The Flood Claim Documentation Checklist Every Niagara Homeowner Should Keep

When three storms dropped almost 400 mm of rain on St. Catharines in the last week of July 2026, the difference between a smooth claim and a painful one came down to something homeowners did in the first 48 hours: documentation. Adjusters were buried in files. The claims that moved were the ones with dated photos, a clear water source, and a paper trail. The ones that stalled had a shop-vacced basement, a full curb, and no evidence left.

You cannot control the next storm. You can control how ready your file is. This checklist is written to be saved, printed, and used the next time water gets in, whether that is a flooded basement, a ceiling stain after a windstorm, or both.

First 24 hours: document before you clean

The instinct after a flood is to start hauling and drying immediately. Do the safety basics first (power off to affected areas, no standing water near outlets), then spend twenty minutes capturing evidence before anything moves:

• Video walk-through first. One continuous phone video of every affected room, narrating what you see. Timestamped video is the fastest way to capture the full scene.
• Photograph the high-water line on walls, appliances, and furniture, with something for scale (a tape measure or even a pop can).
• Photograph the water source, or your best evidence of it. Water coming up a floor drain, seeping at a wall, dripping from a ceiling stain, or sheeting over a clogged eavestrough are four different claims. Capture which one you have.
• Photograph every damaged item where it sits before it goes to the curb. Wide shot plus close-up of the make and model label where there is one.
• Do not discard anything until it is photographed and listed. Insurers can ask to see damaged property. Once the truck takes it, your photos are all that is left.

Then mitigate. Ontario policies expect you to take reasonable steps to prevent further damage, so drying, tarping, and moving contents is not just allowed, it is expected. Keep receipts for fans, dehumidifiers, tarps, and any emergency service call.

Know which coverage you are actually claiming under

This matters more than most homeowners realize. In Ontario, water damage falls under different coverages, and two of the big ones are optional endorsements that are not on a standard policy by default:

• Overland water covers water entering from outside at ground level, such as surface runoff from heavy rain. Optional in Ontario, and many policies do not carry it.
• Sewer backup covers water coming up through drains and plumbing. Also optional, and its absence is one of the most common reasons a flooded-basement claim gets denied outright (IBC guidance for Ontario residents).
• Water entering through storm damage to the roof or building is generally handled under your base policy’s wind and storm coverage, which is why identifying the entry point matters so much.

Pull your declarations page now, before you ever need it, and look for the exact words “sewer backup” and “overland water.” If neither appears, that is a conversation to have with your broker this week, not during a claim. Our Ontario roofing and home insurance guide goes deeper on how roof age and condition affect all of this.

The checklist

Save this part.

1. Date and time the water appeared, and the weather at the time. Write it down while it is fresh.
2. Continuous video walk-through of all affected areas.
3. Photos: high-water line, water source or entry point, every damaged item in place.
4. A written contents list: item, approximate age, approximate replacement cost. Start it day one, add to it as you find things.
5. Receipts folder: mitigation supplies, emergency calls, restoration work, even the dump run. Everything.
6. Call your insurer and get a claim number. Sooner is better. In the 2025 storm season, homeowners who contacted their insurer within 48 hours consistently had smoother claims.
7. A claim log: date, who you spoke to, what was said, for every call and email. One page in a notebook is enough.
8. The proof of loss form, on time. Most Ontario policies require a sworn proof of loss within a set window, commonly 90 days. Missing it can sink an otherwise valid claim. Ask your adjuster for the deadline in writing.
9. An independent report on where the water got in (more on this below).

Establish the storm date with a source

An adjuster wants to connect your damage to a specific weather event. “It was that big storm in July” is weak. “The July 27-28 overnight storm, 20 to 35 mm in six hours, sourced here” is strong.

That is exactly why we run the Niagara Storm and Weather Damage Tracker. Every entry has the date, the municipalities affected, the measured wind or rainfall where reported, and a link to the source. If your damage traces to a logged event, cite it in your claim file. Environment Canada’s historical climate data is the primary source behind many entries and works as backup documentation too.

Why a roofer’s written report belongs in a flood claim

It sounds backwards, but a large share of “basement floods” we inspect started at the roofline: overwhelmed eavestroughs, a popped downspout joint, wind-lifted shingles that let a six-hour rain in. We covered the mechanics after the July 27-28 overnight storm and again during the St. Catharines state of emergency.

The entry point can change which coverage applies and how the claim is assessed. A written inspection report that says “water entered at the north valley where shingles were wind-creased, consistent with the July 1 windstorm” gives your adjuster something concrete. Our storm damage repair guide walks through the roof-specific side of a claim in detail.

We provide that documentation in writing after every roof inspection, whether or not any work follows. If the damage is active, our emergency roof repair crew can tarp and stabilize first, and that mitigation receipt goes straight into your file.

Keep this list somewhere you will find it

Print it, screenshot it, or bookmark it. The homeowners who came through the 2026 flood season best were not the luckiest ones. They were the ones with photos from before the curb, a claim number from day two, and a clear answer to “where did the water come in.”

If you are staring at a stain, a damp wall, or a basement that took water and you do not know the entry point, call us at (289) 271-7854 or book a free inspection. We will trace it, document it in writing, and you will have the one piece of the checklist you cannot do yourself. We serve the whole region, from St. Catharines and Thorold to Welland and Niagara Falls.