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The Ontario Building Code | Back-Siphonage Preventers and Backflow Preventers

7.2.10.10. Back-Siphonage Preventers and backflow Preventers

(1) Except as provided in Sentence (2), back-siphonage preventersand backflow preventers shall be certified to,

(a) CSA B64.0, "Definitions, General Requirements and Test Methods for Vacuum Breakers and backflow Preventers",

(b) CSA B64.1.1, "Atmospheric Vacuum Breakers (AVB)",

(c) CSA B64.1.2, "pressure Vacuum Breakers (PVB)",

(d) CSA B64.1.3, "Spill-resistant pressure Vacuum Breakers (SRPVB)",

(e) CSA B64.1.4, "Vacuum Breaker, Air Space Type (ASVB)",

(f) CSA B64.2, "Hose Connection Vacuum Breakers (HCVB)",

(g) CSA B64.2.1, "Hose Connection Vacuum Breakers (HCVB) with Manual Draining Feature",

(h) CSA B64.2.1.1, "Hose Connection Dual Check Vacuum Breakers (HCDVB)",

(i) CSA B64.2.2, "Hose Connection Vacuum Breakers (HCVB) with Automatic Draining Feature",

(j) CSA B64.3, "Dual Check Valve backflow Preventers with Atmospheric Port (DCAP)",

(k) CSA B64.3.1, "Dual Check Valve backflow Preventers with Atmospheric Port for Carbonators (DCAPC)",

(l) CSA B64.4, "Reduced pressure Principle (RP) backflow Preventers",

(m) CSA B64.5, "Double Check Valve (DCVA) backflow Preventers",

(n) CSA B64.6, "Dual Check Valve (DuC) backflow Preventers",

(o) CSA B64.7, "Laboratory Faucet Vacuum Breakers (LFVB)",

(p) CSA B64.8, "Dual Check Valve backflow Preventers with Intermediate vent (DuCV)", or

(q) CSA B64.10, "Selection and installation of Backflow Preventers".

(2) Back-siphonage preventers (anti-siphon fill valves) for tank type water closets shall be certified to CSA B125.3, "Plumbing Fittings".

In Plain Language

Except in specific cases, back-siphonage preventers and backflow preventers must be installed to protect the potable water supply from contamination by non-potable water being drawn backward into the system.

This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.