Maryland Code, Local Government § 27-204

(b)(1) The designated officer shall issue a summons to be served on each respondent.

(2) A summons may be served by publication as to any respondent who cannot be served as provided by law.

(c)(1) If a mortgage is held on land in the proposed drainage district, notice of the proceedings shall be given to the holder of the mortgage in the same manner as to a respondent.

(2) A mortgage holder may appear before the county commissioners or county council in person or by counsel.