Keeping your water supply safe from contamination is essential. Mr Backflow provides professional ASSE backflow testing in Ann Arbor and Romulus, making sure your system is functioning properly. As a licensed and certified ASSE backflow tester, we specialize in backflow device installation and testing to prevent harmful pollutants from entering your home's water system. Our master plumber installs, replaces, and tests backflow prevention devices to keep your water safe and clean.