Maryland Code, Environment § 9-238

(a) A sewage sludge utilization permit expires on the date the Department sets at the time of issuance or renewal, unless the permit is renewed for another term as provided in this section.

(b) Except as provided in subsection (c) of this section, the Department may renew a sewage sludge utilization permit if the permit holder:

(c) The Department may not renew or amend a permit to install, materially alter, or materially extend a structure used for storage or distribution of any type of sewage sludge unless the Department holds a public hearing on the renewal or amendment, as provided in § 9-234.1 of this subtitle.