Can I just wait and see if it happens again?

Yes, if the water is clean, in an unfinished space, and drains away. Note the date, the rainfall and where it appeared. Two or three of those notes are worth more to a contractor than anything you could tell them from memory.

The water only appears in very heavy rain. Does that mean the drain is fine?

No. It means the system copes until it does not, which is what a partly blocked drain looks like. It also looks exactly like a surface water problem that only shows up in a downpour. This is the case where a camera earns its keep.

Is a wet crawl space actually a problem if nothing is stored down there?

It is a problem for the house rather than for your storage: persistent damp moves into the floor structure and the air you breathe upstairs. It is rarely an emergency, and it is rarely nothing.

Water showed up in my basement or crawl space. Is the perimeter drain the problem, or is it something else?

Water in your basement or crawl space — before you assume it is the drains

Direct answer · reviewed 2026-09-22

Probably not the drains, at least not first. In Greater Victoria the same puddle is caused, in rough order of how often and how cheaply it is fixed, by: surface water running towards the house, a downspout discharging at the foundation or tied into the wrong pipe, a plugged or collapsed perimeter drain, hydrostatic pressure under the slab, or a plumbing leak that has nothing to do with rain. The order matters because the first two cost a weekend and the third costs thousands. What tells them apart is where the water appears, when it appears relative to rain, and whether it is clean.

Conditions and exceptions

If the water is dirty or smells of sewage, it is a sewer problem, not a drainage problem, and it is urgent.
If water appears with no rain in the previous few days, look for a plumbing leak before looking outside.
This page cannot tell you what is wrong with your house. It can tell you which questions separate the cheap answers from the expensive one.

Drain problem assessment

Local evidence

Every figure below is quoted from the source shown or is our labelled estimate. Verified dates are the day we last checked the source; a figure whose check is overdue is withheld rather than shown.

What the Code says about the ground around the house: The building must be located, or the site graded, so that water will not accumulate at or near the building; Surface water is a separate problem from subsurface drainage, and is much cheaper to fix; Province of British Columbia (BC Codes) · quoted · verified 2026-09-22
Where a foundation drain is allowed to discharge: To a sewer, a drainage ditch or a dry well; A dry well may be used only where the natural groundwater level is below the bottom of the dry well, and must be at least 5 m from the foundation (Sentences 9.14.5.3.(1) and (2)); Province of British Columbia (BC Codes) · quoted · verified 2026-09-22
Do window wells have to be drained?: Yes — every window well shall be drained to the footing level or other suitable location; An undrained window well is a bucket against the wall, and a common single-point cause of a wet basement corner; Province of British Columbia (BC Codes) · quoted · verified 2026-09-22
What a current installation looks like: Two pipes: a solid PVC pipe carrying roof and surface water, and a separate 4-inch perforated PVC pipe taking groundwater from beside the footing; Keeping roof water out of the perforated pipe is the point: a downspout tied into the foundation drain floods the thing that is supposed to keep the basement dry; RainTek Drainage & Waterproofing (Victoria) · quoted · verified 2026-09-22
Camera inspection (drain scope) in Greater Victoria: From $295; The lowest published figure we can cite; a longer run or a difficult access point costs more · Ask whether you receive the video and a written report; RainTek Drainage & Waterproofing (Victoria) · quoted · verified 2026-09-22

Where the water shows up narrows it down more than anything else

Water along the base of a wall, worst at one corner, usually means water is arriving from outside at that corner: a downspout, a slope towards the house, a neighbour's driveway. Water coming up through the slab or through the joint where the floor meets the wall points at pressure under the floor, which is what a perimeter drain is supposed to relieve. Water in a crawl space that never really dries, without any single wet spot, is usually groundwater and ventilation rather than an event.

The Building Code's own starting point is the ground, not the pipe: The building must be located, or the site graded, so that water will not accumulate at or near the building That sentence is doing a lot of work. A great many wet Victoria basements are a grading problem wearing a drainage problem's clothes, and regrading a strip of ground is the cheapest thing on this page.

