Question 1

Which county in New Hampshire has the highest natural disaster risk?

Accepted Answer

Hillsborough County has the highest natural disaster risk score in New Hampshire at 89.8 (Relatively Moderate), based on FEMA National Risk Index data.

Question 2

Which county in New Hampshire is the safest from natural disasters?

Accepted Answer

Sullivan County has the lowest natural disaster risk score in New Hampshire at 37.6 (Very Low), based on FEMA NRI data.

Question 3

What natural disasters are most common in New Hampshire?

Accepted Answer

New Hampshire counties face varying levels of risk from floods, wildfires, tornadoes, earthquakes, and hurricanes. The FEMA National Risk Index scores each county across 18 hazard types. See individual county pages for detailed hazard breakdowns.

Question 4

How is natural disaster risk measured by county?

Accepted Answer

The FEMA National Risk Index (NRI) measures natural disaster risk using expected annual loss, social vulnerability, and community resilience. Scores are normalized nationally, with ratings from Very Low to Very High across 18 natural hazard types.

County	Risk Score	Rating	Flood	Wildfire	Tornado	Earthquake
Hillsborough County	89.8	Relatively Moderate	92.6	67.0	82.6	88.2
Rockingham County	85.8	Relatively Moderate	92.8	47.8	73.5	87.5
Grafton County	81.8	Relatively Moderate	90.1	30.9	24.4	69.6
Merrimack County	78.2	Relatively Low	85.8	35.2	56.2	76.1
Coos County	72.8	Relatively Low	77.6	16.4	10.6	49.0
Carroll County	71.0	Relatively Low	82.0	33.6	18.9	62.8
Strafford County	64.1	Relatively Low	76.0	34.5	42.2	77.4
Cheshire County	60.5	Relatively Low	74.8	24.5	43.6	58.0
Belknap County	57.4	Relatively Low	70.3	25.3	31.4	59.8
Sullivan County	37.6	Very Low	60.6	13.7	22.7	43.1

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