If you enforce NFPA 25 then you should be doing and or requiring the test as it is a NFPA 25 requirement. What I see being done is the backflow test required by the plumbing code and or health regulations. I do not see this test being enforced on a regular bases,not sure why.
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Easy. They now worry about rainwater collection and greywater systems because that's the latest, perceived hazard to potable water supplies. It's all about the latest trend in backflow preventer world.