Area guideBrentwood
Water Damage Restoration Help in Brentwood, NY
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The hamlet of Brentwood · 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 Brentwood, 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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None of the 11,750 addresses in Brentwood is in FEMA's flood zone, so the water that damages homes here usually comes from their own pipes and drains, not from a flood.
Brentwood at a glanceTap a figure to see it on the map
Flood risk: LowFlood zone. None of the 11,750 addresses here is inside FEMA's mapped flood zone or within about 100 ft of it.
Groundwater. At 563 of the 11,750 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 11,187, water in a basement usually comes in from above.
Each square is about 600 ft across. Color shows the typical depth under its addresses (USGS map, spring 2013):
- Within 10 ft168
- 10 to 14 ft395
- 14 to 25 ft2,115
- Deeper than 25 ft9,072
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 Brentwood homes
Flooding is rarely the problem in Brentwood: none of its built-up land is in FEMA's flood zone. What damages homes here is closer to home: a cesspool backing up, water getting into the basement, a pipe that freezes and splits and an aging pipe giving way.
- 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. Homes in Brentwood treat their own wastewater in a cesspool or septic tank, so when the system is full, slow drains and gurgling pipes come before sewage in the lowest drain. Cesspool Overflow help in Brentwood
- Water in the basement. Homeowners policies usually exclude groundwater seeping in, so photograph the damage and read your policy before the cleanup starts. The 46 ft average hides a spread: on some Brentwood streets groundwater comes close enough to a basement floor to seep in after a wet spell. Basement Flooding help in Brentwood
- 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 39% of Brentwood'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 Brentwood
- A leak in a wall or ceiling. 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. With 56% of its homes built before 1970, Brentwood 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 Brentwood
See how many of its addresses are mapped inside the FEMA flood zone and how deep groundwater is mapped under it.
339 streets, from county address records. Nothing you type is sent anywhere.
Quick facts — Brentwood
Flood and storm
- FEMA flood zone
- X (minimal)
- Water nearby
- Orowoc Creek to the south-east. Each direction is to its nearest point, from the center of Brentwood.
In an emergency
- Nearest fire department
- Brentwood Fire Department
- Nearest emergency shelter
- Brentwood Senior 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
- 11717
Homes here
- Sewer status
- Unsewered (Cesspool/Septic)
- Home heating fuel
- 39% fuel oil Utility gas heats 45% of occupied homes in Brentwood. 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
- 1960s 28% of Brentwood's homes were built in the 1960s, more than in any other decade band. Census estimate, within 4 points. Homes from the 1960s are about 60 years old. Past 30 years, an insurance-industry study (IBHS) found supply and drain pipe problems three times as likely.
Sources: FEMA NFHL / NOAA SLOSH, US Census ACS, USDA SSURGO, Suffolk County records. Verified 2026-10-18. How we measured this.
Brentwood and nearby areas
None of the other 6 areas compared here has a smaller mapped floodplain share than Brentwood.
- Central Islip 0.2%
- Brentwood 0.0%
- Baywood 0.0%
- Commack 0.0%
- Deer Park 0.0%
- Dix Hills 0.0%
- Hauppauge 0.0%
Share of developed area inside FEMA's mapped floodplain, largest first.
4 of the other 6 areas compared here have shallower average groundwater than Brentwood.
- Deer Park 20 ft
- Baywood 21 ft
- Central Islip 28 ft
- Hauppauge 43 ft
- Brentwood 46 ft
- Commack 97 ft
- Dix Hills 129 ft
Average depth to groundwater, shallowest first.
4 of the other 6 areas compared here have lower average ground than Brentwood.
- Baywood 64 ft
- Central Islip 64 ft
- Deer Park 71 ft
- Hauppauge 86 ft
- Brentwood 92 ft
- Commack 154 ft
- Dix Hills 201 ft
Average height above sea level, lowest first.
Brentwood's sewer coverage is 0%, close to the 10% average across the 6 areas around it — a typical reading for the area rather than an outlier.
Compared with the areas around Brentwood. How we measured them.
Frequently asked questions about Brentwood
Is Brentwood in a flood zone?
Brentwood has no developed land inside a FEMA special flood hazard area, per FEMA's flood map (NFHL). The flood map describes surface flooding only, so it says nothing about groundwater, sewer or plumbing failures.
Does Brentwood have public sewer, or cesspools?
Brentwood is unsewered — nearly every property runs on its own cesspool or septic system.
Where is the nearest emergency shelter to Brentwood?
The closest Suffolk County emergency shelter to Brentwood is Brentwood Senior High School. Shelter openings vary by storm — confirm with Suffolk County OEM before traveling to one.
How deep is the water table in Brentwood?
The measured water table runs about 46 ft below the surface on average across Brentwood. It is mapped within 10 ft at 168 of 11,750 addresses and within 25 ft at 2,678.
About the figures for Brentwood
Check them at the source
Who to call for water damage in Brentwood
(631) 440-4144Tell us what is happening. We connect you with a local specialist who covers Brentwood.