FEMA NRI v1.20Released December 2025Methodology

Massachusetts Disaster Risk

Natural disaster risk data for all 14 counties.

FEMA release

December 2025

Mean county NRI score

78.8

Counties with Data

of 14 total

County risk atlas

Massachusetts hazard exposure by county

FEMA NRI v1.20 scores on a 0–100 relative scale. Toggle the composite and five selected hazard categories out of FEMA's 18. Flood is the higher of Coastal Flooding and Inland Flooding NRI scores.

Counties

14/14

Mean county NRI score

78.8

Risk layers

Highest Risk Counties

Middlesex County

Relatively High

NRI score 96.9

Essex County

Relatively High

NRI score 95.6

Worcester County

Relatively Moderate

NRI score 93.5

Suffolk County

Relatively Moderate

NRI score 93.5

Hampden County

Relatively Moderate

NRI score 92.8

Lowest Risk Counties

Dukes County

Very Low

NRI score 16.8

Nantucket County

Very Low

NRI score 38.7

Franklin County

Relatively Low

NRI score 60.7

Hampshire County

Relatively Low

NRI score 69.9

Berkshire County

Relatively Moderate

NRI score 84.0

All Massachusetts Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Middlesex County	96.9	Relatively High	98.5	72.8	90.1	96.1
Essex County	95.6	Relatively High	97.8	59.2	92.4	94.9
Worcester County	93.5	Relatively Moderate	95.3	62.6	82.2	89.3
Suffolk County	93.5	Relatively Moderate	94.7	9.0	75.3	95.0
Hampden County	92.8	Relatively Moderate	95.9	39.3	82.7	90.6
Norfolk County	92.0	Relatively Moderate	95.5	49.8	69.0	91.5
Plymouth County	90.4	Relatively Moderate	94.4	53.8	48.2	87.7
Bristol County	89.9	Relatively Moderate	93.6	38.2	52.1	88.6
Barnstable County	89.1	Relatively Moderate	94.6	53.2	45.5	78.1
Berkshire County	84.0	Relatively Moderate	90.6	25.2	48.8	72.1
Hampshire County	69.9	Relatively Low	79.4	35.8	46.9	70.1
Franklin County	60.7	Relatively Low	73.5	37.0	31.6	58.7
Nantucket County	38.7	Very Low	70.0	13.0	4.1	22.4
Dukes County	16.8	Very Low	55.4	27.9	10.7	33.5

Frequently Asked Questions

How many Massachusetts county records are included?

RiskByCounty includes 14 Massachusetts county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in Massachusetts?

FEMA NRI v1.20 (December 2025) county rating counts for Massachusetts: Very Low: 2; Relatively Low: 2; Relatively Moderate: 8; Relatively High: 2; Very High: 0; Not available: 0.

How complete are the five selected hazard fields for Massachusetts?

FEMA NRI v1.20 (December 2025) availability among 14 county records: Flood: 14 of 14; Wildfire: 14 of 14; Tornado: 14 of 14; Earthquake: 14 of 14; Hurricane: 14 of 14. RiskByCounty displays five selected hazard categories out of FEMA's 18.

Official Ready.gov resource

Continue to Ready.gov for federal emergency-planning information maintained outside RiskByCounty.

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Data Source

County data sourced from FEMA National Risk Index v1.20, released December 2025. Values are labeled NRI score (0–100 relative scale). RiskByCounty displays five selected hazard categories out of FEMA's 18; flood is the higher of the Coastal Flooding and Inland Flooding source scores.

RiskByCounty presents county-level source fields and deterministic arithmetic summaries.

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