The answer to 'how much to fix backflow preventer in Illinois' is that the cost can vary significantly depending on several factors. Backflow preventer repair or replacement typically ranges from $150 to $500 or more, but the exact price will depend on the type of backflow preventer, the extent of the repair needed, and your location within Illinois.
Factors that influence the cost include the backflow preventer model, the complexity of the repair, whether parts need to be replaced, and the labor rates in your local area. Backflow preventers come in different styles, such as reduced pressure zone (RPZ) or double check valve, each with their own repair considerations. Additionally, the accessibility of the backflow preventer and any necessary permits or inspections can also affect the total cost.