Wyo. Stat. § 41-9-103: What lands may be included.

Said territory need not be contiguous, provided, that it be so situated that the public health or welfare will be promoted by such drainage of each part thereof, and the benefits of the proposed work in each part will exceed the damages from and costs of said proposed work in each part; and provided, further, that the court shall be satisfied that said proposed work can be more cheaply done if in a single district than otherwise.