Curb Trap Repair in Philadelphia, PA
The curb trap is the U-shaped fitting where your lateral meets the city main — usually under your sidewalk or the street. It belongs to you, not the city (PWD policy). When it clogs or fails, it's the most common choke point on an old Philly lateral. Camera first, then the least digging that actually fixes it.
What a curb trap is — and why it's your problem
A curb trap is a U-shaped fitting installed on your sewer lateral at (or near) the curb — usually sitting under the sidewalk or the street where your line joins the city main. Originally it blocked sewer gas from backing up into homes. Most Philadelphia rowhomes still run their original trap, installed when the house went up.
The U-shape makes it a natural catch point. Grease congeals in the bend, tree roots enter at the joints, and after decades of service the fitting itself corrodes, settles, or cracks. When a Philly lateral backs up and everything upstream is clean, the curb trap is where the camera usually finds the problem.
And here's the part homeowners fight: per Philadelphia Water Department policy, you own the lateral including the curb trap — even the part under public pavement. PWD maintains the city main; everything from the house to that main is on you. That's also why PWD Notices of Defect so often name the curb trap: the city found your fitting broken or leaking, and fixing it is your responsibility.
HIGHLIGHTED IN ORANGE: THE CURB TRAP — THE U-SHAPED FITTING AT THE CURB, UNDER THE SIDEWALK OR STREET.
Signs the curb trap is the choke point
Curb trap trouble has a signature — everything upstream looks fine.
House line is clean, still backs up
The lateral jets clean, the fixtures are fine, and the backups keep coming. The blockage is past your house line — at the trap.
Slow at every fixture, low floor first
Basement fixtures back up first because they're lowest. The trap restricts flow; the lowest drain shows it first.
PWD notice names the trap
A Notice of Defect calling out a broken or leaking curb trap means the city already found it. Camera next.
Camera stops at the curb
The camera travels the lateral and dies at the trap — a root mass, grease dam, or a collapsed fitting right at the bend.
Camera → locate → least digging that fixes it
Camera the trap
The camera runs to the curb and shows the trap's condition — clogged, root-packed, settled, or collapsed. You see the footage.
Locate from the surface
We mark exactly where the trap sits: under the sidewalk, under the street, depth, and what's above it.
Trenchless if possible
If the trap and surrounding pipe qualify, lining or bursting fixes it through the lateral — no street opening.
Permitted street opening
If it sits under pavement and trenchless can't do it, we open the street with permits, replace the trap, and restore. Priced in writing first.
What curb trap repair can and can't do
- Grease and roots are the usual suspects. The U-bend catches grease; joints at the trap invite roots. Jetting or cutting clears clogs — repair replaces failed fittings.
- Trenchless works when the run qualifies. If the trap and the pipe around it can be lined or burst from the lateral, you skip the street opening entirely.
- Under pavement means permits. A curb trap under the sidewalk or street needs a permitted street opening — handled by us, quoted in writing before you approve.
- Some traps get removed, not replaced. Modern practice often removes the trap function entirely rather than replacing like-for-like — we'll explain the option and the reasoning before you decide.
- It's part of the lateral you own. Any lateral replacement quote covers the full run to the city main — curb trap included — because PWD holds you responsible for all of it.
A collapsed trap deep under a busy street is sometimes the one job where open-cut is the only real answer. If that's your case, you hear it before you spend a dollar.
What curb trap repair costs in Philadelphia
The trap's location decides the method — and the method decides the price. In writing before you approve.
| Line item | Typical | Notes |
|---|---|---|
| Camera inspection + locate | [TBD] | Confirms the trap is the problem and marks its position |
| Curb trap cleaning (jetting/cutting) | [TBD] | When the trap is clogged but structurally sound |
| Trenchless curb trap repair | [TBD] | Lining or bursting through the lateral — no street opening |
| Open-cut trap replacement (street opening) | [TBD] | Permits + restoration included in the written quote |
Full cost breakdown by method: Trenchless Sewer Cost in Philadelphia, PA. The camera answers the only question that matters: trenchless or street opening? Everything else follows.
Related servicesStraight answers before you call
A U-shaped fitting on your sewer lateral, usually sitting under the sidewalk or street where your line meets the city main. It was originally installed to block sewer gas from backing up into homes. Many Philadelphia rowhomes still have their original one.
You do. Per Philadelphia Water Department policy, the homeowner owns the lateral including the curb trap — even the part under the public sidewalk or street. If it clogs or collapses, the repair is the homeowner's responsibility.
The U-shape is a natural catch point: grease congeals in it, roots from nearby trees enter at the joints, and after decades the fitting itself corrodes or settles. It's the single most common choke point on an old Philly lateral.
Sometimes. If the curb trap and surrounding pipe are reachable trenchless, lining or bursting can handle it. But if the trap sits under pavement and can't be fixed trenchless, it needs a street opening with permits. A camera inspection with a locate tells you which one you're facing.
Any work under the sidewalk or street needs permits — street openings aren't DIY territory. We handle the permitting, price it into the written quote, and never start until it's approved.
Don't panic — read our PWD Defect Notice guide first. Then get a camera inspection before you approve anything: you need to see what's actually wrong at the trap before deciding between trenchless and open-cut.
Curb trap repair across the Philly metro
Based in Philadelphia — curb traps are a rowhome fixture here — and running jobs across Delaware, Montgomery, Bucks, and Chester counties.
Suspect the curb trap? Let's look at it on camera.
Trenchless where possible, permitted street opening when it isn't. Written quote either way — before any digging.
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