Storm Drain Contractors in NYC

What Is a Storm Drain System and How Does It Work?

A storm drain system collects rainwater from your roof, yard, and driveway, carrying it away from your property through underground pipes to the municipal storm sewer or a dry well.

What Is a Storm Drain System and How Does It Work?

A storm drain system collects rainwater from your roof, yard, and driveway through catch basins and underground pipes, carrying it away from your property to the municipal storm sewer or a dry well. We install and maintain these systems across all 5 NYC boroughs. The system starts at roof gutters that feed downspouts, which connect to underground pipes running to a catch basin or directly to the street sewer. In older NYC neighborhoods — particularly pre-1960s Brooklyn and parts of the Lower East Side — these storm drains often connect to a combined sewer that carries both stormwater and sanitary sewage in the same pipe. A properly functioning storm drain prevents basement flooding and foundation damage — the single most expensive repair for NYC homeowners after a heavy rain.

What Is a Catch Basin and How Does It Work?

A catch basin is a concrete or polymer box with a cast iron grate at the top that collects surface water from streets, yards, and driveways. Sediment and debris settle in the sump at the bottom while cleaner water flows through the outlet pipe into the storm drain system. The grate catches large debris — leaves, trash, gravel — while the sump traps finer sediment that would otherwise clog the underground pipes. NYC standard catch basins are 24″x24″ or 30″x30″, and the sump needs cleaning every 6-12 months — a neglected sump is the #1 cause of street flooding around the basin.

Common Storm Drain Components in NYC Homes

• Catch basin: Concrete or polymer box with a grate; collects surface water and traps sediment in the sump before water enters the pipe system.
• Downspout: Vertical pipe from roof gutters that channels rainwater into the underground storm drain system; often connects via a boot fitting at ground level.
• Cleanout: A capped access point — typically a 4″ pipe rising to ground level — that allows camera inspection and hydro-jetting equipment to enter the system.
• Underground pipe: PVC (SDR-35 or Schedule 40), clay tile, or cast iron pipe that carries water from catch basins to the municipal storm sewer or dry well.
• Dry well: An underground pit filled with gravel that collects and infiltrates stormwater into the surrounding soil; common where municipal storm sewer connection isn’t available.

What is the difference between a storm drain and a sanitary sewer?

Storm drains carry untreated rainwater to local waterways, while sanitary sewers carry wastewater to treatment plants — and in older NYC neighborhoods, the two share a single pipe.

Storm drain vs sanitary sewer: key differences

How to tell if you have a combined or separate system

NYC homes built before the 1960s in older neighborhoods — parts of Brooklyn, Manhattan, and the Bronx — likely have a combined sewer system where stormwater and sanitary wastewater share one pipe. Newer developments and post-1960s construction have separate systems, with storm drains running to local waterways and sanitary lines heading to treatment plants. A dye test — flushing colored dye down a cleanout and watching where it exits — is the definitive 15-minute diagnostic to confirm whether your line is storm or sanitary. In our field work, we’ve seen homeowners in Brooklyn brownstones mistake a clogged sanitary line for a storm drain issue, so that quick test saves everyone a lot of digging.

How do I know if my storm drain is clogged?

Watch for standing water in your yard after rain, gurgling from basement drains, and slow-draining downspouts — these are the most common signs that your storm drain system has a blockage.

7 signs your storm drain is clogged

• Standing water in the yard: Water pools around the catch basin or in low spots for more than 24 hours after a moderate rain — this points to a main-line blockage beyond the sump.
• Gurgling from basement drains: Air bubbles or gurgling sounds from floor drains or cleanouts during a rainstorm signal a partial obstruction in the pipe.
• Slow-draining downspouts: Water backs up in gutters or overflows from downspouts, indicating the underground pipe is blocked between the downspout connection and the main line.
• Basement water intrusion: Water seeps through basement walls or the slab after rain — a clogged storm drain forces water against the foundation.
• Foul odors from drains: Stagnant water in a clogged pipe produces a musty or sewage-like smell, especially in combined sewer areas of Brooklyn and the Bronx.
• Visible debris in the catch basin: Leaves, sediment, or trash packed in the basin sump means cleaning is overdue — and a full sump is the first step toward a pipe blockage.
• Video inspection confirmation: We insert a camera from the cleanout to locate the exact blockage — root intrusion, sediment dams, or collapsed pipe — and plan the right cleaning method.

If standing water in your yard doesn’t drain within 24 hours after rain, the clog is likely in the main pipe rather than just the catch basin sump — this requires hydro-jetting or mechanical cleaning.

