The average water damage restoration job costs $3,868 in Angi's guide, typically $1,383 to $6,369, at $3 to $7.50 per square foot depending on how dirty the water is.
The guide prices clean water (Category 1) at $3.50 per square foot, gray water (Category 2) at $5.25 per square foot, black water (Category 3, includes sewage) at $7.50 per square foot. EPA's guidance is “It is important to dry water-damaged areas and items within 24-48 hours to prevent mold growth.” (U.S. EPA, A Brief Guide to Mold, Moisture and Your Home) The guide to when water damage becomes mold explains the timeline, and city averages show how the total varies across the 14 cities the guide lists.