Maryland Code, Public Utilities § 25-213

(1) an omission or mistake previously made by the Commission; or

(2) a judgment or decree previously rendered on a property if front foot benefit charge payments have not been made on the property.

(b)(1) When the Commission discovers an omission or mistake or within a reasonable time after a court renders a judgment or decree, the Commission may impose a front foot benefit charge at a rate and in a classification that it could have imposed originally or that a court orders, including any increases applied to the project of which the property is a part, if:

(2) The front foot benefit charge imposed under this section shall run for the period of years the benefit charge would have run if it had been imposed at the proper time or in the proper manner.