A. 
Master plumber licenses. The holder of a master plumber license issued by either the State of Maryland or Harford County, Maryland, is eligible to secure permits and has authority to perform plumbing, on-site sewer, water system and disposal systems in the City of Havre de Grace, and may employ registered journeymen and apprentices.
B. 
Journeyman plumber license. The holder of a journeyman plumber license is eligible for employment in the plumbing business for, and under the direction of, a registered master plumber.
C. 
Master limited plumber license. When issued by the State of Maryland, this license shall permit a corporation, firm or company not primarily engaged in the plumbing business to do plumbing work limited to maintenance and repair, alterations and minor extension of existing plumbing systems on the premises occupied by it in connection with its primary business.
D. 
Master gas-fitter license. The holder of a master gas-fitter license issued by Harford County, Maryland, or the State of Maryland is eligible to secure permits and has authority to perform gas-fitting work and may employ journeyman gas fitters and apprentices.
E. 
Journeyman gas-fitter license. The holder of a journeyman gas-fitter license is eligible for employment in the gas-fitting business for and under the direction of a registered master gas fitter.
F. 
Water pump contractor's license. When issued by the State of Maryland or Harford County, Maryland, this license shall permit a person to install water pumps in wells, springs and cisterns and to connect such pumps to the water system of any building used for human occupancy and to secure permits for such work.
A. 
The administrative authority may, in its discretion, suspend or revoke the business privileges of any person who shall make any false or misleading statement in an application, or who shall sell, lend or otherwise permit any improper use of a license, or who shall obtain permits for others to do plumbing or gas-fitting work, or who shall fail to maintain a regular place of business.
B. 
Upon receipt of written requests directed to the administrative authority, the administrative authority, in its discretion, may suspend or revoke the business privileges of any person who has been found guilty of committing any violation specified in this § 134-6 of this chapter or any other law or regulation governing the conduct of the plumbing and gas-fitting business.
C. 
No such business privileges shall be suspended or revoked except after public hearing before the administrative authority, of which the license holder shall receive at least five days' notice in writing, together with a statement of the charges. Upon such hearing, the administrative authority may suspend any such privileges for such a period of time as it may find proper, or revoke the same.
D. 
In the event of a revocation, no application for the reinstatement of such business privileges shall be entertained until the expiration of six months from the date of such revocation. At the end of such six-month period, the administrative authority may, in its discretion, reinstate revoked privileges.
A. 
No person shall engage in plumbing or gas fitting as defined in this chapter in Havre de Grace, Maryland, unless that person has been duly authorized to do so by the issuance of one of the foregoing licenses. No person shall do or perform any plumbing or gas-fitting work not authorized under an issued license.
B. 
The provisions of this section shall not apply to persons working under the supervision of a master limited plumber - gas fitter on its premises, to persons working on on-site utility work under the supervision of a registered professional engineer, to persons working on disposal systems under a permit issued by the Harford County Health Department, or to persons working on water pumping systems under the supervision of a water pump contractor.
C. 
A plumbing permit required by the administrative authority may be issued to a bona fide owner of a single-family dwelling occupied exclusively by the owner to do any plumbing work regulated by this code on the dwelling, on condition that such work is done in compliance with this code.