City averages in Angi's water damage guide run from $2,732 in Denver to $10,387 in Boise; the national average is $3,868 and the median of the city averages $4,580.
Boise's figures stand apart: its low end of $7,775 is above the national average. Most cities sit within a few thousand dollars of each other, and the spread inside each city (low to high) is wider than the gaps between cities, so the size of the job and the water type matter more than the city. The area table shows which parts of a home drive that spread, and 3 cities in the table (New York City, Dallas, Miami) are in states that license mold work; see mold licensing by state.