FEMA NRI v1.20Released December 2025Methodology

South Carolina Disaster Risk

Natural disaster risk data for all 46 counties.

FEMA release

December 2025

Mean county NRI score

70.7

Counties with Data

of 46 total

County risk atlas

South Carolina 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

46/46

Mean county NRI score

70.7

Risk layers

Highest Risk Counties

Charleston County

Relatively High

NRI score 98.6

Horry County

Relatively High

NRI score 98.2

Beaufort County

Relatively High

NRI score 97.1

Berkeley County

Relatively High

NRI score 94.8

Greenville County

Relatively Moderate

NRI score 94.0

Lowest Risk Counties

McCormick County

Very Low

NRI score 9.5

Edgefield County

Very Low

NRI score 22.0

Calhoun County

Very Low

NRI score 22.6

Allendale County

Very Low

NRI score 35.5

Lee County

Very Low

NRI score 36.0

All South Carolina Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Charleston County	98.6	Relatively High	99.8	93.9	71.0	98.8
Horry County	98.2	Relatively High	92.0	89.9	96.7	95.9
Beaufort County	97.1	Relatively High	94.2	90.3	82.0	93.6
Berkeley County	94.8	Relatively High	80.7	89.8	78.1	97.7
Greenville County	94.0	Relatively Moderate	96.0	55.1	96.6	92.8
Dorchester County	93.7	Relatively Moderate	78.7	79.0	74.8	97.9
Richland County	93.1	Relatively Moderate	94.6	69.7	95.0	93.8
Georgetown County	92.5	Relatively Moderate	86.4	91.3	54.8	91.4
Lexington County	90.9	Relatively Moderate	90.6	75.3	97.6	91.4
Spartanburg County	90.6	Relatively Moderate	92.7	59.4	88.1	91.6
Florence County	89.6	Relatively Moderate	82.6	86.5	94.6	92.8
York County	88.7	Relatively Moderate	90.2	63.7	96.9	85.2
Orangeburg County	87.7	Relatively Moderate	75.8	79.9	66.3	95.6
Anderson County	87.2	Relatively Moderate	88.1	47.4	90.8	87.4
Oconee County	85.6	Relatively Moderate	81.1	63.4	81.0	80.2
Colleton County	85.5	Relatively Moderate	78.2	82.8	60.6	93.7
Dillon County	84.3	Relatively Moderate	61.5	81.3	80.2	85.4
Aiken County	84.2	Relatively Moderate	84.4	82.2	87.4	88.9
Williamsburg County	82.1	Relatively Moderate	59.8	87.2	44.5	91.8
Sumter County	81.7	Relatively Moderate	76.3	79.0	74.9	91.1
Marion County	80.7	Relatively Low	55.5	68.5	75.0	80.0
Lancaster County	79.4	Relatively Low	81.3	45.1	88.5	82.0
Jasper County	78.6	Relatively Low	59.0	76.7	35.8	82.7
Pickens County	77.6	Relatively Low	84.0	50.9	55.4	83.1
Clarendon County	76.5	Relatively Low	50.2	81.2	60.3	88.4
Laurens County	76.2	Relatively Low	71.9	49.1	65.2	81.9
Chesterfield County	74.0	Relatively Low	65.8	76.7	84.7	78.1
Greenwood County	72.7	Relatively Low	66.2	54.4	85.6	84.0
Darlington County	72.3	Relatively Low	64.2	74.0	84.4	86.1
Cherokee County	69.7	Relatively Low	72.5	37.5	82.6	74.2
Kershaw County	66.7	Relatively Low	64.4	69.7	72.9	82.3
Hampton County	64.8	Relatively Low	34.7	71.4	42.9	82.9
Newberry County	62.0	Relatively Low	62.9	53.9	80.9	82.3
Union County	58.2	Relatively Low	53.4	53.5	79.1	74.1
Marlboro County	57.5	Relatively Low	41.0	73.7	73.7	72.7
Bamberg County	46.5	Relatively Low	20.6	55.9	35.5	79.3
Barnwell County	45.8	Relatively Low	35.0	59.9	66.1	80.6
Abbeville County	45.4	Relatively Low	37.6	39.8	66.3	74.4
Chester County	43.2	Relatively Low	41.7	45.5	74.5	71.3
Fairfield County	40.8	Very Low	42.6	45.9	70.5	69.5
Saluda County	40.1	Very Low	46.6	52.3	64.0	66.8
Lee County	36.0	Very Low	19.4	57.4	60.1	72.2
Allendale County	35.5	Very Low	14.5	50.3	42.0	76.9
Calhoun County	22.6	Very Low	19.4	51.8	37.9	72.5
Edgefield County	22.0	Very Low	31.3	57.9	34.2	68.1
McCormick County	9.5	Very Low	16.8	34.8	40.1	51.3

Frequently Asked Questions

How many South Carolina county records are included?

RiskByCounty includes 46 South Carolina county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in South Carolina?

FEMA NRI v1.20 (December 2025) county rating counts for South Carolina: Very Low: 7; Relatively Low: 19; Relatively Moderate: 16; Relatively High: 4; Very High: 0; Not available: 0.

How complete are the five selected hazard fields for South Carolina?

FEMA NRI v1.20 (December 2025) availability among 46 county records: Flood: 46 of 46; Wildfire: 46 of 46; Tornado: 46 of 46; Earthquake: 46 of 46; Hurricane: 46 of 46. 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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