Area guideEast Islip
Water Damage Restoration Help in East Islip, NY
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The hamlet of East 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 East 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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Since 1978, federal flood insurance has paid $3.9 million on 152 claims in ZIP 11730, which takes in East Islip, so water has reached homes here before.
East Islip at a glanceTap a figure to see it on the map
Flood risk: MediumFlood zone. 8 of the 4,554 addresses here are inside FEMA's mapped flood zone. 99 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 450 ft across. Color shows how many of its addresses are mapped inside the zone:
- Fewer than half
- Half or more
- All
Groundwater. At 4,505 of the 4,553 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 48 measured deeper are the exception.
1 address falls where the groundwater map has no reading.
Each square is about 450 ft across. Color shows the typical depth under its addresses (USGS map, spring 2013):
- Within 10 ft3,598
- 10 to 14 ft907
- 14 to 25 ft48
Sewer. 4,134 of the 4,554 addresses in East 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 450 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 East Islip homes
In East Islip, flooding is the outside risk, and inside the house the risks are a blocked sewer line, groundwater coming up into the basement, pipes bursting in the cold and an aging pipe giving way.
- Water coming in from outside. Flood insurance covers only basics below ground level, such as the furnace, the water heater, the electrical panel and unfinished walls, not finished floors or belongings stored there. FEMA's flood zone covers about 4% of East Islip's built-up land, and homes on those streets with a federally backed mortgage must carry flood insurance. Since 1978, policyholders in ZIP 11730 have filed 152 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. Sewage in the house is contaminated water, so it needs a crew that cleans, disinfects and dries, not a mop and a fan. With East 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 East Islip
- Water in the basement. Homeowners policies usually exclude groundwater seeping in, so photograph the damage and read your policy before the cleanup starts. East Islip's groundwater sits only about 9 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 East 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 53% of East 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 East 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. About 79% of East 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. 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 East 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.
171 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 4,134 of 4,554 address points in East Islip. On 132 streets nearly every address has one; the largest:
- Marilynn St — 138 addresses
- Jefferson St — 128 addresses
- E Madison St — 120 addresses
- Timberpoint Rd — 109 addresses
- E Main St — 100 addresses
- Adams St E — 98 addresses
- Union Blvd — 94 addresses
- Keswick Dr — 93 addresses
Quick facts — East Islip
Flood and storm
- FEMA flood zone
- AE (100-yr floodplain)
- Hurricane evacuation zone
- Zone C Zones run A to E. A evacuates first.
- Hurricane Sandy high-water mark
- 5.7 ft The one mark USGS surveyed in East Islip after the 2012 storm, in feet above the NAVD88 datum — a reading at one point, not a level across all of East Islip. Ground elevation here averages 17 ft on the same datum.
- Water nearby
-
Great South Bay to the south-west, Knapps Lake to the north-west and Upper Winganhauppauge Lake to the west.
Each direction is to its nearest point, from the center of East Islip.
All 6 named water features
- South: Quintuck Creek
- South-west: Great South Bay
- West: Upper Winganhauppauge Lake, Lower Winganhauppauge Lake, Champlin Creek
- North-west: Knapps Lake
East 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
- 53% fuel oil Utility gas heats 27% of occupied homes in East Islip. Census estimates; the oil figure is within 8 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 36% of East Islip's homes were built in the 1950s, more than in any other decade band. Census estimate, within 7 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
- East 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
- 11730
Sources: FEMA NFHL / NOAA SLOSH, US Census ACS, USDA SSURGO, Suffolk County records. Verified 2026-10-18. How we measured this.
East Islip and nearby areas
3 of the other 5 areas compared here have a larger mapped floodplain share than East Islip.
- Oakdale 26.4%
- Great River 22.3%
- Islip 4.4%
- East Islip 4.0%
- North Great River 0.2%
- Islip Terrace 0.0%
Share of developed area inside FEMA's mapped floodplain, largest first.
East Islip measures 92% on sewer coverage, where its 5 neighbors average 38%. East Islip is more sewered than the areas around it. It stands apart on pre-1970 housing share too: 79% here against 61% across the same neighbors. East Islip's housing stock is older than that of the areas around it.
Compared with the areas around East Islip. How we measured them.
Frequently asked questions about East Islip
Is East Islip in a flood zone?
East Islip's FEMA-mapped flood zone is AE (100-yr floodplain), covering about 4.0% of the developed area, per FEMA's flood map (NFHL).
Does East Islip have public sewer, or cesspools?
East Islip is on public sewer — about 92% of developed land sits inside an active sewer district, so backups here usually trace to the municipal main or your lateral.
Where is the nearest emergency shelter to East Islip?
The closest Suffolk County emergency shelter to East Islip is East Islip Middle School. Shelter openings vary by storm — confirm with Suffolk County OEM before traveling to one.
How deep is the water table in East Islip?
The measured water table runs about 9 ft below the surface on average across East Islip. It is mapped within 10 ft at 3,598 of 4,554 addresses and within 25 ft at 4,553.
About the figures for East Islip
Check them at the source
Who to call for water damage in East Islip
(631) 440-4144Tell us what is happening. We connect you with a local specialist who covers East Islip.