Md. Code, Local Government § 13–917

(a) The provisions of §§ 9–105 and 9–106 of this article apply to an act, an

ordinance, or a resolution adopted under this section.

(b) The County Commissioners of Washington County may adopt an

ordinance or resolution to license household appliance installers to perform plumbing

work incident to the installation of home appliances.

(c) The County Commissioners of Washington County may require a license

fee and a performance bond before granting a license.