Where application is made for a supply of water for premises situated at a level above that which can be efficiently serviced by the normal pressure in a local authority main, or where a supply is required for such premises, the applicant or consumer shall accept the supply from the local authority at such pressure as is available at the site of such premises, and the applicant or consumer shall be responsible for the provision and maintenance of adequate water-supply to the services on such premises to the approval of the local authority.