(7) If a connection is found on investigation not to be so defective, foul or neglected as to present a threat to human health, the environment, the reasonable conservation of water or the proper and effective management of water services, or, to permit the infiltration or exfiltration of water or waste water, the water services authority which carried out the investigation shall cause such connection to be restored and any opening or excavation made in the course of the investigation to be closed or filled up and any damage done to be made good.