Old Greenwich’s biggest natural hazard is inland flooding
Most of the natural-hazard damage FEMA expects in Old Greenwich comes from inland flooding, and overall the risk is high for a U.S. community.
What stands out about Old Greenwich’s weather risks
Read from FEMA’s records below. The page puts what stands out first.
What Old Greenwich faces
Each hazard’s share of the damage FEMA expects here, and how it compares with the rest of the country.
Inland flooding
Coastal flooding
Hurricanes
How exposed is Old Greenwich?
FEMA expects yearly storm and flood damage to homes and buildings here to be higher than in 62% of U.S. communities, mostly from inland flooding and coastal flooding.
Rated higher than 116 of the 177 Connecticut towns we cover.
Old Greenwich covers 1 census tract, combined by population.
Does Old Greenwich flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Old Greenwich. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Old Greenwich isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: the county.Get ready for what Old Greenwich actually faces
A short kit for its top hazards, 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.
- Know your evacuation zone and the way off the coast.
- Storm surge comes fast: leave when you’re told, not when the water arrives.
- Move cars to high ground before king tides and nor’easters.
- 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.
Old Greenwich and its neighbors
Old Greenwich has the lowest rating of the 3 towns around it. Tap a town to see its hazards.
Rating = expected yearly storm and flood damage as a share of what’s there, vs. U.S. communities. Flood claims = paid federal flood insurance claims on record.
What these numbers can and can’t tell you
- An average, not a forecast. FEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
- Compared by rate. “Higher than N%” compares yearly damage as a share of what’s there, so a big city isn’t rated riskier just for having more buildings.
- Money that reached town. Flood claims are matched to Old Greenwich’s own flood-insurance community; household aid to the registrant’s city; repair grants to Old Greenwich.
- It follows property value. FEMA’s model weighs damage to buildings, so a place that recently lost many homes can rate lower than it feels. Across Old Greenwich, expected losses total about $3.1M a year, counting buildings, people and crops.
Storm stories
Memories, warnings and help from neighbors in Old Greenwich.
Your answer becomes a post in Town Square.
Sources: FEMA National Risk Index (December 2025); 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. Census tracts: U.S. Census Bureau. Preparedness tips: Ready.gov. An average of past damage, not a forecast.