Photo: Jerrye & Roy Klotz, MD · CC BY-SA 3.0Storms, floods and disasters in Delaware
Delaware isn’t graded for hazard risk: Delaware has 101 residents; we grade towns of 1,000 or more.
What Delaware 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
Hurricanes
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 Delaware flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Delaware. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Delaware isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Warren County.The storms Delaware remembers
None of the 19 disasters declared for Warren County shows FEMA aid or repair money reaching Delaware itself in FEMA’s records, so these are its biggest flood-claim years.
Warren County has had 19 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; the 2001 World Trade Center declarations.
Delaware 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 |
|---|---|---|---|
| Upper Mount Bethel Township | B−less damage than 54% | river and rain flooding | 124 |
| Knowlton Township | B−less damage than 52% | river and rain flooding | 109 |
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 Delaware 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.
- The season runs June through November and peaks from mid-August to mid-October.
- Bring in porch furniture and anything the wind can throw.
- Fill the gas tank and charge phones before the storm arrives.
- 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 Delaware
Is Delaware 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 Warren County, 47% of homes in mapped flood zones carry federal flood insurance, and 1.1% of all homes do.
How much is flood insurance in Delaware?
FEMA’s Community Rating System list shows no discount for Delaware’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
Storm stories
Memories, warnings and help from neighbors in Delaware.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Delaware’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.