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NYC 311 Complaint Decoder: Street Flooding and Clogged Catch Basins — How to Report and What the City’s $108 Million Fix Means for Your Block

Every summer rainstorm, the same thing happens across New York City: streets flood within minutes, water backs up onto sidewalks, and frustrated New Yorkers wade through ankle-deep puddles wondering if anyone is doing anything about it. The answer is yes — but only if you report it, and only if you know which type of complaint to file.

This week’s 311 Complaint Decoder focuses on one of summer’s most underreported 311 issues: clogged catch basins and street flooding. With the city now investing $108 million to overhaul the drainage system — and new data showing complaint response times have dropped to three days — this is exactly the moment to understand how your 311 report gets results.

What Is a Catch Basin (and Why Does It Matter)?

Catch basins — also called storm drains or sewer grates — are the curbside metal grates you see on nearly every NYC block. They channel stormwater from the street into the city’s underground sewer network, which spans 7,500 miles and includes more than 150,000 catch basins citywide, all managed by the NYC Department of Environmental Protection (DEP).

When a catch basin is blocked by leaves, litter, or plastic bags, rainwater has nowhere to go. The result is the street flooding that has become an increasingly common feature of NYC summers as climate change brings more intense storm events. Research published in the Journal of Hydrology found that catch basin complaints are significant predictors of street flooding complaints in nearly half of NYC zip codes. Your 311 call is data that helps the city prioritize where to deploy its cleaning trucks.

The City’s $108 Million Investment — What It Means for Your Neighborhood

In March 2026, Mayor Zohran Kwame Mamdani and DEP Commissioner Lisa F. Garcia announced a $108 million investment to replace more than 6,700 aging catch basins over the next decade. This is not a press-release promise — full replacement work begins this July in Queens, where flooding complaints have historically been among the highest in the city.

The announcement also confirmed:

  • $1.5 million annually to modernize existing basins with improved grates and slotted manhole covers. Since July 2024, DEP has already upgraded 3,273 catch basins citywide.
  • 40 new specialized cleaning trucks (a separate $20 million purchase), nine of which are already deployed. DEP plans to fully replace its 47-truck fleet by June 2029.
  • Bike-friendly catch basin grate redesigns that reduce the hazard to cyclists while improving drainage.
  • Slotted manhole covers on sidewalks that provide a backup drainage path when street grates are blocked.

As of 2026, DEP is resolving catch basin and street flooding complaints within three days of a 311 request — well ahead of the legally mandated eight business days. That improvement is driven partly by resident reporting.

How to File the Right 311 Complaint

There are three types of complaints to know:

1. Catch Basin Complaint

Use this if you see a grate that is blocked by debris, missing its cover, or structurally damaged. This routes to DEP for cleaning or repair.

  • Online: portal.311.nyc.gov — Catch Basin Complaint
  • Phone: Call 311 (24/7) and say “catch basin complaint”
  • What you’ll need: The nearest cross street and borough. If the grate is missing or broken, note that specifically — it escalates priority.

2. Street Flooding / Water Drainage Complaint

Use this if water is pooling on a street or sidewalk after rain and not clearing. Also routes to DEP.

3. Sewer Backup (Emergency)

If water is backing up through drains inside your building or into your basement, call DEP directly at 718-DEP-HELP (718-337-4357), available 24/7. Or report at nyc.gov/dep — Sewer Backup.

Which Neighborhoods Are Most Affected?

Street flooding complaints cluster in neighborhoods with older sewer infrastructure, high impervious surface coverage, and low-lying geography. Historically affected areas include:

  • Southeast Queens (Jamaica, Springfield Gardens, Hollis) — routinely among the city’s highest flooding complaint areas, which is why DEP is starting $108M replacement work in Queens this July
  • Canarsie and East Flatbush, Brooklyn — low-lying areas with aging combined sewer systems
  • Hunts Point and Soundview, the Bronx — Environmental Justice communities that experience disproportionate flooding impacts
  • Sunset Park, Brooklyn — specifically cited in the March 2026 investment announcement as a priority Environmental Justice area

Even if your neighborhood isn’t listed: any blocked catch basin anywhere is worth reporting. DEP’s data-driven inspection program uses complaint volume to prioritize proactive cleaning routes.

What You Can Do Right Now

You don’t have to wait for a flood. If you see a catch basin grate blocked by leaves or debris:

  1. You can carefully remove surface-level debris (leaves, plastic bags) from the top of the grate yourself — the city encourages this
  2. File a 311 complaint regardless, so DEP can inspect the underground basin for deeper blockages
  3. Take a photo when you report online — it helps DEP assess urgency
  4. Track your complaint status at portal.311.nyc.gov using your service request number

Pro tip: If you see the same spot flood repeatedly after every rain, file a new 311 complaint each time. Repeat complaints at the same location signal a chronic infrastructure problem, which increases the likelihood of a full replacement rather than a spot cleaning.

How to Take Action

Who This Helps

This guide is for any New Yorker who has watched their street turn into a river after a summer storm — homeowners worried about basement backups, parents navigating flooded sidewalks with strollers, cyclists who have had tires caught in damaged grates, and anyone in a low-lying neighborhood who wants to know their 311 report actually goes somewhere. It does. File it.

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