The provisions of §§ 9–105 and 9–106 of this article apply to an act, an ordinance, or a resolution adopted under this section. Subject to subsection (c) of this section, the County Commissioners of Washington County may adopt, by ordinance or resolution, licensing requirements for: on–site utility contractors who perform plumbing work while installing water or sewer service; and septic system installers who place a service line between a septic tank and a building. A license issued under this section does not authorize the licensee to do plumbing work within 5 feet from a building being served. The County Commissioners of Washington County may set a license fee and require an applicant or licensee to provide a performance bond.