Go out during the next real rain and watch where the water goes. This is free and it is the single most useful thing you can do.
Follow every downspout. If one ends at the foundation, or disappears into the ground with no record of where it goes, that is your first suspect.
Note whether the wet spot appears during the rain, a day after, or regardless of rain.

The downspout mistake that floods the thing meant to keep you dry

A current installation keeps two separate pipes in the ground. Two pipes: a solid PVC pipe carrying roof and surface water, and a separate 4-inch perforated PVC pipe taking groundwater from beside the footing Roof water is clean, sudden and enormous; groundwater is slow. Putting the first into the pipe designed for the second means that in every downpour the drain around your footings is being pressurised by your own roof.

In older Victoria houses there is often only one pipe to begin with: A single 4-inch pipe, sometimes 3-inch Whatever was connected to it over eighty years — downspouts, a garage drain, a patio grate — is all going through that one line, and none of it was designed for the load.

The Code is explicit about where a foundation drain is allowed to end up: To a sewer, a drainage ditch or a dry well If nobody can tell you where yours discharges, that is not a detail, that is the whole question.

The one cause that is a bucket, not a system

If the wet spot is under a basement window, check the window well before you think about the drain at all. The Code is explicit that this is not optional: Yes — every window well shall be drained to the footing level or other suitable location

An undrained well fills during a long Greater Victoria rain and then holds a column of water against the wall and the window frame for days. Plenty of them were drained correctly in 1962 and have since silted up, or had a gravel bed covered over by landscaping. It is one of the few causes a homeowner can confirm alone, with a hose and ten minutes.

Is this urgent, or can it wait for spring?

Treat it as urgent if the water is dirty, if it is rising rather than sitting, if it is near electrical panels or outlets, or if it has appeared in a finished room. Those are safety and damage questions and they do not wait for a decision about pipes.

Treat it as not urgent — meaning weeks, not hours — if it is clean water in an unfinished basement or a crawl space, it appears only after heavy rain, and it drains away afterwards. Greater Victoria's wet season runs from October to March, so a problem found in September has months of pressure behind it and a problem found in February has already survived the worst of the year. Neither is a reason to sign the first quote.

There is one genuine season effect worth knowing: excavation in saturated ground is slower and messier, and a replacement takes 1 to 4 weeks even in good conditions. If the work is going to happen anyway, the dry months are easier and the quotes are usually less rushed.

What it costs to stop guessing

The cheapest way to convert a guess into a fact is a camera down the drain. Locally that starts at From $295, and it is the only thing that tells you whether the pipe is blocked, broken, or fine. Everything else on this page — including the tool below — narrows the field. It does not see the pipe.

Questions homeowners ask

Can I just wait and see if it happens again?: Yes, if the water is clean, in an unfinished space, and drains away. Note the date, the rainfall and where it appeared. Two or three of those notes are worth more to a contractor than anything you could tell them from memory.
The water only appears in very heavy rain. Does that mean the drain is fine?: No. It means the system copes until it does not, which is what a partly blocked drain looks like. It also looks exactly like a surface water problem that only shows up in a downpour. This is the case where a camera earns its keep.
Is a wet crawl space actually a problem if nothing is stored down there?: It is a problem for the house rather than for your storage: persistent damp moves into the floor structure and the air you breathe upstairs. It is rarely an emergency, and it is rarely nothing.

Your next step

Your symptoms, your house and the weather narrow five causes down to the one or two worth investigating.

Work out the likely cause

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Sources

British Columbia Building Code 2018, Division B, Section 9.14 — Drainage — Province of British Columbia (BC Codes), accessed 2026-09-22
Common drainage questions — RainTek Drainage & Waterproofing (Victoria), accessed 2026-09-22

Code and municipal requirements are quoted from the sources above; price ranges are what named local companies publish, and the companies that publish them sell the work. Nothing here is a diagnosis of a particular house: only a camera in your own drain can tell you what is wrong with it. Report a correction.