It shall be the responsibility of the owner of a building or premises to maintain all water piping and fixtures on the owner's property in good repair and free from leakage of water. In case of leakage or faulty plumbing resulting in unnecessary waste of water, the owner shall make necessary repairs promptly on notice from the Director of Public Works. On failure to do so within the time specified, the water supply will be discontinued until such repairs are made and approved, after notice and an opportunity for a hearing in the same manner as provided for in § 50.021.