Storms, floods and disasters in Granville
Granville isn’t graded for hazard risk: Granville has 265 residents; we grade towns of 1,000 or more.
What Granville 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
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.
Does Granville flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Granville. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Granville isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Sioux County.2 federal disasters brought FEMA money to Granville
Disasters that paid out in Granville itself (aid to households or repair grants to the City of Granville), newest first, with that year’s flood claims.
- 2024Severe Storms, Flooding, Straight-line Winds, and Tornadoes6 households applied for aid$9K aid approved
- 2010Severe Storms, Flooding, and Tornadoes1 households applied for aid$194 aid approved
Sioux County has had 12 natural disasters declared by the President since 1953, most often severe storms, then floods. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Granville after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Granville archive →Get ready for what Granville 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.
- 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 Granville
Is Granville 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 Sioux County, 1.2% of all homes carry federal flood insurance.
How much is flood insurance in Granville?
FEMA’s Community Rating System list shows no discount for Granville’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 Granville?
By FEMA money that reached Granville, Severe Storms, Flooding, Straight-line Winds, and Tornadoes (2024): 6 households applied for aid, $9K approved.
Storm stories
Memories, warnings and help from neighbors in Granville.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Granville’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.