Standing water in your basement can damage your foundation and start mold growing within 24 to 48 hours. We connect you with a local specialist who handles it.
Basement flooding can damage foundations, electrical systems, and personal belongings within hours. Mold begins forming within 24–48 hours of water intrusion.
When you call, we connect you with a local water damage specialist who will extract standing water, establish how far it traveled into walls and insulation, and dry the structure to a measured moisture content.
Call now, or can it wait?
Call now if
Water is near outlets, the electrical panel, a furnace or a water heater — stay out and call.
Water is coming in faster than a wet vac can keep up with.
The water smells of sewage. That is a different, contaminated problem and should not be handled like clean water.
It can usually wait for a scheduled visit if
A damp patch or a trickle after rain that stops on its own.
White mineral deposits on a wall with no standing water.
What Suffolk County measures for basement flooding
Whether basement water in Suffolk County comes up from the ground depends on where you are. The county median water table sits about 31 ft below the surface, ranging 4–153 ft, and it reaches a basement floor only within about 14 ft. It is mapped that shallow under half or more of the addresses in 36 of the 155 areas we cover; elsewhere, rain, runoff and plumbing are the likelier sources of basement water.
Housing age compounds it: across the county about 50% of the stock predates 1970, broadly before exterior waterproofing membranes were standard.
Basement Flooding drivers across Suffolk County, town by town
Town
Areas
Water table ≤ 25 ft
Median water table
Median built pre-1970
Babylon
13
11
12 ft
70%
Brookhaven
44
10
46 ft
48%
East Hampton
8
2
36 ft
31%
Huntington
20
1
100 ft
70%
Islip
23
17
13 ft
61%
Riverhead
7
4
25 ft
38%
Shelter Island
2
0
30 ft
39%
Smithtown
8
1
83 ft
51%
Southampton
20
8
26 ft
30%
Southold
10
8
20 ft
49%
Counts and medians of the areas we cover in each town, measured over developed land. An
area spanning two towns is counted under the first. Your own street can differ — each
area page has its own figures. Sources and limits.
What the basement flooding job actually involves
So you know what you are agreeing to, and can tell a thorough quote from a cheap one.
Extract standing water and make the area electrically safe.
Establish source — groundwater seepage, surface flooding, or a plumbing failure. The repairs are entirely different.
Remove porous material that has wicked water.
Dry to a measured moisture content, then advise on grading, drainage or a pump.
Know which trade you are buying. Extraction, drying and sanitation are restoration work. A failed pump, a cracked line or regrading the ground outside are separate trades, and a specialist who quotes all of it at once is quoting more than one job.
What makes it worse
Sealing the interior wall without addressing the water outside it.
Replacing flooring before the slab and framing are dry.
Ignoring downspouts and grading, which are usually the cheapest fix available.
Assuming a flood policy covers it — groundwater seepage generally is not covered by either standard homeowners or NFIP.
Rules and programs worth knowing in Suffolk County
What flood insurance actually covers in a basement
If you carry NFIP flood insurance, a basement — any floor below ground on all sides, finished or not — is covered only for a limited list: building essentials such as the furnace, water heater, electrical panel and sump pump, and, with contents coverage, a few items such as a washer, dryer and freezer.
Finished walls and flooring, furniture and most belongings in a basement are not covered, and flood coverage applies only when there is general surface flooding in the area. Worth knowing before deciding what to store down there.
The same basement can need very different cleanups depending on the water. The industry standard, ANSI/IICRC S500, lists rising water from rivers or streams and all flooding from seawater as Category 3, the grossly contaminated category, so surface flooding from a creek or bay is handled as contaminated even when it looks clear.
Groundwater that seeped through the foundation is not automatically in that category; it is decided on inspection. Tell the specialist where you think the water came in, because that is where the category decision starts.
This is the gap that catches people out. Groundwater seeping into a basement is generally excluded from a standard homeowners policy, and NFIP responds to surface flooding rather than seepage. A sudden plumbing failure is a different matter and usually is covered.
