Which backflow prevention device are you referring to? I believe that the only backflow preventer is on the incoming water supply line, and it is in the meter box on the county side of the meter. So, it doesn't belong to the homeowner. This is the case for most Villages houses.
Note that a backflow preventer on the sanitary sewer pipe is illegal by code if the house finished floor level is higher than the manhole cover in the street, which is the case for most Villages houses.
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