Area guideWest Islip
Water Damage Restoration Help in West Islip, NY
Connect with a local specialist now.
The hamlet of West Islip · Town of Islip
Water in the basement, a burst pipe, or sewage backing up into the house? Call and we'll connect you with a local specialist who covers West Islip, even if you don't know the cause yet.
Water doesn't stay where it lands. It soaks into drywall, insulation and flooring, and mold can start within 24 to 48 hours.
- You call Tell us what you're seeing
- We connect you With a local specialist covering all of West Islip
- They arrange A visit with you
Since 1978, federal flood insurance has paid $62.6 million on 1,530 claims in ZIP 11795, which takes in West Islip, so water has reached homes here before.
West Islip at a glanceTap a figure to see it on the map
Flood risk: HighFlood zone. 368 of the 8,924 addresses here are inside FEMA's mapped flood zone. 700 more are within about 100 ft of its edge.
If your home is in it, most mortgage lenders must require flood insurance. That is a separate policy from homeowner's insurance, which usually covers a burst pipe or leaking appliance.
The percentage above counts all developed land, including lawns, parks and roads, not just homes.
Each square is about 600 ft across. Color shows how many of its addresses are mapped inside the zone:
- Fewer than half
- Half or more
- All
Groundwater. At 8,027 of the 8,917 addresses measured here, groundwater is within 14 ft of the surface, close enough to reach a basement floor.
In those basements, water can seep up through the floor and come back after pumping until the ground drains. The 890 measured deeper are the exception.
7 addresses fall where the groundwater map has no reading.
Each square is about 600 ft across. Color shows the typical depth under its addresses (USGS map, spring 2013):
- Within 10 ft5,746
- 10 to 14 ft2,281
- 14 to 25 ft890
Sewer. 8,013 of the 8,924 addresses in West Islip have a county sewer main mapped past them. That does not mean every house is connected.
Where a house is connected, a backup is a blocked line. A plumber clears the pipe to the street. The sewer district clears the main.
Each square is about 600 ft across. Color shows how many of its addresses have a mapped main:
- Fewer than half
- Half or more
- All
What is happening at your home?
Other water emergencies we cover
Not sure which one fits? Call (631) 440-4144 and tell us what you see.
Why water gets into West Islip homes
West Islip has two kinds of water risk: flooding from outside, and inside the house, a sewer line backing up, water rising through the basement floor, a pipe that freezes and splits and an aging pipe giving way.
- Water coming in from outside. Floodwater can carry sewage and fuel oil, so treat everything it touched as contaminated and keep children away until it has been cleaned. FEMA puts 6.9% of West Islip's built-up land in its flood zone; a home there has about a 1-in-4 chance of flooding over a 30-year mortgage. Since 1978, policyholders in ZIP 11795 have filed 1,530 federal flood insurance claims, a record of flood water reaching buildings in this ZIP. Look up your street. Storm Damage Restoration help
- Sewage coming up a drain. Standard homeowners policies usually exclude sewage backup unless a water-backup endorsement was added, so check yours and photograph the damage before cleanup starts. With West Islip on public sewer, roots and grease in the line to the street are a common cause of a backup, and the first place it shows is a basement floor drain or a low toilet. Sewage Backup help in West Islip
- Water in the basement. Groundwater in a basement returns after a pump-out unless a sump pump keeps up, so drying the walls and floor matters as much as removing the water. West Islip's groundwater sits only about 8 ft down, within reach of a basement floor, which is why water can come up from below even when it is not raining. Basement Flooding help in West Islip
- A burst pipe. If a pipe bursts, shut the main water valve first; a split supply line keeps running at full pressure until someone does. About 43% of West Islip's homes heat with fuel oil, and a tank that runs dry in a cold snap takes the heat with it; pipes in outside walls and crawlspaces freeze first. Frozen Pipe Burst help in West Islip
- A leak in a wall or ceiling. Mold can start on wet drywall within a day or two, so a slow leak needs the wall opened and dried, not just the pipe fixed. With 75% of its homes built before 1970, West Islip has a lot of original plumbing, and an old pipe tends to fail slowly, as a stain or a soft floor, before it fails all at once. Ceiling & Roof Leak Water Damage help
Insurance and safety guidance from FEMA FloodSmart, the CDC and the Red Cross. How we measured the figures.
Street by street in West Islip
See how many of its addresses are mapped inside the FEMA flood zone, how deep groundwater is mapped under it, and whether a sewer main is mapped past it.
332 streets, from county address records. Nothing you type is sent anywhere.
