The answer to 'cost of pressure regulator repair in Illinois' is that the cost can vary significantly depending on several factors. Generally, the cost to repair a pressure regulator can range from $150 to $500 or more, depending on the complexity of the repair and your location within Illinois.
Some key factors that influence the cost include the type of pressure regulator, the extent of the damage or issue, the labor rates in your local area, and whether any replacement parts are needed. It's important to get quotes from local plumbing professionals, as costs can vary quite a bit by region.