Drinking water flows from the source to your tap in pressurized water pipes. Normally it flows in one direction, though under certain circumstances it can flow in the opposite direction, or "backflow." When backflow occurs, water runs backwards through the water system and could contain something that might contaminate the drinking water supply. TVWD strives to maintain positive pressure in the system at all times, but events such as main breaks and fire fighting can contribute to backflow conditions.
