Storms, floods and disasters in Sempronius
Sempronius isn’t graded for hazard risk: Sempronius has 789 residents; we grade towns of 1,000 or more. Flood insurance has paid 5 claims here since 1979.
What Sempronius 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
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 Sempronius flood? Rarely: 5 flood claims since 1979
Every paid claim on a federal flood insurance policy in Sempronius, from FEMA’s records.
- Tropical Storm Henri1 claim · $26K
Sempronius isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Cayuga County.2 federal disasters brought FEMA money to Sempronius
Disasters that paid out in Sempronius itself (aid to households or repair grants to the Town of Sempronius), newest first, with that year’s flood claims.
- 2005Severe Storms and Flooding$104K to the Town of Sempronius for repairs
- 2004Snow$8K to the Town of Sempronius for repairs
Cayuga County has had 13 natural disasters declared by the President since 1953, most often floods, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees; the 2001 World Trade Center declarations.
Old photos of Sempronius after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Sempronius archive →Sempronius and its neighbors
How expected damage per building compares across the town line. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Spafford | Aless damage than 95% | river and rain flooding | 2 |
| Scott | Bless damage than 55% | river and rain flooding | 4 |
| Niles | C−more damage than 81% | river and rain flooding | 2 |
| Moravia | C−more damage than 81% | river and rain flooding | 2 |
| Summerhill | C−more damage than 84% | river and rain flooding | 12 |
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 Sempronius 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.
- 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 Sempronius
Does Sempronius flood?
Flood insurance has paid 5 claims in Sempronius since 1979, $59K in all. 2 properties have flooded more than once. The most claims came from Tropical Storm Henri (1).
Is Sempronius 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 Cayuga County, 17% of homes in mapped flood zones carry federal flood insurance, and 0.9% of all homes do.
How much is flood insurance in Sempronius?
FEMA’s Community Rating System list shows no discount for Sempronius’ 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 Sempronius?
By FEMA money that reached Sempronius, Severe Storms and Flooding (2005): $104K to the Town of Sempronius for repairs. By flood claims, Tropical Storm Henri: 1 paid, $26K.
Storm stories
Memories, warnings and help from neighbors in Sempronius.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Sempronius’ 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.