Maine landslide risk
Knox County has the highest landslide risk in Maine, scoring 85.7 out of 100 — rated "Relatively Low" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Knox County | 85.7 | Relatively Low | 0 |
| 2 | Oxford County | 83.2 | Relatively Low | 1 |
| 3 | Aroostook County | 80.4 | Relatively Low | 0 |
| 4 | Franklin County | 76.4 | Relatively Low | 0 |
| 5 | Somerset County | 76.2 | Relatively Low | 0 |
| 6 | Kennebec County | 72 | Relatively Low | 0 |
| 7 | Penobscot County | 69.4 | Relatively Low | 0 |
| 8 | York County | 66.3 | Relatively Low | 0 |
| 9 | Hancock County | 66.1 | Relatively Low | 0 |
| 10 | Piscataquis County | 63.4 | Relatively Low | 0 |
| 11 | Cumberland County | 63.2 | Relatively Low | 0 |
| 12 | Washington County | 62 | Very Low | 0 |
| 13 | Androscoggin County | 60.7 | Very Low | 0 |
| 14 | Waldo County | 60.4 | Very Low | 0 |
| 15 | Lincoln County | 57 | Very Low | 0 |
| 16 | Sagadahoc County | 45 | 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.
Landslide risk nationally:
Other hazard risks in Maine:
Frequently asked questions
What is the highest landslide risk county in Maine?
Knox County, ME has the highest landslide risk in Maine, with a FEMA National Risk Index score of 85.7 out of 100 (rated "Relatively Low").
What causes landslide risk in Maine?
Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.