WHAT IS BACKFLOW?
 
Backflow is where water flows through your plumbing supply in the wrong direction, that is, toward the main water supply.  This can potentially be hazardous to public health where water supplies are connected with pollutants or contaminants that, due to a backflow incident, can unintentionally enter the main drinking water supply....

1.      Lean how to turn your water supply off at the meter
 
This may seem obvious to some people, but for those who don’t know how it could potentially cost you thousands.  For instance, if a plastic hose running to your washing machine or dishwasher breaks and you don’t know how to turn off the water supply, your kitchen or laundry will flood causing thousands of dollars in damage.