A backflow preventer is a plumbing system that prevents graywater and blackwater from backing up into your main water supply. If you have a preventer, you should schedule annual or biannual backflow testing in Clarksburg, WV. Even if it’s not legally required, Midstate Plumbing & Air recommends it as a good maintenance habit. Backflow prevention systems can experience great wear and tear through normal operation. They need regular upkeep and calibration and will eventually require replacement.