Plumber Red Seal · Question
During a routine commercial building inspection, a plumber discovers a garden hose permanently connected to a potable water supply line for filling a decorative pond. The hose is submerged in the pond water. Which backflow prevention device is the MINIMUM acceptable protective measure required by code in this situation?
A garden hose submerged in a pond represents a severe hazard due to the potential for highly contaminated water to enter the potable supply. According to CSA B6
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Question: During a routine commercial building inspection, a plumber discovers a garden hose permanently connected to a potable water supply line for filling a decorative pond. The hose is submerged in the pond water. Which backflow prevention device is the MINIMUM acceptable protective measure required by code in this situation?
Answer options:
- Atmospheric Vacuum Breaker (AVB)
- Pressure Vacuum Breaker (PVB)
- Double Check Valve Assembly (DCVA) ✅ Reduced Pressure Principle Backflow Preventer (RP)
Correct answer: Reduced Pressure Principle Backflow Preventer (RP)
Explanation: A garden hose submerged in a pond represents a severe hazard due to the potential for highly contaminated water to enter the potable supply. According to CSA B64.10 and provincial codes, a Reduced Pressure Principle Backflow Preventer (RP) is required for severe hazard cross-connections, as it provides the highest level of protection against both backsiphonage and backpressure.
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