Wyo. Stat. § 15-6-439
The owner of any lot, tract or parcel of land or other property charged with any assessments may redeem it from all or any portion of the liability for the contract price of the improvement by paying the entire assessment or any portion thereof charged against the lot or parcel of land, without interest, within thirty (30) days after notice to him of the assessment unless the legal owners of record of all of the property assessed in the district have waived this thirty (30) day period. Unless the legal owners of record of all property assessed in the district waive the thirty (30) day cash payment period, the city or town treasurer, as soon as the assessment roll has been placed in his hands for collection, shall publish the notice in a newspaper of general circulation within the city or town. The notice shall be published once a week for two (2) consecutive weeks and shall specify that the roll is in his hands for collection and that any assessment thereon or any portion of any assessment may be paid at any time within thirty (30) days from the date of the first publication of the notice without penalty, interest or costs. Bonds may be issued prior to the expiration of the thirty (30) day period but only if the legal owners of all of the property assessed in the district have waived the thirty (30) day cash payment period, and bonds may be issued at any time after the expiration of the thirty (30) day period. The governing body may provide that the owner of any lot or parcel of land may redeem it from all liability for the unpaid amount of the assessment at any time after the thirty (30) days, if applicable, by paying all the installments of the assessment remaining unpaid, with interest thereon to the date of the maturity of the installment next falling due. If any sum is paid as provided in this section, it shall be paid to the city treasurer, or to the officer whose duty it is to collect the assessments, and all sums so paid shall be applied solely to the payment of the cost and expense of the improvements or to the redemption of the bonds issued.
W.S. 15-6-439