Backflow testing is a process that is used to test your plumbing system to make sure that drinking water is not being contaminated by dirty water infiltrating the water supply. Backflow prevention devices are a big help, but they can fail. This is why it is important to have your backflow tested yearly. Backflow testing is an important part of your home’s maintenance routine, because it makes sure that the water that you and your family are drinking is safe and clean.