1. An approved backflow prevention device shall be installed between the service connection and the point of potential backflow into a consumer’s water supply system when in the judgment of the Manager a health, plumbing, pollution or system hazard exists.
2. An approved backflow prevention device shall be installed when the following conditions are found by the Manager to exist:
a. Premises on which any substance is handled in such a fashion as to create an actual or potential hazard to a public water supply system. This shall include premises having sources or systems containing process fluids or waters originating from a public water supply system which are no longer under the sanitary control of the owner;
b. Premises having internal cross connections that, in the judgment of the Manager, are not correctable, or there exist intricate plumbing arrangements which made it impracticable to determine whether or not cross connections exist.
c. Premises where, because of security requirements or other prohibitions or restrictions, it is impossible or impractical to make a complete cross connection survey;
d. Premises having a repeated history of cross connections being established or re-established;
e. Premises having more than one customer service connection which could constitute a potential cross connection.
3. An approved backflow prevention device shall be installed on each service line to a customer’s water supply system serving the following types of facilities unless the Manager determines that no health, pollution, or system hazard to the public water supply system exists:
a. Hospitals, mortuaries, dental clinics, nursing and convalescent homes, medical buildings;
b. Testing laboratories, film laboratories, film development facilities;
c. Sewage treatment plants, sewage pumping stations, or storm water pumping stations;
d. Food or beverage processing plants;
e. Chemical plants;
f. Metal de-greasing, plating industries, machine tool plants, dye and metal processing or productions;
g. Chemical and petroleum processing or storage plants;
h. Car washes, automobile servicing facilities;
i. Lawn irrigation systems and swimming pools;
j. Laundries and dry cleaners;
k. Packing houses;
l. Power plants;
m. Premises having radioactive materials such as laboratories, industries, hospitals;
n. Rendering plants;
o. Premises having water recirculating system as used for boilers or cooling systems;
p. Veterinary establishments, kennels, feedyards, stables, rodeo grounds, stockyards, pet grooming, salons;
q. Beauty salons, barbershops, massage parlors, health clubs;
r. Fire suppressions systems;
s. Multi-storied buildings greater than three (3) stories in height;
t. Schools, universities, colleges;
u. Other commercial or industrial facilities which may constitute potential cross connection.