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Flooded Basement Help in North Patchogue, NY
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Water coming up through the basement floor or walls? Groundwater stays under most North Patchogue basements, averaging about 18 ft down, but 256 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 North Patchogue
- They arrange A visit with you
- Water table ~18 ft on averagewithin 10 ft at 256 addresses
- Rain and roof runoff reach the wallsgutters, downspouts, grading
- Gets in at window wells and crackssurface water on most streets
North Patchogue at a glanceWhat drives basement flooding here
Flood risk: Medium- water table depth
- 18ft
- of developed area in FEMA zone A
- 3.6%
- of homes built before 1970
- 63%
Why basement flooding happens in North Patchogue
With 63% of the housing stock built before 1970 and an average age of 64 years, most North Patchogue basements were built to a standard that assumed the water would be kept out by grading rather than by the wall.
Worth knowing before it happens: a standard homeowners policy generally excludes water that seeps in through a foundation, and NFIP flood policies cover surface flooding, which in North Patchogue means the 3.6% of developed area inside FEMA zone A (approximate 100-yr floodplain). Rain finding its way through a wall can fall between the two.
With excessively drained soil across North Patchogue, the wall spends little time loaded in ordinary rain. That makes an intense storm, rather than a wet week, the condition worth planning for.
Depth to groundwater in North Patchogue averages around 18 ft. For most houses that leaves surface water as the likelier cause; for the 256 address points the USGS depth-to-water map puts within 10 ft of it, groundwater belongs on the list.
With roughly 0% sewer coverage and groundwater about 18 ft down, a North Patchogue basement can take water from a leaching field that has stopped accepting flow. The tell is usually odor rather than volume.
Start outside the house. Grade falling back toward the wall, and downspouts discharging at the corner, load a North Patchogue foundation harder than a water table that sits below the floor, and both are cheap to correct.
For context on flood damage in the area: since 1978, ZIP 11772 has recorded 824 NFIP flood insurance claims, with $26,320,358 paid. That figure covers the whole ZIP code, not North Patchogue alone (why we report it that way), and NFIP policies do not cover groundwater seepage or a failed sump pump.
More local measurements for North Patchogue
- Soil drainage
- Excessively drained
- Ground elevation
- 42 ft
- Nearest fire department
- North Patchogue Fire Department
North Patchogue's land area
- FEMA 100-year floodplain (A)
- 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 North Patchogue · Census profile for North Patchogue · Permitted wastewater facilities in ZIP 11772
Groundwater under North Patchogue's streets
At 457 of 2,388 address points in North Patchogue, the USGS depth-to-water map puts groundwater within 14 ft of the surface, close enough to reach a basement floor when it rises. By the median of its addresses, the shallowest street is Cedar St, about 2 ft down.
How North Patchogue compares nearby
For basement water, North Patchogue reads much like the 5 areas around it — 63% of homes built before 1970 here, against a 49% average next door — so what applies here largely applies around it too.
| Area | Water table | In flood zone | Built pre-1970 |
|---|---|---|---|
| North Patchogue | 18 ft | 3.6% | 63% |
| Bayport | 15 ft | 9.1% | 55% |
| Blue Point | 13 ft | 15.4% | 54% |
| East Patchogue | 15 ft | 7.7% | 49% |
| Holtsville | 53 ft | 0.7% | 30% |
Neighbors are the nearest areas. How we measured this.
Basement Flooding help near Canaan Lake, Great Patchogue Lake and Tuthills Creek
North Patchogue's water table averages 18 ft, but on some streets it sits close enough to wet a basement floor, so whether seepage is a risk depends on the street. Rain soaks into North Patchogue's soil quickly, so water that pools against the house after a storm usually points to a gutter, a downspout or the grading.
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 North Patchogue, ZIP 11772.
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 North Patchogue
(631) 440-4144Tell us what you are seeing. We connect you with a local specialist covering North Patchogue who handles basement flooding.
Frequently asked questions about basement flooding in North Patchogue
Why do basements flood in North Patchogue?
On most streets, not from groundwater: the water table under North Patchogue averages about 18 ft down, below a basement floor. But the USGS depth-to-water map puts it within 10 ft of the surface at 256 of 2,388 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 North Patchogue in a flood zone?
North Patchogue's FEMA-mapped zone is A (approximate 100-yr floodplain), covering about 3.6% 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 North Patchogue more at risk?
63% of North Patchogue's housing predates 1970 and the average home is about 64 years old. Foundations from that period generally predate exterior waterproofing membranes, so seepage tends to show up there first.