037-2 Wyo. Code R. § 2-12
The Certificate of Ownership provides proof of land ownership for the purpose of adjudication. The Certificate of Ownership is usually a Certificate from the County Clerk, but it could be some other document such as, a copy of the warranty deed or land contract. If the lands involved are being purchased by the appropriator, a consent to the adjudication must be submitted by the sellers when the final proof is submitted. If the ownership is joint in nature, all co-owners must either join in as co-appropriators or consent to the adjudication.
When all or part of the lands involved are owned by a federal agency, some written documentation authorizing access to the lands (i.e., special use permit, lease, etc.) must be provided. If the lands involved are State of Wyoming lands, both the names of the appropriator-lessee and the State of Wyoming-lessor will appear on the final proof.
In some cases where ground water has been appropriated for industrial use (i.e., secondary recovery operations, mineral exploration or mineral development) a copy of the executed mineral lease or those portions of the executed Unit Agreement which describe the land(s) involved will serve as a Certificate of Ownership.
037-2 Wyo. Code R. § 2-12