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Queens · Basement backups

Sewer backups & basement flooding in Queens

Queens basements flood in two ways: your own line blocks, or the city system fills in heavy rain. In parts of southeast Queens the second has been a long-running problem. Here's how to tell which you have and what helps.

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Call about a basement backup1-888-503-1510

Takes about a minute. Tell us what's happening, what kind of building it is, and the town or neighborhood.

Water in the basement right now?

Stop using water upstairs, stay away from any water near outlets or the electrical panel, keep people away from sewage, and photograph the damage. If neighbors are flooding too, report it to 311.

01Sewer backups & basement flooding in Queens: at a glance

Two different causes
A blockage in your building sewer (any weather) or a full city sewer during intense rain
Where it's most common
Low-lying parts of southeast Queens (Jamaica, St. Albans, Hollis, Springfield Gardens, Cambria Heights) and coastal areas (Howard Beach, Rockaway, Broad Channel)
City action
NYC has invested $1.9 billion in a southeast Queens drainage buildout, with dozens of projects over a decade
Who to call
Plumber for your line and backwater protection; 311 for street flooding or a suspected main problem
Insurance
Sewer backup is often excluded unless you have an endorsement; check your policy

New to this topic? The general guide covers the basics: sewer backups & basement flooding.

02What's different in Queens

In much of Queens, especially southeast Queens, a heavy downpour can overload storm drainage that was never built out to the standard of other boroughs. The result is backups through basement floor drains even when your own pipe is clear. The city's drainage buildout is reducing this block by block, but it isn't finished everywhere.

That's why the first question a plumber asks is when it backs up. Backups during dry weather point to your line. Backups only during intense rain, at the same time as neighbors, point to the city system, and the fix on your side is protection rather than repair.

03Typical situations

What the pattern tells youNeighborhoods and building types are examples. Every property is different.
PatternLikely causeWhat helps
Backs up in dry weather, when water is used upstairsClog or defect in your building sewerCleaning, camera inspection, repair
Backs up only in heavy rain, neighbors tooCity sewer surchargeReport to 311; backwater valve on your line (if suitable and maintained); keep valuables off the floor
Water seeps through walls or floor after rain, clearGroundwater, not sewerSump pump, grading, waterproofing
Backups got worse after nearby constructionDamage or debris in the lineCamera inspection, then repair

04How the job usually goes in Queens

  1. Ask when backups happen and whether neighbors are affected
  2. Clear and camera the building sewer to rule out a blockage or defect
  3. If the line is sound and backups are rain-driven, assess whether a backwater valve suits the building's drain layout
  4. Install with the required DOB filing by a Licensed Master Plumber, with an accessible cleanout for maintenance
  5. Explain how to use the house while the valve is closed during a storm, and how often to service it

05Permits, licenses & who to contact

  • Backwater valves and sewer repairs: NYC Licensed Master Plumber with DOB filings as required
  • Street flooding, catch basins, the city main: NYC DEP via 311
  • NYC DEP has studied backwater valves under Local Law 1 of 2023 and notes they "can work, but have significant drawbacks"

06What affects the price in Queens

  • Whether the line needs cleaning only, or repair as well
  • Whether a backwater valve can go in an existing cleanout or needs excavation
  • Basement floor and finish restoration
  • Number of basement fixtures and drains to protect

Prices are set by the plumber. Ask for the price, or how it will be calculated, before work starts.

07Before you call

Having this ready makes the first call faster:

  • Dates of past backups and the weather on those days
  • Whether neighbors flooded at the same time
  • Photos of where the water came from
  • Whether there is a basement apartment
  • Your insurance policy's sewer backup coverage

08Queens: frequently asked questions

Will a backwater valve stop my Queens basement from flooding?

It can stop sewage from coming back up the building sewer if it suits your drain layout and is maintained. It won't stop groundwater seepage, and while it's closed in a storm you shouldn't use water in the building.

Can I get the city to pay for flood damage?

Claims against the city for rain-driven sewer backups are generally hard to win; after Hurricane Ida the comptroller denied thousands of such claims. Focus on insurance and protection.

Is a basement apartment safe during flash floods?

Basement units are the most exposed. Know your exit route, keep valuables off the floor, and follow flash-flood warnings.

Sources & review

Last reviewed . General information, not legal or engineering advice. Rules change and individual buildings differ.

  1. NYC DEP, Southeast Queens $1.9 billion drainage program (2019)
  2. NYC DEP, Sewer Backup report (Local Law 1 of 2023)
  3. City Limits, sewer backup complaints (Mayor's Management Report)
  4. NYC Department of Buildings, Plumbing Permits