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A main drain test must be conducted on every sprinkler system at least yearly However, if there is a backflow preventer and/or a pressure reducing valve on the incoming piping for a single water supply system supplying sprinkler systems, then a drain test must be conducted quarterly on at least one of the systems on the property, beyond the preventer or pressure reducer.. In addition to the main drain test, other tests are required depending on the type of sprinkler system.
© Hughes Associates,Inc. 2012