Photo: John Phelan · CC BY-SA 4.0FEMA puts Ayer’s expected hazard damage per building below that of 95% of U.S. towns, mostly from river and rain flooding
On FEMA’s National Risk Index, Ayer gets an A+ for hazard risk: lower expected damage per building than 95% of U.S. towns, #11 of 283 in Massachusetts. Most of that expected damage is river and rain flooding (66%), then hurricanes (13%). Flood insurance has paid 3 claims here since 1987.
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 Ayer 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 Ayer’s grade
River and rain flooding is 66% of the building damage FEMA expects in Ayer, and Ayer’s rate of river and rain flooding damage is lower than 89% of U.S. census tracts. Ice storms add 4%, at a rate in the top 8% of U.S. census tracts.
A+ #11 of 283 in Massachusetts; lower expected damage per building than 95% of U.S. towns (21,298).
Ayer’s residents live in 2 census tracts; FEMA’s figures are combined by where they live.
The typical Massachusetts town has lower expected damage than 76% of U.S. towns; within the state, Ayer has less expected damage per building than 96% of Massachusetts towns.
In dollars, FEMA expects about $1.7M a year in losses across Ayer: $1.5M to buildings, the rest to people and crops.
Does Ayer flood? Rarely: 3 flood claims since 1987
Every paid claim on a federal flood insurance policy in Ayer, from FEMA’s records: 0.8 per 1,000 homes, fewer than 83% of the 13,809 U.S. towns with a flood insurance record.
- The April 2007 nor’easter1 claim · $3K
Ayer isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Middlesex County.15 federal disasters brought FEMA money to Ayer
Disasters that paid out in Ayer itself (aid to households or repair grants to the Town of Ayer), newest first, with that year’s flood claims.
- 2018Severe Winter Storm and Snowstorm$57K to the Town of Ayer for repairs
- 2015Severe Winter Storm, Snowstorm, and Flooding$70K to the Town of Ayer for repairs
- 2013Severe Winter Storm, Snowstorm, and Flooding$31K to the Town of Ayer for repairs
- 2011Severe Storm and Snowstorm$6K to the Town of Ayer for repairs
- 2011Hurricane Irene$2K to the Town of Ayer for repairs
- 2011Severe Winter Storm and Snowstorm$27K to the Town of Ayer for repairs
Show all 15
- 2010Severe Storms and Flooding20 households applied for aid$26K aid approved$119K to the Town of Ayer for repairs
- 2008Severe Winter Storm and Flooding$21K to the Town of Ayer for repairs
- 2006Severe Storms and Flooding3 households applied for aid$3K aid approved
- 2005Severe Storms and Flooding1 households applied for aid$589 aid approved
- 2005Record And/or Near Record Snow$35K to the Town of Ayer for repairs
- 2004Flooding2 households applied for aid$3K aid approved
- 2003Snow$33K to the Town of Ayer for repairs
- 2003Snow$21K to the Town of Ayer for repairs
- 2001Snow$23K to the Town of Ayer for repairs
Middlesex County has had 27 natural disasters declared by the President since 1953, most often winter storms, then hurricanes and tropical storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Ayer after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Ayer archive →Ayer and its neighbors
Ayer has the lowest expected damage per building of the 5 graded towns here. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Ayer | A+less damage than 95% | river and rain flooding | 3 |
| Littleton | Aless damage than 93% | river and rain flooding | 12 |
| Harvard | Aless damage than 90% | river and rain flooding | — |
| Shirley | Aless damage than 88% | river and rain flooding | 9 |
| Groton | A−less damage than 84% | river and rain flooding | 1 |
| Devens | — | a Census area inside a town; graded with the town | |
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 Ayer 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 Ayer
Is Ayer at risk for natural disasters?
On FEMA’s National Risk Index, Ayer has lower expected damage per building than 95% of U.S. towns: A+ for hazard risk, #11 of 283 in Massachusetts. Most of the expected damage is river and rain flooding (66%) and hurricanes (13%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Ayer flood?
Flood insurance has paid 3 claims in Ayer since 1987, $12K in all, or 0.8 per 1,000 homes, fewer than 83% of U.S. towns with a flood insurance record. The most claims came from April 2007 Nor'easter (1).
Is Ayer 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 Middlesex County, 54% of homes in mapped flood zones carry federal flood insurance, and 1.0% of all homes do.
How much is flood insurance in Ayer?
FEMA’s Community Rating System list shows no discount for Ayer’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 Ayer?
By FEMA money that reached Ayer, Severe Storms and Flooding (2010): 20 households applied for aid, $26K approved, and $119K to the Town of Ayer for repairs. By flood claims, April 2007 Nor'easter: 1 paid, $3K.
Is Ayer at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (66%), and Ayer’s rate for it is lower than 89% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Ayer.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Ayer’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.