Hawaii tsunami risk
Honolulu County has the highest tsunami risk in Hawaii, scoring 92.3 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Honolulu County | 92.3 | Relatively High |
| 2 | Maui County | 90.8 | Relatively High |
| 3 | Hawaii County | 86.2 | Relatively Moderate |
| 4 | Kauai County | 75.4 | Relatively Moderate |
| 5 | Kalawao County | 10.8 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Tsunami risk nationally:
Other hazard risks in Hawaii:
Frequently asked questions
What is the highest tsunami risk county in Hawaii?
Honolulu County, HI has the highest tsunami risk in Hawaii, with a FEMA National Risk Index score of 92.3 out of 100 (rated "Relatively High").
What causes tsunami risk in Hawaii?
Tsunami risk covers expected losses from seismically generated ocean waves. Risk concentrates on the Pacific Coast — especially Oregon, Washington, and Alaska — where the Cascadia Subduction Zone and other fault systems can generate destructive local tsunamis with little warning. Atlantic and Gulf coasts carry lower but non-zero risk from distant earthquake sources.