Backflow is the undesirable reversal of non-potable (untreated) water (or other substances) through an unprotected cross connection and into the piping of a public water system or a citizen’s drinking water system. Cross connection control devices have internal seals, springs, and moving parts that are subject to fatigue and wear. The City of Calgary requires these devices be tested to ensure they are functioning correctly. You can read more on the City of Calgary website. Schedule your service call today.