Streets inside the FEMA flood zone
368 of 8,924 address points in West Islip are mapped inside a FEMA special flood hazard area. These streets hold the most of them:
- Sequams Ln W — 49 of 50 addresses
- West Islip Rd — 47 of 57 addresses
- Sequams Lane Ctr — 41 of 41 addresses
- Sequams Ln E — 28 of 39 addresses
- Eaton Ln — 28 of 51 addresses
- W Bay Dr — 25 of 38 addresses
- E Bay Dr — 25 of 38 addresses
- Secatogue Ln W — 16 of 34 addresses
Streets with a mapped sewer main
County records map an active sewer main past 8,013 of 8,924 address points in West Islip. On 273 streets nearly every address has one; the largest:
- Hyman Ave — 196 addresses
- Oak Neck Rd — 190 addresses
- Higbie Ln — 187 addresses
- Myrtle Ave — 136 addresses
- Udall Rd — 135 addresses
- Everdell Ave — 127 addresses
- Gladstone Ave — 123 addresses
- Mccall Ave — 116 addresses
Quick facts — West Islip
Flood and storm
- FEMA flood zone
- AE (100-yr floodplain)
- Hurricane Sandy high-water mark
- 6.2 ft The highest of 2 marks USGS surveyed in West Islip after the 2012 storm, in feet above the NAVD88 datum — a reading at one point, not a level across all of West Islip. Ground elevation here averages 21 ft on the same datum.
- Water nearby
-
Great South Bay to the south, Keith Canal to the south and Guggenheim Lakes to the north.
Each direction is to its nearest point, from the center of West Islip.
All 8 named water features
- North: Guggenheim Lakes
- East: Trues Creek
- South: Great South Bay, Keith Canal
- South-west: Lake Capri, Skookwams Creek
- West: Sampawams Creek
- North-west: Willetts Creek
West Islip's land area
- FEMA coastal wave zone (VE)
- FEMA 100-year floodplain (AE)
- The flood-zone figure above says how much of the land these zones cover.
Homes here
- Sewer status
- Sewered
- Home heating fuel
- 43% fuel oil Utility gas heats 51% of occupied homes in West Islip. Census estimates; the oil figure is within 4 points. An oil tank can float or tip in a flood and spill. That is a separate cleanup from the water (NYS DEC). In a cold snap, an empty tank means no heat.
- When homes were built
- 1950s 39% of West Islip's homes were built in the 1950s, more than in any other decade band. Census estimate, within 4 points. Homes from the 1950s are about 70 years old. Past 30 years, an insurance-industry study (IBHS) found supply and drain pipe problems three times as likely.
In an emergency
- Nearest fire department
- West Islip Fire Department
- Nearest emergency shelter
- North Babylon High SchoolNot every shelter opens for every storm, and the nearest may stay closed. Suffolk County announces which ones open; follow its alerts and local news before you go.
- ZIP code
- 11795
Sources: FEMA NFHL / NOAA SLOSH, US Census ACS, USDA SSURGO, Suffolk County records. Verified 2026-10-18. How we measured this.
West Islip and nearby areas
2 of the other 6 areas compared here have a larger mapped floodplain share than West Islip.
- Babylon 24.5%
- Bay Shore 7.6%
- West Islip 6.9%
- West Bay Shore 3.8%
- North Babylon 0.4%
- Baywood 0.0%
- Deer Park 0.0%
Share of developed area inside FEMA's mapped floodplain, largest first.
1 of the other 6 areas compared here has shallower average groundwater than West Islip.
- Babylon 6 ft
- West Bay Shore 8 ft
- West Islip 8 ft
- North Babylon 10 ft
- Bay Shore 12 ft
- Deer Park 20 ft
- Baywood 21 ft
Average depth to groundwater, shallowest first.
2 of the other 6 areas compared here have lower average ground than West Islip.
- Babylon 12 ft
- West Bay Shore 18 ft
- West Islip 21 ft
- Bay Shore 31 ft
- North Babylon 36 ft
- Baywood 64 ft
- Deer Park 71 ft
Average height above sea level, lowest first.
West Islip's sewer coverage is 91%, against a 61% average across the 6 areas around it. West Islip is more sewered than the areas around it.
Compared with the areas around West Islip. How we measured them.
Frequently asked questions about West Islip
Is West Islip in a flood zone?
West Islip's FEMA-mapped flood zone is AE (100-yr floodplain), covering about 6.9% of the developed area, per FEMA's flood map (NFHL).
Does West Islip have public sewer, or cesspools?
West Islip is on public sewer — about 91% of developed land sits inside an active sewer district, so backups here usually trace to the municipal main or your lateral.
How deep is the water table in West Islip?
The measured water table runs about 8 ft below the surface on average across West Islip. It is mapped within 10 ft at 5,746 of 8,924 addresses and within 25 ft at 8,917.
How old are homes in West Islip?
The average home in West Islip is about 66 years old, and 75% of the housing stock predates 1970 — older plumbing and unwaterproofed foundations are a common factor in local water damage.
About the figures for West Islip
Check them at the source
Who to call for water damage in West Islip
(631) 440-4144Tell us what is happening. We connect you with a local specialist who covers West Islip.