Water pools in our lot after every rain. Where do we start?

Start by marking where it stands relative to the nearest inlet. Pooling at or beside a catch basin points at the structure: a settled rim, a damaged frame, or a blocked or collapsed pipe. Pooling in a low spot with no inlet nearby is a grading problem, and no amount of work on the basin will move it. That single observation decides which trade you should be getting a bid from.

Can a contractor tell what is wrong without opening anything?

Not reliably. Diagnosing a structure means lifting the grate, inspecting the frame and brickwork, and putting a camera down the outgoing pipe. Diagnosing a grading problem means shooting elevations across the area and mapping where the surface actually falls. A bid built on neither of those is a guess, and it usually arrives as a quoted count of basins rather than a diagnosis.

Does drainage work need municipal approval?

It does wherever it touches the municipality's system. Rebuilding a structure inside your own lot is private site work, but a new connection to the storm sewer, or a change to how much water leaves the site and where it leaves, needs municipal approval and can trigger a stormwater review. Confirm which bidder is applying for that approval before you compare prices, because it changes the scope.

Should drainage be fixed before the lot is resurfaced?

Yes, in almost every case. Standing water is what turns freeze-thaw into base failure, so a new surface laid over a lot that ponds will fail first in exactly the ponded areas. If both are in the same program, ask the contractor to state the sequence in writing and to explain how the corrected grades tie into the new surface, rather than treating the two as separate jobs that happen to share a site.

Catch Basin Repair vs Regrading: Fixing Water That Stands on a Lot

Last updated: August 4, 2026By The Pavement Desk

Find out where the water is standing relative to the nearest structure before approving anything. Pooling at a basin points to the rim, the frame or the pipe. Pooling in the middle of a bay points at the grades. Rebuilding a sound basin because a lot ponds thirty metres away is money spent with no change on the ground.

Once the approach is settled, AsphaltPavingIndex's own dataset lists 7 site drainage contractors across the Greater Toronto Area at an average Google rating of 4.98★ over 41 reviews (August 2026), so you can move straight from this page to a ranked shortlist for the bid list.

This page compares the two approaches on scope, evidence and disruption. Rates live in the linked cost guides, where every figure carries the named source it came from.

Catch basin repair or Regrading: what actually separates the two on a lot?

AsphaltPavingIndex built this side-by-side around the things that decide the choice on a working site: what each approach does, what it leaves untouched, and what the bid has to show before two prices can be compared at all.

Catch basin repair vs Regrading on a Greater Toronto Area commercial site, reviewed August 2026. Rates are on the linked cost guides, quoted before 13% HST.
Criterion	Catch basin repair	Regrading
What the symptom looks like	Water pools around or beside a structure, or drains away far too slowly	Water pools in a low spot with no structure near it
Usual cause	Settled or broken frame and rim, damaged brickwork, or a blocked or collapsed pipe	The surface was never graded to fall toward an inlet, or it has settled since
How it is diagnosed	Lift the grate, inspect the structure, and camera the outgoing pipe	Shoot elevations across the area and map where the surface actually falls
Scope of the work	Rebuild the structure and reset the frame to grade, replace pipe where needed	Mill or excavate the area, re-establish fall toward an inlet, and repave
Area affected	Local, around the structure	Wide, since a grade change has to tie into the surrounding surface
Municipal approval	Needed where work touches the municipal storm sewer connection	Needed where the change alters how much water leaves the site, or where it leaves
If it is ignored	Water backs up and saturates the base around the structure until the surface fails there	The ponded area is the first part of the lot to fail through freeze-thaw
What the bid must show	Price per structure, what it covers, and what happens if the pipe is found collapsed	Proposed finished grades, whether they are surveyed, and how the new area ties into the existing surface

Which surfaces call for catch basin repair?

Repair the structure when the water is standing at or beside it. A settled rim, a cracked frame, damaged brickwork or a blocked outgoing pipe all produce exactly that picture, and none of them is visible until the grate comes off and a camera goes down the line.

Water pools within a few metres of a basin, or drains away far too slowly.
The grate or frame sits below or above the surrounding surface.
The area around the structure has already started to fail.

And which call for regrading?

Regrade when the low spot is nowhere near a structure. That is a surface that does not fall toward an inlet, whether it was built that way or has settled since, and the only fix is to change the shape of the surface so the water has somewhere to go.

Ponding sits in the middle of a bay or aisle with no inlet nearby.
Elevations confirm the surface falls the wrong way or is flat.
The area is already scheduled for resurfacing, so the grade correction can be built into that scope.

How does the choice play out on a working site?

After rain, walk the lot and mark every place water is still standing. Where each mark sits tells you which bid you should be asking for:

Reading the site

Standing at a basin: Inspect the structure and pipe
Standing mid-bay, no inlet nearby: Shoot elevations, regrade
Grate sits proud of the surface: Reset the frame to grade
Whole run drains slowly: Camera the pipe
Ponding plus cracking in the same spot: Drainage first, surfacing after

That last line is the one that gets sequenced wrong most often. Resurfacing over a lot that ponds puts a new surface on the same standing water, and the repaired area fails first. Fix the drainage, then program the surfacing, and ask any bidder proposing both to state the order and why.

Frequently asked questions

Water pools in our lot after every rain. Where do we start?: Start by marking where it stands relative to the nearest inlet. Pooling at or beside a catch basin points at the structure: a settled rim, a damaged frame, or a blocked or collapsed pipe. Pooling in a low spot with no inlet nearby is a grading problem, and no amount of work on the basin will move it. That single observation decides which trade you should be getting a bid from.
Can a contractor tell what is wrong without opening anything?: Not reliably. Diagnosing a structure means lifting the grate, inspecting the frame and brickwork, and putting a camera down the outgoing pipe. Diagnosing a grading problem means shooting elevations across the area and mapping where the surface actually falls. A bid built on neither of those is a guess, and it usually arrives as a quoted count of basins rather than a diagnosis.
Does drainage work need municipal approval?: It does wherever it touches the municipality's system. Rebuilding a structure inside your own lot is private site work, but a new connection to the storm sewer, or a change to how much water leaves the site and where it leaves, needs municipal approval and can trigger a stormwater review. Confirm which bidder is applying for that approval before you compare prices, because it changes the scope.
Should drainage be fixed before the lot is resurfaced?: Yes, in almost every case. Standing water is what turns freeze-thaw into base failure, so a new surface laid over a lot that ponds will fail first in exactly the ponded areas. If both are in the same program, ask the contractor to state the sequence in writing and to explain how the corrected grades tie into the new surface, rather than treating the two as separate jobs that happen to share a site.

Questions to ask your contractor

What is the price per structure, and what does it cover? Per-structure benchmarks
Is the ponding a structure problem or a grading problem, and what is the evidence?
Does any of this connect to the municipal storm sewer, and who obtains approval?
What happens to the price if the existing pipe is found collapsed?
How is surface water handled while the structure is open?