Key facts: Norwalk
What the 1955 storms did
The Norwalk River runs down from Ridgefield and Wilton, takes in the Silvermine, and reaches the harbor.[2] Three storms hit in 1955, and tropical rain of about 12 to 14 inches that August produced the worst flood in the city's record.[1][3] River-corridor properties should know their flood zone before the next one.
A closer look in Norwalk
Finished basements on the hills
Mid-century neighborhoods above the river often have finished lower levels with carpet and drywall. Carpet pad holds water, so it usually goes even when the carpet can be saved. A straight flood cut above the water line lets the wall cavity dry, and that step is what prevents the musty smell months later.
Flood claims recorded in Fairfield County
Norwalk sits in Fairfield County. FEMA publishes every National Flood Insurance Program claim with personal details removed, which gives a plain record of where water has reached insured buildings here.
| Measure | Count |
|---|---|
| Flood insurance claims on record | 12,667 |
| Year with the most claims | 2012 (3,225) |
| Largest named event | Hurricane Sandy (3,172) |
| Claims outside high-risk A and V zones | 21% |
| Claims on buildings built before 1975 | 79% |
County-wide counts of insured claims only. Uninsured losses, burst pipes and appliance leaks are not in this data.
What the Norwalk claim record shows
For Norwalk homes, the local precedents are the events behind the most Fairfield County claims: Hurricane Sandy (3,172 claims), December Storm - Nor'Easter (1,540 claims) and Hurricane Irene (1,181 claims).
Around Norwalk, about 79% of county claims with a recorded zone came from the high-risk A and V zones, so checking your address on the FEMA flood map tells you a lot here.
If your Norwalk home is older, note that buildings from before 1975 make up 79% of county claims with a known build date. Many predate current flood maps, so inspect low outlets, ductwork and subfloors closely after any water event.
Federal disaster history for Fairfield County
FEMA lists 33 federal declarations covering Fairfield County. The most common types are hurricane (11), severe storm (8) and snowstorm (8). The latest are Severe Storm, Flooding, Landslides, and Mudslides in 2024, Severe Storms, Flooding, Landslides, and Mudslides in 2024 and Remnants of Hurricane Ida in 2021. If your loss falls inside an open declaration, Norwalk homeowners can check DisasterAssistance.gov as well as their insurance policy.
Norwalk weather and your home
Weather records for Norwalk from 2015 through 2024 average 51 inches of precipitation a year, and December and October are the wettest months. The area averages 11.1 days a year with an inch or more.
Norwalk falls to 20°F or below on about 17 nights a year, which puts pipes in exterior walls, crawl spaces and garages at risk.
When rain falls in Norwalk
Seasonal averages for Norwalk, 2015 through 2024. Plan roof, gutter and sump pump checks before the wettest stretch.
| Season | Average | Share of year |
|---|---|---|
| January to March | 12.6 in | 25% |
| April to June | 11.8 in | 23% |
| July to September | 13.1 in | 26% |
| October to December | 13.2 in | 26% |
Modeled from Open-Meteo historical weather data. Precipitation includes rain and melted snow.
Norwalk home checklist from these records
- Don't rely on recent quiet years. Only 10% of Fairfield County claims date from 2015 or later, so older floods still show what can happen.
- Insulate exposed pipes before 17-plus hard-freeze nights arrive, and know your main shutoff.
- Test any sump pump before December, since Norwalk averages 11 days a year with an inch or more.
- Keep dated photos of each room. After Hurricane Sandy, 3,172 insured Fairfield County owners filed claims at about the same time.
What to tell the Norwalk contractor
- Whether water came through a wall, floor or drain
- How high it reached on the walls
- Whether a sump pump is present and running
Services Norwalk callers ask about
Questions
Norwalk water damage questions
Why did my Norwalk basement flood with no river nearby?
Saturated soil can push water through foundation joints and floor drains. Heavy rain alone can do it, without any nearby river rising.
Can basement carpet be saved?
Clean-water carpet sometimes can if handled quickly. Carpet touched by flood or sewage water normally cannot.