Sewage Coming Up? Stop Using Water First
Emergency Sewer Backup Help in NYC
When sewage rises through a basement floor drain, a shower, or the lowest toilet, the blockage is usually in the main line — and every flush upstairs makes it worse.
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Sewage is backing up into my basement — what do I do right now?
Stop using all water in the building — no flushing, showers, laundry, or dishwasher — and keep people and pets away from the sewage. If neighbors on your block are backing up too, report it to 311; NYC DEP says it inspects within six hours of a 311 complaint. Then call us to clear the line if the blockage is on your side.
At a Glance
- Service
- Emergency help for sewer and main line backups
- Provided by
- Urgent Plumber NYC
- Where
- All five NYC boroughs — Queens, Brooklyn, Manhattan, the Bronx, and Staten Island
- When
- 24 hours a day, 7 days a week, including holidays
Last updated
A sewer backup is different from a clogged sink. When sewage comes up through a basement floor drain, a shower, or the lowest toilet in the building, the blockage is almost always in the main drain line or the sewer service line that runs to the street — the one pipe everything else in the building drains into. Every flush, shower, and load of laundry upstairs adds to what's coming up.
In New York City, that service line is the property owner's responsibility all the way to the city sewer, while NYC DEP maintains the sewer main under the street. Knowing which side the problem is on decides who fixes it — and whether you should be calling 311 as well as a plumber.
If Sewage Is Coming Up Right Now
- Stop all water use in the building: no flushing, no showers, no laundry, no dishwasher. In a two-family house or apartment building, tell every household on the line.
- Keep children and pets away. Sewage carries bacteria — don't touch it with bare hands or walk through it in regular shoes.
- If the water is near outlets, a panel, the boiler, or the water heater, stay out of the area until the power to it is off.
- Check with neighbors. If several homes on the block are backing up at once, report it to 311 — the city sewer may be blocked or overwhelmed.
- Call and tell us where it's coming up (floor drain, toilet, shower), whether it's still rising, and whether you know where the building's cleanout is.
What Not To Do During a Sewer Backup
- Don't keep flushing to "push it through." A backup means the line can't take any more water.
- Don't pour chemical drain cleaner into the floor drain or toilet. It won't clear a main line, and it makes the water dangerous for whoever opens the line.
- Don't open the main cleanout yourself while sewage is backed up behind it — everything in the line can come out at once.
- Don't use a household vacuum on sewage, and don't leave soaked carpet, cardboard, or drywall sitting — it needs to be cleaned and disinfected or removed.
Your Line or the City's?
NYC DEP maintains the public sewer system — the mains under the street and the catch basins. The sewer service line (opens in a new tab) that runs from your building to the main belongs to the property owner, who is responsible for maintaining and repairing it. Most basement backups start on the private side: grease, wipes, tree roots, or a cracked or sagging section of old pipe.
A few clues point to the city side: several buildings on the block backing up at the same time, or backups across the neighborhood during heavy rain. Report those to 311 right away. DEP says it inspects within six hours of a 311 complaint (heavy rain or snowmelt can delay that), repairs the problem if it's in the city's system, and sends the owner a Notice to Repair if it's in the private line.
A camera inspection of the line shows where the blockage is and what's causing it, which settles the question either way.
Early Signs the Main Line Is Blocking
Gurgling from the lowest drains
Toilets or floor drains on the lowest floor gurgle when water runs upstairs — air is being pushed back past a partial blockage.
Water at the floor drain during laundry
A washing machine empties a lot of water fast. If the basement floor drain backs up during the drain cycle, the main line is struggling.
Several fixtures slow at once
When the tub, sinks, and toilet all slow down together, the problem is downstream of all of them: the main line.
A sewer smell in the basement
A persistent odor near the floor drain or cleanout can mean a partial blockage or a dried-out drain trap — worth checking before it turns into a backup.
What Causes Sewer Backups in NYC
Grease, wipes, and debris
Cooking grease hardens inside the line, and "flushable" wipes don't break down. Together they build a blockage that catches everything else. NYC DEP's advice is simple: trash it, don't flush it.
