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Flooded Basement Help in Mattituck, NY
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Water coming up through the basement floor or walls? Groundwater stays under most Mattituck basements, averaging about 22 ft down, but 487 addresses are mapped within 10 ft of it. Call and we'll connect you with a local specialist. Acting fast limits the damage.
- You call Tell us what you're seeing
- We connect you With a local specialist covering Mattituck
- They arrange A visit with you
- Water table ~22 ft on averagewithin 10 ft at 487 addresses
- Rain and roof runoff reach the wallsgutters, downspouts, grading
- Gets in at window wells and crackssurface water on most streets
Mattituck at a glanceWhat drives basement flooding here
Flood risk: High- water table depth
- 22ft
- of developed area in FEMA zone AE
- 12.7%
- of homes built before 1970
- 56%
Why basement flooding happens in Mattituck
The 22 ft average under Mattituck keeps groundwater below most basement floors. On the 487 address points mapped within 10 ft of it, seepage from standing groundwater stays a live explanation.
The difference between a wet floor and a rebuild is usually detection time. At roughly 26% seasonal occupancy, Mattituck has a lot of basements nobody checks between visits.
Start outside the house. Grade falling back toward the wall, and downspouts discharging at the corner, load a Mattituck foundation harder than a water table that sits below the floor, and both are cheap to correct.
A basement built 59 years ago in Mattituck was designed to be a cellar, not living space. 56% of the local stock comes from that period, and any finishing came later than the waterproofing did.
The first question in a Mattituck basement is whether the water is coming from outside the wall or inside a pipe. Rain-linked staining low on the wall points at water from outside; a steady wet patch in dry weather points at a supply line.
Separately from groundwater, about 12.7% of Mattituck's developed area falls inside the FEMA AE (100-yr floodplain) flood zone. Surface flooding and seepage are different failure modes and a basement can get both.
For context on flood damage in the area: since 1978, ZIP 11952 has recorded 207 NFIP flood insurance claims, with $3,831,323 paid. That figure covers the whole ZIP code, not Mattituck alone (why we report it that way), and NFIP policies do not cover groundwater seepage or a failed sump pump.
More local measurements for Mattituck
- Soil drainage
- Well drained
- Ground elevation
- 24 ft
- Hurricane Sandy high-water mark
- 8.8 ft The highest of 3 marks USGS surveyed in Mattituck after the 2012 storm, in feet above the NAVD88 datum. Mattituck's ground elevation on this page uses the same datum, so the two can be compared directly.
- Nearest fire department
- Mattituck Fire Department
Mattituck's land area
- FEMA coastal wave zone (VE)
- FEMA 100-year floodplain (AE, AO)
- The flood-zone figure above says how much of the land these zones cover.
Sources: FEMA NFHL / NOAA SLOSH, US Census ACS, USDA SSURGO, Suffolk County sewer districts — measured over developed land only. Verified 2026-10-18. How we measured this. Check them at source: FEMA flood map for Mattituck · Census profile for Mattituck · Permitted wastewater facilities in ZIP 11952
Streets wholly inside the flood zone
The flood map puts 173 of Mattituck's 2,912 address points inside a special flood hazard area: 157 in zone AE, 12 in zone VE and 4 in zone AO. On 1 street every address is inside it:
- Park Av Ext — all 10 addresses
Streets with the most addresses in the zone · How streets are counted
How Mattituck compares nearby
Mattituck is no outlier among its 6 neighbors for basement water: 12.7% of developed land in a flood zone, close to their 17.8% average.
| Area | Water table | In flood zone | Built pre-1970 |
|---|---|---|---|
| Mattituck | 22 ft | 12.7% | 56% |
| Cutchogue | 27 ft | 9.8% | 49% |
| Jamesport | 17 ft | 16.5% | 49% |
| Laurel | 22 ft | 3.9% | 46% |
| New Suffolk | 18 ft | 24.0% | 77% |
Neighbors are the nearest areas. How we measured this.
Basement Flooding help near Long Island Sound, Marratooka Pond and Great Peconic Bay
Under Mattituck, the water table averages 22 ft deep but sits much closer to the surface on some streets, and those are the basements that can take on water from below. Nearly every home in Mattituck runs on a cesspool or septic tank, so a backup here means sewage coming up through the lowest drain in the house.
When you call, we connect you with a local water damage specialist who will extract standing water, establish how far it traveled into walls and insulation, and dry the structure to a measured moisture content.
This page covers Mattituck, ZIP 11952.
Signs you need basement flooding help now
- Water seeping through your floor drain or walls
- Visible standing water on the basement floor
- A strong musty or sewage smell
- Damp walls or white mineral deposits (efflorescence)
- Sump pump running constantly or failing
Who to call for a flooded basement in Mattituck
(631) 440-4144Tell us what you are seeing. We connect you with a local specialist covering Mattituck who handles basement flooding.
Frequently asked questions about basement flooding in Mattituck
Why do basements flood in Mattituck?
On most streets, not from groundwater: the water table under Mattituck averages about 22 ft down, below a basement floor. But the USGS depth-to-water map puts it within 10 ft of the surface at 487 of 2,912 address points, and there it can press on the slab. Elsewhere, water reaching a basement came from the surface: roof discharge against the wall, ground falling back toward the house, a window well or a hatchway.
Is Mattituck in a flood zone?
Mattituck's FEMA-mapped zone is AE (100-yr floodplain), covering about 12.7% of the developed area, per FEMA's flood map (NFHL). Note that the flood zone describes surface flooding — groundwater seepage into a basement can happen well outside it.
Are older homes in Mattituck more at risk?
56% of Mattituck's housing predates 1970 and the average home is about 59 years old. Foundations from that period generally predate exterior waterproofing membranes, so seepage tends to show up there first.