Md. Code, Public Utilities § 18–115

(a) Each merit system employee is entitled to the number of days of annual leave with pay that the Commission specifies by regulation.

(b) The number of days of annual leave with pay specified by a regulation adopted under this section shall be:

(1) at least 10 days but not more than 30 days in a calendar year; and

(2) generally consistent with the annual leave schedules provided by other governmental agencies in the area of the sanitary district.