Maine coastal flooding risk
York County has the highest coastal flooding risk in Maine, scoring 86.6 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | York County | 86.6 | Relatively High |
| 2 | Cumberland County | 78.4 | Relatively Moderate |
| 3 | Hancock County | 77 | Relatively Moderate |
| 4 | Sagadahoc County | 74.8 | Relatively Moderate |
| 5 | Washington County | 74.6 | Relatively Moderate |
| 6 | Lincoln County | 69.8 | Relatively Moderate |
| 7 | Knox County | 69.2 | Relatively Moderate |
| 8 | Waldo County | 58.8 | Relatively Low |
| 9 | Kennebec County | 54.8 | Relatively Low |
| 10 | Penobscot County | 41 | Very Low |
| 11 | Androscoggin County | 0 | No Rating |
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.
Coastal Flooding risk nationally:
Other hazard risks in Maine:
Frequently asked questions
What is the highest coastal flooding risk county in Maine?
York County, ME has the highest coastal flooding risk in Maine, with a FEMA National Risk Index score of 86.6 out of 100 (rated "Relatively High").
What causes coastal flooding risk in Maine?
Coastal flooding scores cover storm surge, wave action, and tidal flooding along the Gulf, Atlantic, and Pacific coasts, and Great Lakes shoreline. Inland flooding is scored separately. Counties with "Not Applicable" ratings have no significant coastal exposure. Coastal flood events are reported at zone level in NOAA Storm Events and are not included in county-level counts.