Md. Code, Local Government § 13–918

(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) Subject to subsection (c) of this section, the County Commissioners of

Washington County may adopt, by ordinance or resolution, licensing requirements

for:

(1) on–site utility contractors who perform plumbing work while

installing water or sewer service; and

(2) septic system installers who place a service line between a septic

tank and a building.

(c) A license issued under this section does not authorize the licensee to do

plumbing work within 5 feet from a building being served.

(d) The County Commissioners of Washington County may set a license fee

and require an applicant or licensee to provide a performance bond.