all respects for the benefit of the people of the state of Wyoming residing within the district, for the increase of their commerce and prosperity and for the improvement of their health and living conditions; and since the districts will be performing essential governmental functions in effectuating those purposes, the districts shall not be required to pay any general (ad valorem) taxes upon any property acquired or used by them within the boundaries of the district. The bonds issued by any district, their transfer and the income therefrom shall be free from taxation within the state, except for estate taxes.