What Causes Backflow?
There are many reasons why backflow occurs. Municipal and private water systems are very dynamic and in a constant state of fluctuation. The most common situation happens when there is a water main break and the area of the service pipe must be isolated and repaired. When the valves around the repair site are closed, the flow of water is stopped to all the points of use, such as homes and businesses, and begins to flow backwards towards the repair. Therefore, any contaminating substances that are connected to the water system will begin to be siphoned back into the drinking water supply.
