Md. Code, Environment § 6–803

(a) This subtitle applies to:

(1) Affected property; and

(2) Notwithstanding subsection (b) of this section, any residential rental property, the owner of which elects to comply with this subtitle.

(b) This subtitle does not apply to:

(1) Property not expressly covered in subsection (a) of this section;

(2) Affected property owned or operated by a unit of federal, State, or local government, or any public, quasi-public, or municipal corporation, if the affected property is subject to lead standards that are equal to, or more stringent than, the risk reduction standard established under § 6-815 of this subtitle; or

(3) Affected property which is certified to be lead-free pursuant to § 6-804 of this subtitle.