When to call a professional vs DIY

You can clear minor catch basin sediment yourself by scooping out debris, but if water pools in your yard after every moderate rain or you hear gurgling from basement drains, a professional video inspection is needed. That camera run — inserted from the cleanout — shows us whether the blockage is soft sediment, root intrusion, or a collapsed section before we decide on the tool. DIY drain snakes rarely reach the main line blockage in storm drains — the pipe diameter (4″ minimum) and distance from cleanout to street (often 50–100 ft) require commercial-grade equipment.

What causes storm drain backups?

Storm drain backups in NYC have a handful of recurring causes, from simple debris buildup to aging pipe systems that fail under pressure. Knowing the root cause determines whether a cleanout or a full replacement is needed.

Top causes of storm drain backups in NYC

• Debris and sediment buildup: Leaves, gravel, and trash accumulate in catch basins and pipes over months, gradually reducing flow capacity until water has nowhere to go.
• Root intrusion at pipe joints: Tree roots enter through loose joints in clay tile and older PVC pipes, growing inside the line and creating dense blockages. In Brooklyn brownstones with mature street trees, root intrusion is the #1 cause — and hydro-jetting alone won’t prevent regrowth without root-killing foam treatment.
• Pipe collapse or cracking: Pre-1970 cast iron and clay pipes crack or collapse due to ground movement, heavy street traffic, or decades of internal corrosion, creating a physical blockage.
• Improper grading around catch basins: If the ground slopes away from the catch basin instead of toward it, water never enters the system; sediment settles in the pipe and eventually causes a backup.
• Frozen shallow pipes in winter: Storm drains buried less than 4 feet deep freeze during NYC winters, and ice blockages cause backups during the January thaw cycle.

Why NYC’s combined sewer system causes backups during heavy rain

In older NYC neighborhoods with combined sewer systems, heavy rain can overwhelm the shared pipe capacity, causing water to back up through basement floor drains and cleanouts. The combined sewer overflow (CSO) phenomenon happens when stormwater and sanitary sewage share one pipe — during a 1-inch-per-hour downpour, the system hits capacity and seeks the path of least resistance, which is often your basement. A backwater valve installed by a Licensed Master Plumber is the most effective protection against CSO-related basement flooding — it’s required in many NYC flood-prone areas and costs far less than a single cleanup.

What is hydro-jetting for storm drains?

Hydro-jetting uses high-pressure water to blast debris, sediment, and small roots from storm drain pipes — it’s the standard cleaning method for residential and commercial systems across NYC.

What is hydro-jetting and how does it clear storm drains?

Hydro-jetting uses a 3,000-4,000 PSI water jet with specialized nozzles to blast debris, sediment, and small roots from storm drain pipes without damaging the pipe walls. We always perform a video inspection before and after jetting to confirm the blockage is fully cleared. The truck-mounted unit carries 100-200 gallons of water and feeds a hose that advances through a cleanout or catch basin while the nozzle sprays. A forward-pulling nozzle pushes debris downstream to the municipal outlet, while a rear-facing nozzle cuts roots at pipe joints — using the wrong nozzle can push debris deeper into the pipe instead of flushing it out. For a hydro-jetting storm drain NYC service, we re-camera every job afterward to document the cleared line.

Hydro-jetting vs mechanical cleaning: which is better?

How often should you clean your storm drain?

Preventative hydro-jetting every 1-2 years keeps problem drains clear, while well-maintained systems need cleaning every 3-5 years. The frequency depends on tree coverage, soil type, and pipe material — clay tile pipes in older Brooklyn neighborhoods need more frequent attention than modern PVC. If you have mature trees near your property line, schedule annual cleaning — root intrusion accelerates in summer when roots seek moisture in the pipe joints.

Can you fix a broken storm drain pipe without digging?

Trenchless storm drain repair fixes damaged underground pipes without excavation, using methods like CIPP lining to create a new pipe inside the old one — but it only works when the pipe is structurally sound enough to hold the liner.

What is trenchless storm drain repair (CIPP lining)?

Trenchless storm drain repair NYC relies on Cured-in-Place Pipe (CIPP) lining — an epoxy-impregnated felt liner inserted into the damaged pipe, inflated with air or water pressure, and cured to form a smooth, jointless pipe-within-a-pipe. We complete most residential sections in 4-8 hours with no excavation. The process starts with a full video inspection and hydro-jetting to clean the pipe wall, then we measure the exact length and diameter — typically 20-40 feet of 4- to 6-inch storm drain on a Brooklyn rowhouse or Queens single-family. The epoxy liner cures at ambient temperature in 2-4 hours; hot water or steam accelerates it to under two hours. CIPP lining extends pipe life by 50+ years, but the pipe must be structurally sound enough to hold the liner — collapsed or severely offset pipes still require excavation.

