Photo: Excel23 · CC BY-SA 4.0FEMA expects about as much hazard damage per building in Williamston as in the typical U.S. town, mostly from river and rain flooding
On FEMA’s National Risk Index, Williamston gets a B− for hazard risk: higher expected damage per building than 52% of U.S. towns, #98 of 169 in South Carolina. Most of that expected damage is river and rain flooding (74%). FEMA’s files show no paid flood insurance claims here.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What Williamston faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Earthquakes
Tornadoes
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Williamston’s grade
River and rain flooding is 74% of the building damage FEMA expects in Williamston, and Williamston’s rate of river and rain flooding damage is higher than 63% of U.S. census tracts. Ice storms add 4%, at a rate in the top 6% of U.S. census tracts.
B− #98 of 169 in South Carolina; higher expected damage per building than 52% of U.S. towns (21,298).
Williamston’s residents live in 3 census tracts; FEMA’s figures are combined by where they live.
The typical South Carolina town has lower expected damage than 55% of U.S. towns; within the state, Williamston has more expected damage per building than 58% of South Carolina towns.
In dollars, FEMA expects about $1.4M a year in losses across Williamston: $954K to buildings, the rest to people and crops.
Does Williamston flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Williamston. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Williamston isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Anderson County.4 federal disasters brought FEMA money to Williamston
Disasters that paid out in Williamston itself (aid to households or repair grants to the Town of Williamston), newest first, with that year’s flood claims.
- 2024Hurricane Helene2,476 households applied for aid$1.6M aid approved$186K to the Town of Williamston for repairs
- 2017Hurricane Irma$28K to the Town of Williamston for repairs
- 2015Severe Storms and Flooding$56K to the Town of Williamston for repairs
- 2005Severe Ice Storm$50K to the Town of Williamston for repairs
Anderson County has had 14 natural disasters declared by the President since 1953, most often hurricanes and tropical storms, then winter storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Williamston after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Williamston archive →Get ready for what Williamston faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- Pick your spot now: the lowest floor, an inside room, no windows.
- A watch means be ready; a warning means take cover now.
- Keep shoes and a flashlight by the bed.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Williamston
Is Williamston at risk for natural disasters?
On FEMA’s National Risk Index, Williamston has higher expected damage per building than 52% of U.S. towns: B− for hazard risk, #98 of 169 in South Carolina. Most of the expected damage is river and rain flooding (74%) and earthquakes (8%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Williamston in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Anderson County, 21% of homes in mapped flood zones carry federal flood insurance, and 0.2% of all homes do.
How much is flood insurance in Williamston?
FEMA’s Community Rating System list shows no discount for Williamston’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Williamston?
By FEMA money that reached Williamston, Hurricane Helene (2024): 2,476 households applied for aid, $1.6M approved, and $186K to the Town of Williamston for repairs.
Is Williamston at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (74%), and Williamston’s rate for it is higher than 63% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Williamston.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Williamston’s residents lived in the 2020 census; OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.