(a) Whenever the following items exist or activities are conducted on premises served by the public water systems, a potential hazard to the public water supplies shall be presumed, and a backflow prevention method of the type specified herein for that item or activity must be utilized or installed at each service connection for that premises. If an activity or item is not on the following list, it shall be evaluated by Tucson Water and a method of backflow prevention will be determined.
(1) Cooling tower, boiler, condenser, chiller, and other cooling systems: RPA.
(2) Tank, vessel, receptacle, and all other water connections, including mobile units, except emergency vehicles and private swimming pools: RPA.
(3) Icemaker (other than a residential service): RPA.
(4) Water-cooled equipment, boosters, pumps or autoclaves: RPA.
(5) Water treatment facilities and all water processing equipment (other than residential water softeners): RPA.
(6) Bottle washer, bedpan washer, garbage can washer: RPA.
(7) Pesticide, herbicide, fertilizer, and chemical applicators (other than typical in- home use): RPA.
(8) Aspirator: RPA.
(9) Commercial dishwashers, food processing and/or preparation equipment, carbonation equipment, or other food service processes: RPA.
(10) Decorative fountain, baptismal, or any location water is exposed to atmosphere: RPA.
(11) X-ray equipment, plating equipment, or any other photographic processing equipment: RPA.
(12) Auxiliary water supply and/or connections to unapproved water supply systems: RPA.
(13) Reclaimed water sites with potable water connection: RPA.
(14) Recreational vehicle dump stations (sewer), or any other location where water may be exposed to bacteria, virus or gas: RPA.
(15) Any premises on which chemicals, oils, solvents, pesticides, disinfectants, cleaning agents, acids or other pollutants and/or contaminants are handled in a manner by which they may come in direct contact with water, or there is evidence of the potential to contact water: RPA.
(16) Materials and piping systems unapproved by the City Plumbing Code or Environmental Protection Agency for potable water usage: RPA.
(17) Separately metered or unprotected irrigation systems, and construction water services: RPA or PVB/SVB as allowed.
(18) Any premises where a cross-connection is maintained or where internal backflow protection is required pursuant to the City Plumbing Code: RPA.
(19) Multimetered properties with more than one (1) meter connected: RPA.
(20) Fire systems--AWWA Classes 1 and 2 and all systems constructed of a piping material not approved for potable water pursuant to the City Plumbing Code: DCVA or Double Detector CVA. Furthermore, fire systems, Classes 1 and 2, that are under the jurisdiction of the fire department or a fire district that requires periodic sprinkler system testing similar to the city's are exempt from this article: DCVA.
(21) Fire systems--AWWA Class 3, 4, 5, 6: RPA or RPA with detector.
(22) Fire systems which require backflow protection and where backflow protection is required on the industrial/domestic service connection that is located on the same premises, both service connections will have adequate backflow protection for the highest degree of hazard affecting either system: RPA (Requirement may be waived by Tucson Water).
(23) Any premises which has a source of water supply that is not accepted by the public water system and or not approved by the Arizona Department of Environmental Quality: As determined by Tucson Water.
(24) Any premises where an unprotected cross-connection exists or where there has previously occurred a cross connection problem within the premises: As determined by Tucson Water.
(25) Any premises where there is a significant possibility that a cross-connection problem will occur and entry onto the premises is restricted to the extent that cross-connection inspections can not be made with sufficient frequency or on sufficiently short notice to assure that unprotected cross-connections do not exist: As determined by Tucson Water.
(26) Multi-use commercial property: RPA.
(27) Properties with active private wells: RPA.
(28) Consecutive systems, when required by Tucson Water: RPA.
(29) Fire hydrant/construction water: RPA.
(30) Jumper connection to new water mains: RPA.
(31) Any building three (3) stories or greater than thirty-four (34) feet in height as measured from the service level: RPA.
(32) Any premise on which there is a pressurized gray water system: RPA.
(33) Any premise on which there is pressurized rain water harvesting system: RPA.
(b) When two (2) or more of the activities listed above are conducted on the same premises and served by the same service connection or multiple service connections, the most restrictive backflow prevention method required for any of the activities conducted on the premises shall be required to be installed at each service connection. The order of most restrictive to least restrictive backflow prevention methods shall be as follows:
(1) Air gap (AG).
(2) Reduced pressure principle assembly (RPA).
(3) Reduced pressure principal detector assembly (RPDA).
(4) Double check valve assembly (DCVA).
(5) Double check detector assembly (DCDA).
(6) Pressure vacuum breaker assembly (PVB).
(7) Spill resistant pressure vacuum breaker (SVB).
(Ord. No. 9976, § 2, 5-24-04; Ord. No. 10867, § 1, 12-21-10)