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12.0332 Cross-connections—Backflow prevention.

Cite as [A.S.A.C. § 12.0332]

(a) Cross-connection Prohibited. Unprotected cross-connections between the public water supply and any unapproved source of water are prohibited.

(b) Backflow Protection Required. To comply with public health rules, the utility will require the installation of approved double check valves or other approved back-flow-protection devices by and at the expense of the customer before service will be granted under any of the following conditions:

(1) Where another source of water supply is connected to the utility water system. If the customer agrees to remove all put ups and piping necessary for the utilization of this supply, the installation of backflow-protective devices will not be required;

(2) Where saltwater, or water otherwise polluted, is available for industrial or fire protection purposes;

(3) Where the premises are or may be engaged in industrial processes using or producing process waters or liquid industrial wastes, or where the premises are or may be engaged in handling sewage or any other dangerous substance;

(4) Where the circumstances are such that there is special danger of backflow of sewage or other contaminated liquids through plumbing fixtures or water-using or water-treating equipment, or storage tanks and reservoirs.

(e) Plumbing Changes Required. In special circumstances, when the customer is engaged in the handling of especially dangerous or corrosive liquids, or industrial or process waters, the utility may require the customer to eliminate certain plumbing or piping connections as an additional precaution and as a protection to the backflow-prevention devices. In making plumbing connections the customer shall be guided entirely by local building codes and not by the utility.

(d) Relief Valve Required. As a protection to the customer’s plumbing system a suitable pressure relief valve must be installed and maintained by lain, at his expense, when cheek valves or other protective devices are used. The relief valve shall be installed between the check valves nil the water heater.

(e) Backflow Protection on All Lines. Whenever backflow protection has been found necessary on a water simply line entering a customer’s premises, then any and all water supply lines from the utility’s mains entering such premises buildings or structures shall be protected by an approved backflow device, regardless of the use of the additional water supply lines.

(f) Interstreet Main Flow Protection.

(1) Two or more services supplying water from different street mains to the same building structure or premises through which an interstreet main flow may occur, shall have a standard cheek valve on each water service to be located adjacent to and on the property side of the respective meters.

(2) Such check valves shall not be considered adequate if backflow protection is deemed necessary to protect the utility’s mains from pollution or contamination, but the installation of approved dual backflow devices at such meters shall take the place of, and satisfy the requirement for, standard check valves.

(g) Inspection and Maintenance.

(1) The double check valve or other approved backflow protection devices may be inspected and tested periodically for water tightness by the utility.

(2) The owner of any premises on which or on account of which check valves or other protective devices are installed, shall inspect these devices for water tightness and reliability at least every 3 months. The devices shall be serviced, overhauled, or replaced whenever they are found defective and all costs of repair and maintenance shall be borne by the customer.

(h) Discontinuance of Service. The service of water to any premises may be immediately discontinued by the utility if any defect is found in the cheek valve installations or other protective devices, or if it is found that dangerous, unprotected cross-connections exist. Service will not be restored until such defects are corrected.

History: Rule 11-81 eff 1 Aug 81 Art. 2 § 22(A-H).