15-6-440. Payment of assessments; installment collection. Unless the assessment against any parcel is paid within thirty (30) days after the notice, or the thirty (30) day period has been waived by the legal owners of record of all of the property assessed in the district, the assessment shall be collected in installments as provided in W.S. 15-6-409 and 15-6-432. Each installment is delinquent unless paid when due.
Wyoming Legal Code