Area guideCommack
Water Damage Restoration Help in Commack, NY
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The hamlet of Commack · Towns of Huntington and Smithtown
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 Commack, 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 12,265 addresses in Commack 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.
Commack at a glanceTap a figure to see it on the map
Flood risk: LowFlood zone. None of the 12,265 addresses here is inside FEMA's mapped flood zone or within about 100 ft of it.
Groundwater. At 27 of the 12,265 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 12,238, water in a basement usually comes in from above.
Each square is about 750 ft across. Color shows the typical depth under its addresses (USGS map, spring 2013):
- Within 10 ft3
- 10 to 14 ft24
- 14 to 25 ft61
- Deeper than 25 ft12,177
Sewer. 488 of the 12,265 addresses in Commack have a county sewer main mapped past them. That does not mean every house is connected.
At the other 11,777, 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 750 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 Commack homes
Flooding is rarely the problem in Commack: none of its built-up land is in FEMA's flood zone. For homes here, the risks to know are a full or failing cesspool, water getting into the basement, pipes bursting in the cold and an aging pipe giving way.
- 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. Of the 12,265 addresses in Commack, 11,777 have no sewer main mapped past them and rely on a cesspool or septic tank; when a system backs up, the first sign is often sewage in a floor drain, a basement toilet or a shower. With public sewer covering about 3% of its built-up land, Commack is a mix of sewered and cesspool streets, and a backup has a different cause on each. Cesspool Overflow help in Commack
- Water in the basement. At about 97 ft down, Commack's water table is far below any basement, so if water shows up there, look first for a leaking pipe, a blocked gutter or runoff. Water drains quickly through the ground in Commack; a puddle that lingers beside the foundation is worth fixing with a downspout extension or regrading before it reaches the basement. Basement Flooding help in Commack
- A burst pipe. A frozen pipe that has not split yet can be saved: open the tap and warm the line gently from the tap end back, never with a flame. Pipes in outside walls, crawlspaces and unheated garages freeze first, and in Commack's homes, about 62 years old on average, much of that plumbing predates modern insulation. Frozen Pipe Burst help in Commack
- 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 75% of its homes built before 1970, Commack 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 Commack
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.
536 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 488 of 12,265 address points in Commack. On 11 streets nearly every address has one; the largest:
- Scarlett Dr — 118 addresses
- Ashley Cir — 53 addresses
- Madder Lake Cir — 42 addresses
- Peppermill Ct — 24 addresses
- Ron Ct — 20 addresses
- Rhett Ct — 19 addresses
- Cornell Dr S — 17 addresses
- Melanie Way — 14 addresses
Quick facts — Commack
Flood and storm
- FEMA flood zone
- X (minimal)
In an emergency
- Nearest fire department
- Commack Fire Department
- Nearest emergency shelter
- Commack 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
- 11725
Homes here
- Sewer status
- Unsewered (Cesspool/Septic)
- Home heating fuel
- 21% fuel oil Utility gas heats 73% of occupied homes in Commack. Census estimates; the oil figure is within 3 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 44% of Commack'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.
Commack and nearby areas
None of the other 6 areas compared here has a smaller mapped floodplain share than Commack.
- Kings Park 1.7%
- Commack 0.0%
- Brentwood 0.0%
- Dix Hills 0.0%
- East Northport 0.0%
- Elwood 0.0%
- Hauppauge 0.0%
Share of developed area inside FEMA's mapped floodplain, largest first.
3 of the other 6 areas compared here have shallower average groundwater than Commack.
- Hauppauge 43 ft
- Brentwood 46 ft
- Kings Park 85 ft
- Commack 97 ft
- Elwood 127 ft
- Dix Hills 129 ft
- East Northport 153 ft
Average depth to groundwater, shallowest first.
3 of the other 6 areas compared here have lower average ground than Commack.
- Hauppauge 86 ft
- Brentwood 92 ft
- Kings Park 121 ft
- Commack 154 ft
- Elwood 201 ft
- Dix Hills 201 ft
- East Northport 202 ft
Average height above sea level, lowest first.
Commack sits close to its surroundings here: 75% pre-1970 housing share against a 63% average across the 6 neighboring areas.
Compared with the areas around Commack. How we measured them.
Frequently asked questions about Commack
Is Commack in a flood zone?
Commack 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 Commack have public sewer, or cesspools?
Commack is unsewered — nearly every property runs on its own cesspool or septic system.
Where is the nearest emergency shelter to Commack?
The closest Suffolk County emergency shelter to Commack is Commack Middle School. Shelter openings vary by storm — confirm with Suffolk County OEM before traveling to one.
How deep is the water table in Commack?
The measured water table runs about 97 ft below the surface on average across Commack. It is mapped within 10 ft at 3 of 12,265 addresses and within 25 ft at 88.
About the figures for Commack
Check them at the source
Who to call for water damage in Commack
(631) 440-4144Tell us what is happening. We connect you with a local specialist who covers Commack.