The answer to the cost of backflow preventer repair locally is that it can vary significantly depending on several factors. Backflow preventer repair costs are typically in the range of $150 to $500, but the final price will depend on the type of backflow preventer, the complexity of the repair, and your location.
Some key factors that influence the cost include the age and condition of the backflow preventer, the accessibility of the unit, whether any parts need to be replaced, and the labor rates in your local area. Repairs on older or more complex backflow preventers will generally be more expensive than simpler fixes. It's important to get quotes from multiple local plumbers to compare prices and find the best value for your needs.