Hawaii inland flooding risk
Honolulu County has the highest inland flooding risk in Hawaii, scoring 99.3 out of 100 — rated "Very High" by FEMA's National Risk Index. NOAA has recorded 217 inland flooding events across Hawaii over the past decade.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Honolulu County | 99.3 | Very High | 68 |
| 2 | Hawaii County | 98.9 | Relatively High | 55 |
| 3 | Maui County | 93.7 | Relatively High | 59 |
| 4 | Kauai County | 90.6 | Relatively Moderate | 59 |
| 5 | Kalawao County | 0.7 | Very Low | 0 |
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.
Inland Flooding risk nationally:
Other hazard risks in Hawaii:
Frequently asked questions
What is the highest inland flooding risk county in Hawaii?
Honolulu County, HI has the highest inland flooding risk in Hawaii, with a FEMA National Risk Index score of 99.3 out of 100 (rated "Very High").
How many counties in Hawaii are rated Very High for inland flooding risk?
1 of 5 scored Hawaii counties are rated "Very High" for inland flooding risk by FEMA's National Risk Index.
What causes inland flooding risk in Hawaii?
Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.