The city may shut off water from mains at any time without notice to any customer for repairs or other necessary purposes and shall not be responsible for any damage resulting therefrom to tanks, boilers or other property. No liability shall exist on the part of the city resulting from the breaking of mains, service pipe fittings or other appurtenances. No deductions in water rates shall be made for any time that mains or service pipes are out of use or when service is discontinued. (Prior code § 3.145)