When is excavation necessary?

• Complete pipe collapse: The pipe walls have caved in entirely — no liner can hold against that pressure, so the section must be dug out and replaced.
• Severe joint misalignment (offset): When two pipe sections shift more than 10-15% of the pipe diameter at the joint, a liner won’t seat properly and will buckle during inflation.
• Multiple failures in the same section: Three or more cracks, breaks, or root intrusions within a 10-foot span mean the structural integrity is too compromised for trenchless repair.
• No cleanout access points: If the pipe lacks a cleanout within 100 feet of the damaged area or at a direction change, the liner can’t be inserted — we’d need to excavate for access first.

Can you install a new storm drain system?

We install complete storm drain systems for NYC properties — from catch basins and downspout connections to the municipal tie-in, handling every stage from permit application through final inspection.

New storm drain installation: what’s included

• Site design and permitting: A Licensed Master Plumber stamps the drawings and submits them to NYC DOB for review — the permit process takes 1–2 weeks, and we never excavate before approval.
• Excavation and pipe laying: We dig 4–6 feet deep (below the frost line) and install SDR-35 or Schedule 40 PVC pipe at a minimum 4-inch diameter, with catch basins at every low point and cleanouts every 100 feet and at each direction change.
• Surface restoration: After backfill and compaction in 6-inch lifts, we restore concrete, asphalt, or topsoil — concrete restoration adds curing time before the surface is usable.
• Inspection and sign-off: An NYC DOB inspector verifies the slope (minimum ¼ inch per foot), connections, and cleanout placement before we close the permit.
• Warranty: All storm drain installation NYC work carries a 1-year warranty on workmanship; the PVC pipe itself has a 50–100 year manufacturer design life.

How long does storm drain installation take?

A typical residential storm drain installation takes 3–7 days from excavation to final inspection, depending on pipe length, soil conditions, and surface restoration requirements. Rocky soil or clay — common in Queens and Staten Island — can add 1–2 days to excavation, while concrete restoration adds curing time before the surface is usable.

Do I need a permit for storm drain work in NYC?

NYC requires permits from the Department of Buildings and DEP for any storm drain installation, modification, or connection to the municipal system — minor cleaning and spot repairs typically don’t need one.

When do you need a permit for storm drain work in NYC?

• DOB permit required: Any new storm drain installation, pipe replacement, or connection to the municipal system needs a NYC DOB permit submitted by a Licensed Master Plumber.
• DEP permit for municipal connection: Connecting to the municipal separate storm sewer system (MS4) requires a separate NYC DEP Stormwater Management permit under the Unified Stormwater Rule.
• Repairs that don’t need a permit: Catch basin cleaning, hydro-jetting, video inspection, and spot repairs of existing pipes using the same material and size typically proceed without a permit.
• Penalties for unpermitted work: Connecting a sump pump discharge to the storm drain without a DEP permit is illegal in NYC and can result in fines of $1,000–$10,000 plus a stop-work order.
• Storm drain permit NYC process: We handle the full permit application — plans go to DOB for 1–2 week review, DEP signs off on the MS4 connection, and a final inspection follows the work.

NYC DEP stormwater regulations you should know

NYC DEP’s Unified Stormwater Rule (2022) requires on-site stormwater retention for new developments over 20,000 sq ft, and any connection to the municipal storm sewer needs a DEP permit under the MS4 program. The rule governs how stormwater runoff is managed on private property, specifying retention volumes, infiltration rates, and overflow routing for new construction and major renovations. Properties in combined sewer areas — much of pre-1960s Brooklyn, Manhattan, and the Bronx — must also comply with DEP’s CSO Long Term Control Plan, which limits how much stormwater enters the shared pipe. Downspout disconnection from the combined sewer is required in many NYC areas — if done improperly, water pools against your foundation and causes basement leaks.

Conclusion: Keeping Your Storm Drain System Working

Main takeaways

Storm drain maintenance is essential for preventing basement flooding, foundation damage, and street flooding in NYC’s aging infrastructure. The catch basin — that concrete box with the cast iron grate in your yard or driveway — is the first line of defense. It traps leaves, gravel, and sediment in its sump before those materials reach the underground pipes. But that sump fills up over time. In the field, I see homeowners who ignore the catch basin for years, then call us after a heavy rain floods their basement. The fix is straightforward: regular catch basin cleaning every 6-12 months and video inspection every 1-2 years catch problems before they cause expensive damage — a $350 cleaning today prevents a $5,000 basement flood repair tomorrow.