All plumbing systems, materials and appurtenances, both existing and new, and all parts thereof shall be maintained in proper operating condition in accordance with the original design in a safe and sanitary condition. All devices or safeguards required by this chapter shall be maintained in compliance with the chapter edition under which they were installed. The owner or the owner's designated agent shall be responsible for maintenance of plumbing systems. To determine compliance with this provision, the Building Commissioner shall have the authority to require any plumbing system to be reinspected.