Simeon and Jane Rucker Log House · Photo: Rheave · CC BY-SA 3.0On FEMA’s figures, Alpharetta faces less hazard damage per building than 86% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Alpharetta gets an A for hazard risk: lower expected damage per building than 86% of U.S. towns, #42 of 264 in Georgia. Most of that expected damage is river and rain flooding (82%). Flood insurance has paid 26 claims here since 2004.
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 stands out about Alpharetta’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Alpharetta 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
Tornadoes
Earthquakes
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 Alpharetta’s grade
River and rain flooding is 82% of the building damage FEMA expects in Alpharetta, and Alpharetta’s rate of river and rain flooding damage is lower than 64% of U.S. census tracts. Next is tornadoes at 8% (higher than 58% of U.S. census tracts).
A #42 of 264 in Georgia; lower expected damage per building than 86% of U.S. towns (21,298).
Alpharetta’s residents live in 26 census tracts; FEMA’s figures are combined by where they live.
The typical Georgia town has lower expected damage than 72% of U.S. towns; within the state, Alpharetta has less expected damage per building than 84% of Georgia towns.
In dollars, FEMA expects about $16.8M a year in losses across Alpharetta: $14.7M to buildings, the rest to people and crops.
Does Alpharetta flood? Sometimes: 26 flood claims since 2004
Every paid claim on a federal flood insurance policy in Alpharetta, from FEMA’s records: 1.0 per 1,000 homes, fewer than 78% of the 13,809 U.S. towns with a flood insurance record.
- The Late summer storms6 claims · $136K
- Tropical Storm Ivan3 claims · $80K
- Hurricane Dennis1 claim · $8K
Alpharetta isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Fulton County.5 federal disasters brought FEMA money to Alpharetta
Disasters that paid out in Alpharetta itself (aid to households or repair grants to the City of Alpharetta), newest first, with that year’s flood claims.
- 2024Hurricane Helene129 households applied for aid$49K aid approved
- 2017Hurricane Irma$25K to the City of Alpharetta for repairs
- 2009Severe Storms and Flooding266 households applied for aid$221K aid approved$19K to the City of Alpharetta for repairs6 flood claims paid that year
- 2004Hurricane Ivan53 households applied for aid$77K aid approved$71K to the City of Alpharetta for repairs3 flood claims paid for it, $80K
- 2000Severe Winter Storm$41K to the City of Alpharetta for repairs
Fulton County has had 15 natural disasters declared by the President since 1953, most often severe storms, then hurricanes and tropical storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Alpharetta after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Alpharetta archive →Alpharetta and its neighbors
Alpharetta has the lowest expected damage per building of the 4 graded towns here. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Alpharetta | Aless damage than 86% | river and rain flooding | 26 |
| Roswell | A−less damage than 76% | river and rain flooding | 61 |
| Johns Creek | B+less damage than 75% | river and rain flooding | 25 |
| Milton | Bless damage than 62% | river and rain flooding | — |
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Alpharetta 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.
- 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.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- 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 Alpharetta
Is Alpharetta at risk for natural disasters?
On FEMA’s National Risk Index, Alpharetta has lower expected damage per building than 86% of U.S. towns: A for hazard risk, #42 of 264 in Georgia. Most of the expected damage is river and rain flooding (82%) and tornadoes (8%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Alpharetta flood?
Flood insurance has paid 26 claims in Alpharetta since 2004, $481K in all, or 1.0 per 1,000 homes, fewer than 78% of U.S. towns with a flood insurance record. 4 properties have flooded more than once. The most claims came from Late summer storms (6).
Is Alpharetta 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 Fulton County, 40% of homes in mapped flood zones carry federal flood insurance, and 0.8% of all homes do.
How much is flood insurance in Alpharetta?
FEMA’s Community Rating System list shows no discount for Alpharetta’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 Alpharetta?
By FEMA money that reached Alpharetta, Severe Storms and Flooding (2009): 266 households applied for aid, $221K approved, and $19K to the City of Alpharetta for repairs. By flood claims, Late summer storms: 6 paid, $136K.
Is Alpharetta at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (82%), and Alpharetta’s rate for it is lower than 64% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Alpharetta.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Alpharetta’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.