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Only ASSE-Licensed testers are authorized to test backflow prevention assemblies.  

No, the new plumbing Code requires testing of any backflow prevention device in order to prevent negative consequences of backflow.  Older devices could cause local, or even neighborhood-wide health impacts if they do not function appropriately.  Therefore, ALL devices are in-scope for testing.

No, the installation, repair, replacement and/or testing of in-scope testable backflow assemblies must be performed by an ASSE licensed contractor.  Other un-related plumbing tasks can be performed by a homeowner, but not activities relating to backflow prevention devices.

Review the 2015 Minnesota Plumbing Code Fact Sheet HERE!