Method
The index covers every US city with at least 50,000 residents in the Census Bureau's Vintage 2025 population estimates, plus the three largest cities in states that have fewer, for 839 cities in total. Each city gets a percentile rank on four measures, which are weighted and added to give a score from 0 to 100:
- Housing age (30%): share of housing units built before 1980, from the American Community Survey 5-year estimates 2020-2024 (table B25034). Older plumbing fails more often.
- Freezing nights (25%): average number of nights a year below 32°F at the nearest NOAA station with 1991-2020 climate normals. Frozen pipes are one of the most expensive causes of water damage.
- Precipitation (20%): annual normal precipitation at the same station.
- Disaster history (25%): number of FEMA disaster declarations since January 2000 for severe storms, floods, hurricanes, tropical storms, coastal storms, winter storms, ice storms and freezing that included the city's main county (OpenFEMA).
Limits: the index measures exposure, not individual homes. It does not use insurance claims data, which is not public at city level, and county-level FEMA counts are shared by every city in the county. Connecticut declarations are matched across the 2022 switch from counties to planning regions.
Download the full dataset (CSV). You are welcome to use it with a link to this page.
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About the index
Which US city has the highest water damage risk?
Lowell, Massachusetts tops the 2026 index with a score of 86 out of 100, followed by Bristol, CT and Brockton, MA. Older housing, many freezing nights and repeated storm declarations push northeastern cities up the list.
Which city has the lowest water damage risk?
Lake Havasu City, Arizona scores lowest at 7. Low scores belong to newer, dry, warm cities, but a low score does not mean no risk: supply lines, water heaters and appliances fail everywhere.
Can I use this data?
Yes. Download the CSV and cite "Water Damage Crews, 2026 Water Damage Risk Index" with a link to this page. The underlying data is public: Census Bureau, NOAA and FEMA.