Maryland Code, ENVIRONMENT 6-413
(b) At least 1 month before the license expires, the Department shall send to the licensee, by first-class mail to the last known address of the licensee, a renewal notice that states:
(1) The date on which the current license expires;
(2) The date by which the renewal application must be received by the Department for the renewal to be issued and mailed before the license expires; and
(3) The amount of the renewal fee.
(c) Before the license expires, the licensee periodically may renew it for an additional 1-year term, if the business entity or public unit:
(1) Otherwise is entitled to be licensed;
(2) Pays to the Department the renewal fee that the Department sets; and
(3) Submits to the Department a renewal application on the form that the Department requires.