(A) Backflow prevention devices shall be installed in connection with water service connections or within any premises where, in the judgment of the City, the nature and extent of the activities, or the materials stored on the premises, would present an immediate and dangerous hazard to health and/or be deleterious to the quality of the water should a cross connection occur, even though such cross connection does not exist at the time the backflow prevention devices shall be installed under circumstances including but not limited to the following:
1. Premises having an auxiliary water supply, unless the quality of the auxiliary supply is in compliance with Idaho Code, and all standards, rules and regulations of the State of Idaho, the Idaho Department of Health and Welfare, and any other Federal, State, County or City authority or agency thereof and is acceptable to the City.
2. Premises having internal cross connections that are not correctable, or intricate plumbing arrangements which make it impracticable to ascertain whether or not cross connections exist.
3. Premises where entry is restricted so that inspections for cross connections cannot be made with sufficient frequency or at sufficiently short notice to insure that cross connections do not exist.
4. Premises having a repeated history of cross connections being established or re-established.
5. Premises on which any substance is handled under pressure so as to permit entry into the City water supply, or where a cross connection could reasonably be expected to occur. This shall include the handling of process waters and cooling waters.
6. Premises where materials of a toxic or hazardous nature are handled in such a way that if back siphonage should occur, a serious health hazard might result.
7. The following types of facilities will fall into one of the above categories where a backflow prevention device is required to protect the City water supply. A backflow prevention device shall be installed at these facilities unless the City and applicable State, County and Federal authorities and agencies determine that no hazard exists:
a. Hospitals, mortuaries, clinics.
b. Laboratories, including school laboratories.
c. Metal plating industries.
d. Sewage treatment plants.
e. Food or beverage processing plants.
f. Chemical plants using a water process.
g. Petroleum processing or storage plants.
h. Car washes.
i. Dry cleaners.
8. Other premises as specified by the City, where backflow prevention devices are required to protect the City water supply.
(B) The type of protective device required shall depend on the degree of hazard which exists.
1. An air-gap separation or a reduced pressure principle backflow prevention device shall be installed where the City water supply may be contaminated with sewage, industrial waste of a toxic nature, or other contaminant which could cause a health or system hazard.
2. In the case of a substance which may be objectionable but not hazardous to health, a double check valve assembly, air gap separation, or a reduced pressure principle backflow prevention device shall be installed.
(C) Backflow prevention devices required by this Chapter shall be installed at the meter, at the property line of the premises when meters are not used, or at a location designated accessible for maintenance and testing, and furthermore, where no part of the device will be submerged.
(D) Any protective device required by this Chapter shall be a model approved by the City or applicable State, County and Federal authorities and agencies. These devices shall be furnished and installed by and at the expense of the customer under the supervision and approval of the City.
(E) Backflow prevention devices installed pursuant to this Chapter shall be inspected and tested annually, or more often if necessary, by a certified tester at the expense of the customer.
(F) Inspections, tests, repairs and replacement of defective devices shall be accomplished in accordance with and pursuant to this Chapter, the Idaho Code and any agency having jurisdiction, by a certified tester at the expense of the customer.
(G) No underground sprinkling device will be installed without adequate backflow prevention devices at the point from which the water for irrigation is taken from the City water supply.
(H) Failure of the customer to cooperate in the installation, maintenance, testing or inspection of backflow prevention devices required by this Chapter, Idaho Code, and all standards, rules and regulations of the State of Idaho, the Idaho Department of Health and Welfare, and any other Federal, State, County or City authority or agency thereof shall be grounds for the termination of water service to the premises, or, in the alternative, the installation of an air-gap separation at the customer's expense. (Ord. 173, 9-16-80)