Walked building and could not locate a testable backflow preventer. Found 9 non testable units installed. Building does not have a testable backflow device. Floor drains below soda machine needs to be jetted to prevent backups. Found water or condensation dripping from left cabinet underneath. This is possibly from condensation from the drain line. Noticed growths on drywall and green discoloration. Recommend calling the soda appliance company to see if a resolution can be made.