Wyo. Stat. § 37-13-116
Notice of a public hearing on the proposed assessment resolution shall be given. At least twenty (20) days before the date fixed for the hearing, the notice shall be published one (1) time in a newspaper in which the first notice of hearing was published. Notice shall also be mailed to each owner of real property whose property will be assessed for part of the cost of the improvement at the last known address of the owner as shown on the last completed real property assessment rolls of the county wherein the affected property is located. In addition, a copy of the notice shall be addressed and mailed to "owner" at the street number of each piece of property affected by the assessment. Each notice shall state that at the specified time and place the governing body will hold a hearing upon the proposed assessments and that the owner of any property to be assessed pursuant to the resolution will be heard on the question of whether his property will be benefited by the proposed improvement to the amount of the proposed assessment against his property and whether the amount assessed against his property constitutes more than his proper proportional share of the total cost of the improvement. The notice shall further state that the owner or owners of any property assessed must file a written objection pursuant to section 37-303 [§ 37-13131] of the statutes if the owner or owners wish to do the trenching and backfilling on their own property outside of utility easements and thereby not be obligated to pay the public utility therefor, if such is permitted by the district and public utility tariff. The notice shall further state where a copy of the proposed resolution levying the assessments against all real property in the district is on file for public inspection, and that subject to such changes and corrections as may be made by the governing body, it is proposed to adopt the resolution at the conclusion of the hearing. The published notice shall describe the boundaries or area of the district with sufficient particularity to permit each owner of real property therein to ascertain that his property lies in the district. The mailed notice may refer to the district by name and date of creation and shall state the amount of the assessment proposed to be levied against the real property of the person to whom the notice is mailed. In the absence of fraud, the failure to mail any notice does not invalidate any assessment or any proceeding under this chapter.
W.S. 37-13-116