The answer to 'average cost of water line replacement' is that the cost can vary significantly depending on several factors. Typically, the cost can range from a few hundred dollars for a simple repair to several thousand dollars for a full water line replacement.
The main factors that affect the cost include the length of the water line, the material of the existing pipes, the accessibility of the pipes, and the complexity of the project. Replacing a short, accessible water line made of plastic or copper will generally be less expensive than replacing a long, difficult-to-access line made of old galvanized steel. Additionally, the cost may be higher if the water line is located under a driveway or landscaping that needs to be excavated and restored.