Quite simply, “backflow” is the reversal of water flow from your on-property water system back into the municipal drinking water system – or even into the drinking water of buildings on your property. There are a couple of reasons this might happen. Imagine there’s a sudden drop in water pressure flowing into your facility, perhaps from a broken water main or from a nearby fire hydrant being used. The water from your property then gets pulled back into the drinking water system. This can also result if you have elevated water-storage tanks, creating higher pressure than the in-flow from the municipal system. The major concern is contamination. Untreated water flowing from your property into your community’s – or your facility’s - drinking water raises a host of potential health concerns.