Why must backflow preventers be tested at least once annually?

Backflow preventers must be tested annually since they have internal seals, springs, and moving parts that are subject to fouling, wear, or fatigue. The annual test is also a measure to make sure that proper backflow protection is being utilized. Hallsdale-Powell Utility District (PGUD) will have a contractor test each backflow according to the state guidelines. If the backflow preventor fails the annual test the customer will be repsonsible for having the proper repairs made. PGUD can provide an approved list of backflow testing companies, after a formal request by the customer, to conduct a re-test once the repairs are complete.