A. An approved backflow device shall be installed on all connections to the public water supply as described in the plumbing code, 77 Illinois administrative code 890 and the agency's regulations 35 Illinois administrative code 680. In addition, an approved backflow prevention device shall be installed on each service line to a consumer's water system serving premises, where in the judgment of the superintendent of water, actual or potential hazards to the public water supply system exist.
B. An approved backflow prevention device shall be installed on each service line to a consumer's water system serving premises where the following conditions exist:
1. Premises having an auxiliary water supply, unless such auxiliary supply is accepted as an additional source by the environmental protection agency.
2. Premises on which any substance is handled which can create an actual or potential hazard to the public water supply system. This shall include premises having sources or systems containing process fluids or waters originating from the public water supply system which are no longer under the sanitary control of the superintendent of water.
3. Premises having internal cross connections that, in the judgment of the superintendent of water and/or the cross connection control device inspector, are not correctable or intricate plumbing arrangements which make it impractical to determine whether or not cross connections exist.
4. Premises where, because of security requirements or other prohibitions or restrictions, it is impossible or impractical to make a complete cross connection survey.
5. Premises having a repeated history of cross connections being established or reestablished.
C. An approved backflow device shall be installed on all connections to the public water supply as described in the plumbing code, 77 Illinois administrative code 890 and the agency's regulations 35 Illinois administrative code 653. In addition, an approved backflow prevention device shall be installed on each service line to a consumer's water system serving, but not necessarily limited to, the following types of facilities unless the superintendent of water determines that no actual or potential hazard to the public water supply system exists:
1. Hospitals, mortuaries, clinics, nursing homes.
2. Laboratories.
3. Piers, docks, waterfront facilities.
4. Sewage treatment plants, sewage pumping stations or stormwater pumping stations.
5. Food or beverage processing plants.
6. Chemical plants.
7. Metal plating industries.
8. Petroleum processing or storage plants.
9. Radioactive material processing plants or nuclear reactors.
10. Car washes.
11. Pesticide, or herbicide or extermination plants and trucks.
12. Farm service and fertilizer plants and trucks.
D. The type of protection required under this section shall depend on the degree of hazard which exists as follows:
1. An approved fixed proper air gap separation shall be installed where the public water supply system may be contaminated with substances that could cause a severe health hazard.
2. An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention assembly shall be installed where the public water supply system may be contaminated with a substance that could cause a system or health hazard.
3. An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention assembly or a double check valve assembly shall be installed where the public water supply system may be polluted with substances that could cause a pollution hazard not dangerous to health.
E. The type of protection required under subsections B4 and B5 of this section shall be an approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device.
F. Where a public water supply or an auxiliary water supply is used for a fire protection system, reduced pressure principle backflow preventers shall be installed on fire safety systems connected to the public water supply when:
1. The fire safety system contains antifreeze, fire retardant or other chemicals;
2. Water is pumped into the system from another source;
3. Water flows by gravity from a nonpotable source; or water can be pumped into the fire safety system from any other source; or
4. There is a connection whereby another source can be introduced into the fire safety system.
G. All other fire safety systems connected to the potable water supply shall be protected by a double check valve assembly on metered service lines and a double detector check valve assembly on unmetered service lines. (Ord. 91-52, 12-16-1991)