Under California regulations, when is a reduced pressure principle (RPP) backflow prevention assembly required for a residential water service connection?
Correct Answer
A) When the residence has an auxiliary water system or potential cross-connection hazard
California Plumbing Code Section 603.2 requires RPP assemblies when auxiliary water systems, used water sources, or other potential contamination hazards exist. This includes homes with wells, irrigation systems connected to potable water, or other cross-connection risks that could contaminate the public water supply.
Why This Is the Correct Answer
California Plumbing Code Section 603.2 mandates RPP assemblies for residential connections when auxiliary water systems or cross-connection hazards exist. This includes homes with wells, irrigation systems connected to potable water, fire sprinkler systems, or any secondary water source that could potentially contaminate the public water supply through backflow. The RPP assembly provides the highest level of protection against both backpressure and backsiphonage conditions.
Why the Other Options Are Wrong
Option B: Only for commercial properties
This is incorrect because RPP assemblies are required for both residential and commercial properties when cross-connection hazards exist. The California Plumbing Code does not exempt residential properties from backflow prevention requirements when auxiliary water systems or contamination risks are present.
Option C: Never required for residential applications
This is false because California regulations do require RPP assemblies for residential applications when specific conditions exist. The code specifically addresses residential cross-connection hazards and mandates appropriate backflow prevention measures to protect public water supplies from contamination.
Option D: When the residence has a swimming pool with an automatic fill valve
While swimming pools can create cross-connection hazards, this option is too narrow. RPP assemblies are required for various auxiliary water systems and cross-connection risks, not just pools with automatic fill valves. The requirement encompasses a broader range of potential contamination sources.
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