A. Circumstances Requiring Installation Of Device: Backflow prevention devices shall be installed at the ties on the premises or the materials used in connection with service connection or within any premises where, in the judgment of the city and/or health officer, the nature and extent of the activities, or 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 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.
2. Premises having internal cross connections that are not correctable, or intricate plumbing arrangements which make it impractical 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 assure that cross connections do not exist.
4. Premises having a repeated history of cross connections being established or reestablished.
5. Premises on which any substance is handled under pressure so as to permit entry into the public 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 public water supply. A backflow prevention device shall be installed at these facilities:
a. Hospitals, mortuaries, clinics.
b. 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. Radioactive material processing plants or nuclear reactors.
i. Others specified by the state of Idaho.
8. Other premises, as specified by the city, where backflow prevention devices are required to protect the public water supply.
B. Type Of Device: The type of protective device required shall depend on the degree of hazard which exists.
1. Health Or System Hazard: An air gap separation or reduced pressure principle backflow prevention device shall be installed where the public 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. Objectionable But Not Hazardous: 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. Location: Backflow prevention devices required by this section shall be installed at the meter, at the property line of the premises when meters are not used, or at a location designated by the purveyor. The device shall be located so as to be readily accessible for maintenance and testing, and furthermore, where no part of the device will be submerged.
D. Installation: Backflow prevention devices required by this section shall be installed under the supervision of and with approval of the city.
E. Model; Cost: Any protective device required by this section shall be a model approved by the Idaho department of environmental quality or the Central district health department. A double check valve assembly or a reduced pressure principle backflow prevention device will be approved if it has successfully passed performance tests of the state of Idaho or other testing laboratories satisfactory to the state of Idaho and the supervisor. These devices shall be furnished and installed by and at the expense of the customer.
F. Inspection; Testing; Maintenance: Backflow prevention devices installed pursuant to this section, except atmospheric vacuum breakers, shall be inspected and tested annually or more often if necessary. Inspections, tests and maintenance shall be at the customer's expense. Whenever the devices are found to be defective, they shall be repaired, overhauled or replaced at the customer's expense. Inspections, tests, repairs and records thereof shall be accomplished under the city's supervision by the certified testers, and copies of the test results shall be submitted to the city.
G. Underground Sprinkling Device: 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 public water supply.
H. Failure To Comply: Failure of the customer to cooperate in the installation, maintenance, testing or inspection of backflow prevention devices required by this section shall be grounds for terminating water service to the premises, or, in the alternative, the installation of an air gap separation at the customer's expense. (Ord. 12-550, 6-11-2013; amd. Ord. 16-561A, 11-8-2016)