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A potable water supply system shall be designed, installed and maintained in such a manner so as to prevent contamination from nonpotable liquids, solids or gases being introduced into the potable water supply through cross-connections or any other piping connections to the system. Backflow preventer applications shall conform to Table 18-29-608.1.
For a printer-friendly PDF version of Table 18-29-608.1, please click here.
Device | Degree of Hazard a | Application b | Applicable Standards |
Device | Degree of Hazard a | Application b | Applicable Standards |
Air gap c |
High or low hazard | Backsiphonage or backpressure | ASME A112.1.2 |
Antisiphon-type Water Closet Flush Tank Ball Cock | Low Hazard | Backsiphonage only | ASSE 1002 CSA CAN/CSA-B125 |
Reduced Pressure Principle Backflow Preventer | High or low hazard | Backpressure or backsiphonage Sizes 1/4" to 10" | ASSE 1013 AWWA C511 CSA CAN/CSA B64.4 |
Reduced Pressure Detector Assembly Backflow Preventer | High or low hazard | Backsiphonage or backpressure | ASSE 1047 |
Double Check Backflow Prevention Assembly | Low hazard | Backpressure or backsiphonage Sizes 3/8" to 16" | ASSE 1015 AWWA C510 |
Double Check Detector Backflow Preventer Assembly | Low hazard | Backpressure or backsiphonage (Fire sprinkler systems) Sizes 1 1/2" - 16" | ASSE 1048 |
Dual Check Valve-Type Backflow Preventer | Low hazard | Backpressure or backsiphonage Sizes 1/4" - 1" | ASSE 1024 |
Backflow Preventer with Intermediate Atmospheric Vents | Low hazard | Backpressure or backsiphonage Sizes 1/4" - 3/4" | ASSE 1012 CSA CAN/CSA-B64.3 |
Dual Check Valve-Type Backflow Preventer for Carbonated Beverage Dispensers/Post Mix Type | Low hazard | Backpressure or backsiphonage Sizes 1/4" - 3/8" | ASSE 1032 |
Pipe-Applied Atmospheric-Type Vacuum Breaker | High or low hazard | Backsiphonage only Sizes 1/4" - 4" | ASSE 1001 CSA CAN/CSA-B64.1.1 |
Pressure Vacuum Breaker Assembly | High or low hazard | Backsiphonage only Sizes 1/2" - 2" | ASSE 1020 |
Hose-connection Vacuum Breaker | High or low hazard | Backsiphonage Sizes 1/2", 3/4", 1" | ASSE 1011 CSA CAN/CSA-B64.2 |
Vacuum Breaker Wall Hydrants, Frost-Resistant, Automatic Draining Type | High or low hazard | Backsiphonage Sizes 3/4", 1" | ASSE 1019 CSA CAN/CSA-B64.2.2 |
Laboratory Faucet Backflow Preventer (Non-testable) | Low hazard | Backsiphonage | ASSE 1035 CSA B64.7 |
Hose Connection Backflow Preventer (Non-testable) | Low hazard | Low head backpressure, rated working pressure backpressure or backsiphonage Sizes 1/2" - 1" | ASSE 1052 |
Spill-proof vacuum breaker | High or low hazard | Backsiphonage only Sizes 1/4" - 2" | ASSE 1056 |
For SI: 1 inch = 25.4 mm
a Low Hazard - See Pollution (Section 202) and Department of Water Management requirements
High Hazard - See Contamination (Section 202) and Department of Water Management requirements
b See Backpressure (Section 202)
See Backpressure, Low Head (Section 202)
See Backsiphonage (Section 202)
c Break tank
d For systems using non-food grade chemical additives
(Amend Coun. J. 11-8-12, p. 38872, § 353)