037-1 Wyo. Code R. § 1-12
The priority of appropriation of ground water where the well was constructed prior to April 1, 1947, and the statement of claim was properly filed in the State Engineer's Office prior to March 1, 1958, shall date from the date of completion of the well. Such rights are recorded in the State Engineer's Office as Statements of Claim. The priority of appropriation of ground water where the well was constructed after April 1, 1947, but prior to March 1, 1958, and the well was properly registered in the State Engineer's Office prior to March 1, 1958, shall date from the date the water right was filed in the State Engineer's Office. Such rights are recorded as Well Registrations.
The priority date for stock and/or domestic wells completed prior to May 24, 1969 and properly filed in the State Engineer's Office on or before December 31, 1972, shall be the date the well was completed. Stock and/or domestic wells completed prior to May 24, 1969 and filed with the State Engineer's Office after December 31, 1972, shall receive the date of filing as the priority date of the water right.
The priority date of all other ground water rights, shall be the date the application to appropriate ground water is received and filed in the State Engineer's Office.
037-1 Wyo. Code R. § 1-12