Tree roots
Roots work into joints and cracks in older clay and cast-iron service lines, especially on tree-lined blocks of houses in Queens, Brooklyn, and Staten Island.
Old, sagging, or broken pipe
A service line that has cracked, sagged, or partly collapsed holds water and debris, so the clogs keep coming back until that section is repaired.
Heavy rain
When a storm overwhelms the sewer system, water can push back up into the lowest drains of buildings across a neighborhood. If it's happening on your block, report it to 311.
How a Sewer Backup Gets Handled
Find where it's coming up
Which drains are backing up, and on which floor, shows how far down the line the blockage is.
Clear the line
The main line is cleared from the cleanout with a drain cable — or with hydro jetting for grease and buildup.
Check whether it will come back
A backup that returns quickly usually means roots, a break, or a sag in the line rather than a simple clog — a camera inspection of the line is the standard way to confirm which.
Explain the options
If the line needs more than clearing, you'll get a straight explanation of what was found and what the options are.
Houses, Apartment Buildings, and Storms
In a one- or two-family house — the norm across most of Queens and Staten Island — the basement floor drain is usually the lowest opening, so it's where a main line backup shows up first, often right next to the boiler and water heater.
In an apartment building, a backup usually starts in a shared stack or the building's main line, and the lowest apartments see it first. Tell the super right away: the fix is in the building's line, not in one apartment. Commercial and multi-unit properties often need the building engineer or manager involved for access.
Some houses have a backwater valve on the main line to stop sewage from flowing back in during storms. If yours does, it only protects you if it's kept clear and able to close — worth having checked if your basement has backed up before.
What Affects the Cost of a Sewer Backup Call
- Where the blockage is
- A clog near the cleanout clears faster than one deep in the service line under the yard or sidewalk.
- Access to a cleanout
- A reachable cleanout makes the line quick to open. No cleanout, or one buried behind finished walls, means pulling a toilet or opening the line elsewhere.
- What caused it
- Grease clears with cabling or jetting. Roots or a broken section may need a camera inspection and a repair, not just clearing.
- Cleanup afterward
- Sanitizing floors and removing soaked materials after a backup is usually separate from clearing the line.
After a Backup: Cleanup and Claims
Water that came up a drain may contain sewage. NYC DEP's guidance is to clean and disinfect affected indoor areas thoroughly. Porous materials — carpet, insulation, soaked drywall — often can't be saved, and large backups are a job for a cleanup company.
Take photos before cleanup, keep your 311 tracking number if you reported it, and call your insurer early — sewer backup coverage is often a separate add-on to a homeowner's policy. If you believe the City's sewer caused the damage, DEP notes that claims go to the NYC Comptroller's Office within 90 days. This is general information, not legal or insurance advice.
Frequently Asked Questions
Stop using all water in the building, keep children and pets away, avoid touching the sewage, and call right away. If neighbors are backing up too, report it to 311 as well.
NYC DEP maintains the sewer main in the street; the property owner is responsible for the sewer service line from the building to the main. If you think the city main is the cause, report it to 311. A camera inspection can show which side the blockage is on. This is general information, not legal advice.
NYC DEP says it inspects within six hours of a 311 complaint, though heavy rain or large snowmelts can delay inspections. Keep your 311 tracking number.
A washing machine empties a lot of water quickly. If the main line is partly blocked, that surge has nowhere to go and comes up at the lowest opening — usually the basement floor drain. It's an early warning worth acting on.
Small amounts can be cleaned with gloves, boots, and disinfectant once the line is clear. Keep children and pets away, and don't use a household vacuum. Soaked carpet, insulation, and drywall usually need to be removed, and large backups are a job for a cleanup company.
Often only if the policy includes a sewer or water backup add-on. Check your policy and call your insurer early — photos taken before cleanup help. This is general information, not insurance advice.
Yes. When storms overwhelm the sewer system, water can push back up into the lowest drains of buildings across a neighborhood. If it's happening on your block, report it to 311. A backwater valve, where one is installed and maintained, is designed to stop that backflow.
Official Sources
Sewage backing up right now?
Stop using water, keep clear of it, and call — any hour, in any borough.
Copy the number and the message template above to text us from your phone.