The cost to repair or replace water and sewer lines varies depending on the extent of the damage, location, and complexity of the job. For water line repairs, costs typically range from $300 to $1,500, while sewer line repairs can range from $1,000 to $4,000. Full replacements are more expensive, with water line replacements costing between $1,500 and $5,000, and sewer line replacements can range from $3,000 to $10,000 or more, depending on the depth, length, and method of repair.