General guidance, not advice on your policy — coverage varies by insurer and endorsement, and
the wording is what decides it. Read yours, or ask your agent, before you need to.
Signs you need basement flooding help now
Water seeping through your floor drain or walls
Visible standing water on the basement floor
A strong musty or sewage smell
Damp walls or white mineral deposits (efflorescence)
Sump pump running constantly or failing
What to do before help arrives
Worth doing whether or not you call us.
Cut power to the basement at the breaker before stepping into standing water.
Photograph everything before you move it — insurers ask, and the water line matters.
Lift what you can off the floor; cardboard and particle board are usually lost by the time water is visible.
Do not run a household vacuum on standing water.
Find the source: rain-linked seepage at the floor-wall joint is a different repair from a burst supply line.
How to keep it from happening again
Extend downspouts so roof water lands well away from the foundation.
Check that the ground slopes away from the house on every side.
Clear window wells and fit covers.
Test the sump pump before the wet season, and consider a battery backup.
Store belongings off the floor in sealed plastic bins.
Have cracks at the floor-wall joint looked at while they are still dry.
Basement Flooding: common questions
Should I pump the water out myself?
If the water is shallow, came from inside the house, and nothing electrical is in it, removing it quickly limits the damage. Stay out if outlets, the panel or appliances are under water, or if it smells of sewage. When the ground outside is still saturated, pumping a basement dry all at once can put pressure on the walls, so a specialist may lower it in stages.
Will a dehumidifier dry it out?
It helps with damp air, but on its own it cannot dry soaked drywall, carpet pad or the bottom of the framing. Those need the water removed, air moving, and a moisture meter to confirm they are dry rather than a guess from how they feel.
Why does my basement leak after a wet spell even when it is not raining?
Often because the water is coming from the ground rather than the sky. Where the water table sits close to the floor and rises after a wet season, water can push in through joints and cracks in the foundation on a dry day as easily as a wet one. Each area page gives its measured water table depth, and the table above shows how it varies by town.
What are the usual permanent fixes?
It depends on where the water comes in. Surface water running toward the house is usually fixed outside, with gutters, downspout extensions and regrading so the ground slopes away. Groundwater coming through the floor or wall joints is usually handled with an interior perimeter drain feeding a sump pump, or from outside with a waterproofing membrane on the dug-out foundation wall, which is far more disruptive. Ask which source the specialist found before you compare quotes.
Water is coming up through the basement floor. Why?
Groundwater. When the water table rises to the level of the floor slab, pressure pushes water through cracks and through the joint where the floor meets the wall. It often appears a day or two after heavy rain and can continue after the rain stops. Pumping removes it only until the ground drains, which is why a sump pump or drainage is the usual lasting answer.
Water is coming up through the basement floor drain. Is that flooding or sewage?
Treat it as sewage until you know otherwise. A floor drain connects to the house drain line, so water rising from it usually means that line, or the sewer or cesspool beyond it, is blocked or full. Stop running water in the house. Clear water during a storm can be groundwater in some older homes, but that is for a specialist to judge on site.
Who do I call for a flooded basement?
A water damage specialist for the water and the drying. If the cause is a failed pump or a burst pipe, a plumber as well. If the water has reached the electrical panel or outlets, do not walk into it: the utility or an electrician comes first. Where the water is still rising from the street, nothing can be pumped until it goes down.
What decides the cost of a flooded basement cleanup?
Three things: how much area got wet, whether the basement is finished, and what kind of water it was. Clean water on bare concrete is pumping and drying. A finished basement means removing wet carpet, drywall and insulation. Sewage or floodwater from outside means more has to be thrown away. Time matters too, because material that could be dried on the first day often has to be removed by the third. We do not quote prices; the specialist who sees the job does.
Local conditions change what causes this and how it behaves, so each area where the
drivers behind basement flooding are actually present gets its own page with that
area's measured data. 140 of the 155 areas we cover
qualify; 43 of those pages are published so far and the rest are being added.