A person shall obtain a permit from the Commission before the person may make a hookup with a water or sewer service line that the Commission constructs or maintains. A hookup shall be made under the conditions that the Commission authorizes. To prevent or eliminate leakage, loss of water, the unnecessary use of sewers, or other waste of water, the Commission may: at a reasonable time, enter a building or premises that has a connection with the water supply or sewer system under the jurisdiction of the Commission; and issue an order requiring a change in the plumbing, waterworks, or water or sewer connection that the Commission considers necessary.