All water service pipes and their connections to the water system must be inspected and approved in writing by the superintendent before they are covered, and he shall keep a record of such approvals. If he refuses to approve the work, the plumber or property owner must proceed immediately to correct the work so that it will meet with his approval. Every person who uses or intends to use the municipal water system shall permit the superintendent to enter the premises to inspect or make necessary alterations or repairs at all reasonable hours and on proof of authority.