A big flood and a small one are the same job. That surprises people, and it is worth saying plainly before anything else: the size of the puddle is not what decides how much work a flood turns into.
Every water loss gets assessed the same way. Where did the water come from, what has it damaged, and where does the drying equipment go. Those three questions run in that order whether it is a slow leak under a dishwasher or a basement with four inches standing in it.
What changes the job is the category of the water. That is a classification from ANSI/IICRC S500, the water damage restoration standard, and it is the single thing that decides whether your carpet gets dried where it lies or carried out to the driveway.
The three categories, and what they actually mean
Category 1 is clean water. It comes from a sanitary source and carries no substantial risk on contact. A burst supply line, an overflowing basin filling from the clean side, some appliance failures.
Category 2 is grey water. Significantly contaminated — enough to make someone unwell if they contacted or swallowed it. Discharge from a dishwasher or a washing machine. Toilet overflow with urine but no solids.
Category 3 is black water. Grossly contaminated, and capable of causing serious illness. Sewage backflow, toilet overflow with solids, and — the part most homeowners do not expect — ground-source flooding. Storm runoff and snowmelt coming in through a window well, a foundation crack or a backed-up drain is Category 3 by definition, because of what it has travelled across to get to you.
That last one matters in this part of Ontario. The calls that come after a heavy rainfall or a fast melt are not the clean-water calls. They arrive already at the far end of the scale.
The category is not fixed. It gets worse while you wait
Clean water does not stay clean. It warms, it sits, and it contacts whatever is in the floor assembly. Under the standard, Category 1 degrades toward Category 2 in roughly 24 to 48 hours, and Category 2 left untreated past about 72 hours is treated as Category 3.
So the category is partly a decision the clock makes for you. The same burst line is a different job on Saturday morning than it was on Thursday night, and the difference is not the volume of water — it is what the water has become.
There is a second way it escalates, and it has nothing to do with time. Water that has moved sideways through building cavities — the kind that starts in one unit and turns up two doors down — gets handled at a higher category than its source would suggest, because by then nobody can say with confidence what it has been through on the way.
What the category decides
On Category 3, porous materials come out. Carpet, underlay, saturated drywall, batt insulation, baseboard. They are not dried and kept. The standard treats them as contaminated material, and the recommendation is removal rather than restoration. That is the honest answer to "can you save it" on a sewage loss, and it is better heard on day one than day four.
On the walls, it depends on what is inside them. This is where two houses with identical-looking damage get completely different work.
If there is no insulation in the cavity, the wall does not need to be opened up. The baseboard comes off and holes go in low, so air can move through the cavity and take the moisture with it.
If there is insulation, air movement alone will not do it. Wet batt insulation holds water against the back of the drywall and dries from neither side. It has to come out, which means cutting the drywall — at least a foot, and higher if the moisture wicked higher. Then the insulation is removed and drying equipment goes on the cavity itself.
How high that cut goes is a judgement call, not a fixed number. It follows the water: how far up the gypsum the moisture travelled, what is inside the cavity, and what the meter reads on the framing.
Drying to a standard, not to "feels dry"
The cavity is dried to the moisture targets in the standard before anything is closed back up. Not until it looks dry, and not until it stops feeling damp — to a reading.
This is the step that gets skipped when a flood is handled in a hurry, and it is the reason a wall that was "fixed" in the spring smells in July. Trapped moisture behind sealed drywall is also how mould gets its start, which is the whole argument for drying to a number rather than to an impression.
Nobody knows the category from the phone call
Everything above gets decided on site. A description over the phone narrows it down and it does not settle it — the same call can turn out to be Category 1 or Category 3, and which one it is depends on things the caller often cannot see: how far the water has already travelled, what it crossed on the way, and how long it sat before anyone noticed.
That is why the assessment is the first thing that happens rather than a formality before the real work. It is also why the job is taken before the category is known. Any loss that needs water damage restoration gets attended — clean water or black, one room or a whole basement.
Getting someone out
Water damage and flood cleanup are around-the-clock work here, which is not the same thing as carpet cleaning — that runs on normal hours. A flood does not, and an emergency callout carries an emergency service fee.
Kharl Reynolds is IICRC-certified in water damage restoration (WRT), the certification that sits against the S500 standard this article describes, and he assesses the loss himself. The service area is the same twelve cities as the rest of the work: Brampton, Mississauga, Milton, Oakville, Georgetown, Caledon, Burlington, Toronto, Etobicoke, Vaughan, Markham and Richmond Hill.
If there is water in your building now, the useful call is the early one. Not because the flood gets bigger, but because the category does.
437-873-3116, any hour.