Area guideCentral Islip
Water Damage Restoration Help in Central Islip, NY
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The hamlet of Central 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 Central 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.
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Only 3 of the 9,354 addresses in Central Islip are in FEMA's flood zone, so the water that damages homes here usually comes from their own pipes and drains, not from a flood.
Central Islip at a glanceTap a figure to see it on the map
Flood zone AFlood zone. 3 of the 9,354 addresses here are inside FEMA's mapped flood zone. 14 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 550 ft across. Color shows how many of its addresses are mapped inside the zone:
- Fewer than half
Groundwater. At 864 of the 9,354 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. At the other 8,490, water in a basement usually comes in from above.
Each square is about 550 ft across. Color shows the typical depth under its addresses (USGS map, spring 2013):
- Within 10 ft498
- 10 to 14 ft366
- 14 to 25 ft3,021
- Deeper than 25 ft5,469
Sewer. 1,332 of the 9,354 addresses in Central Islip have a county sewer main mapped past them. That does not mean every house is connected.
At the other 8,022, a backup means a cesspool or septic tank, and a pumping company. On a main, it means a plumber, or the sewer district if the main is blocked.
Each square is about 550 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 Central Islip homes
Central Islip sits almost entirely outside FEMA's flood zone (less than 1% of its built-up land is in it). What damages homes here is closer to home: a wet basement, a cesspool backing up and old plumbing leaking inside the walls.
- Water in the basement. Homeowners policies usually exclude groundwater seeping in, so photograph the damage and read your policy before the cleanup starts. Under Central Islip, the water table averages 28 ft deep but sits much closer to the surface on some streets, and those are the basements that can take on water from below. Basement Flooding help in Central Islip
- Sewage coming up a drain. Anything porous the sewage reaches, such as carpet or drywall, usually has to come out, and what stays has to be disinfected before it is dried. In Central Islip, 8,022 of 9,354 addresses send their wastewater to a cesspool or septic tank in the yard, with no sewer main mapped past them, and a system that is full or failing has nowhere to send it but back into the house. Only about 25% of Central Islip's built-up land is on public sewer, so whether a backup is a cesspool problem or a sewer-line problem depends on which side of the district line you are on. Cesspool Overflow help in Central Islip
- A leak or a burst pipe. A leak caught early is a drying job; one that has run for weeks inside a wall is a mold job, so have it opened up and dried properly. About 52% of Central Islip's homes were built before 1970, and pipes from that era, galvanized steel and cast iron, corrode from the inside until a joint or a section gives way. If a pipe bursts, shut the main water valve first; a split supply line keeps running at full pressure until someone does. 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 Central 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.
244 streets, from county address records. Nothing you type is sent anywhere.
Streets with a mapped sewer main
County records map an active sewer main past 1,332 of 9,354 address points in Central Islip. On 26 streets nearly every address has one; the largest:
- Bishop Mcgann Dr — 125 addresses
- Sprucewood Blvd — 96 addresses
- Beech St — 69 addresses
- Broadlawn Dr — 59 addresses
- Cherry St — 53 addresses
- Northwood Blvd — 48 addresses
- Walnut St — 47 addresses
- Elm St — 46 addresses
Quick facts — Central Islip
Flood and storm
- FEMA flood zone
- A (approximate 100-yr floodplain)A small area, with 3 addresses mapped inside it.
- Water nearby
- Connetquot Brook to the east and Champlin Creek to the south. Each direction is to its nearest point, from the center of Central Islip.
Central Islip's land area
- FEMA 100-year floodplain (A)
- The flood-zone figure above says how much of the land these zones cover.
Homes here
- Sewer status
- Partially Sewered
- Home heating fuel
- 31% fuel oil Utility gas heats 52% of occupied homes in Central Islip. Census estimates; the oil figure is within 6 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
- Spread across decades The highlighted 1960s band is the largest, at 22%, but its lead over the 1950s band (21%) is inside the Census margin of error (4 points), so no decade clearly leads in Central Islip. Most homes here are over 30 years old. Past that age, an insurance-industry study (IBHS) found supply and drain pipe problems three times as likely.
In an emergency
- Nearest fire department
- Central Islip Fire Department
- Nearest emergency shelter
- East Islip Middle 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
- 11722
Sources: FEMA NFHL / NOAA SLOSH, US Census ACS, USDA SSURGO, Suffolk County records. Verified 2026-10-18. How we measured this.
Central Islip and nearby areas
1 of the other 6 areas compared here has a larger mapped floodplain share than Central Islip.
- Islip 4.4%
- Central Islip 0.2%
- Bohemia 0.0%
- Brentwood 0.0%
- Hauppauge 0.0%
- Islandia 0.0%
- Islip Terrace 0.0%
Share of developed area inside FEMA's mapped floodplain, largest first.
At 25%, Central Islip's sewer coverage tracks the 6 areas around it, which average 33%. Nothing unusual for this part of the county.
Compared with the areas around Central Islip. How we measured them.
Frequently asked questions about Central Islip
Is Central Islip in a flood zone?
Central Islip's FEMA-mapped flood zone is A (approximate 100-yr floodplain), covering about 0.2% of the developed area, per FEMA's flood map (NFHL).
Does Central Islip have public sewer, or cesspools?
Central Islip is partially sewered: roughly 25% of developed land is inside an active sewer district, so whether you're on a cesspool depends on your street.
How deep is the water table in Central Islip?
The measured water table runs about 28 ft below the surface on average across Central Islip. It is mapped within 10 ft at 498 of 9,354 addresses and within 25 ft at 3,885.
How old are homes in Central Islip?
The average home in Central Islip is about 57 years old, and 52% of the housing stock predates 1970 — older plumbing and unwaterproofed foundations are a common factor in local water damage.
About the figures for Central Islip
Check them at the source
Who to call for water damage in Central Islip
(631) 440-4144Tell us what is happening. We connect you with a local specialist who covers Central Islip.