Photo: G. Edward Johnson · CC BY 3.0FEMA expects less hazard damage per building in Kemp Mill than in 92% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Kemp Mill gets an A for hazard risk: lower expected damage per building than 92% of U.S. towns, #201 of 261 in Maryland. Most of that expected damage is river and rain flooding (75%). Flood insurance has paid 5 claims here since 1978.
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 Kemp Mill 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
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 Kemp Mill’s grade
River and rain flooding is 75% of the building damage FEMA expects in Kemp Mill, and Kemp Mill’s rate of river and rain flooding damage is lower than 79% of U.S. census tracts. Next is hurricanes at 10% (higher than 71% of U.S. census tracts).
A #201 of 261 in Maryland; lower expected damage per building than 92% of U.S. towns (21,298).
Kemp Mill’s residents live in 6 census tracts; FEMA’s figures are combined by where they live.
The typical Maryland town has lower expected damage than 97% of U.S. towns; within the state, Kemp Mill has more expected damage per building than 77% of Maryland towns.
In dollars, FEMA expects about $1.6M a year in losses across Kemp Mill: $1.2M to buildings, the rest to people and crops.
Does Kemp Mill flood? Rarely: 5 flood claims since 1978
Every paid claim on a federal flood insurance policy in Kemp Mill, from FEMA’s records: 1.0 per 1,000 homes, fewer than 77% of the 13,809 U.S. towns with a flood insurance record.
- The Mid-spring storms1 claim · $3K
Kemp Mill isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Montgomery County.The storms Kemp Mill remembers
None of the 17 disasters declared for Montgomery County shows FEMA aid or repair money reaching Kemp Mill itself in FEMA’s records, so these are its biggest flood-claim years.
- 19781 flood claims paidNo declaration for the county that year
- 19791 flood claims paidNo declaration for the county that year
- 20101 flood claims paidThe year of Severe Winter Storms and Snowstorms, declared for Montgomery County
Montgomery County has had 17 natural disasters declared by the President since 1953, most often winter storms, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Kemp Mill after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Kemp Mill archive →Kemp Mill and its neighbors
Kemp Mill is 6th of the 8 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Wheaton | A+less damage than 96% | river and rain flooding | 18 |
| Silver Spring | A+less damage than 96% | river and rain flooding | 16 |
| White Oak | A+less damage than 95% | river and rain flooding | 2 |
| Colesville | A+less damage than 95% | river and rain flooding | 5 |
| Forest Glen | A+less damage than 95% | river and rain flooding | 8 |
| Kemp Mill | Aless damage than 92% | river and rain flooding | 5 |
| Burnt Mills | Aless damage than 90% | river and rain flooding | 2 |
| Four Corners | A−less damage than 81% | river and rain flooding | 3 |
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 Kemp Mill 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.
- 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 Kemp Mill
Is Kemp Mill at risk for natural disasters?
On FEMA’s National Risk Index, Kemp Mill has lower expected damage per building than 92% of U.S. towns: A for hazard risk, #201 of 261 in Maryland. Most of the expected damage is river and rain flooding (75%) and hurricanes (10%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Kemp Mill flood?
Flood insurance has paid 5 claims in Kemp Mill since 1978, $19K in all, or 1.0 per 1,000 homes, fewer than 77% of U.S. towns with a flood insurance record. The most claims came from Mid-spring storms (1).
Is Kemp Mill 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 Montgomery County, 51% of homes in mapped flood zones carry federal flood insurance, and 0.8% of all homes do.
How much is flood insurance in Kemp Mill?
FEMA’s Community Rating System list shows no discount for Kemp Mill’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 Kemp Mill?
By flood claims, Mid-spring storms: 1 paid, $3K.
Is Kemp Mill at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (75%), and Kemp Mill’s rate for it is lower than 79% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Kemp Mill.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Kemp Mill’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.