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Ottawa home insurance guide · after the July 1 flood
Overland Water Coverage: The Ottawa Home Insurance Gap That Denies Flood Claims
By Nick Bachusky, Mortgage Agent Level 1, Referral Mortgages Inc. · Published July 15, 2026 · Reviewed August 2, 2026
On July 1, 2026, a record rainstorm dropped more than 118 millimetres of rain on Ottawa in a single afternoon. In the days that followed, the City of Ottawa reported close to 5,800 flooded basements. Then came a second wave of bad news in the mail: denied insurance claims.
Some homeowners never had overland flood coverage. Others had it, but the limit was a fraction of what a finished basement rebuild costs. These were not careless people. Most of them simply bought the policy their lender required at closing, filed it away, and never looked at it again. If you have ever typed “home insurance Ottawa” into Google the week you closed, this is the part nobody explains.
I am a mortgage agent, not an insurance broker, so I cannot sell you a policy and I will not try. But I sit at the closing table with Ottawa homeowners every week, and home insurance is a required part of every mortgage. That makes closing week, and every renewal after it, the natural moment to ask the right questions. Here they are, plus a quick self-check you can run on your own policy in two minutes.
The short version
- Standard home insurance in Canada was built around fire. Water protection is mostly optional add-ons you have to request and pay for.
- Overland water coverage (flood) and sewer backup coverage are two separate endorsements. Carry one but not the other and a claim can still be denied.
- Ground water and seepage through foundation cracks is generally excluded from every policy. Insurers treat it as maintenance.
- Your lender only requires fire insurance and sits as loss payee. It never checks whether you added flood or sewer backup coverage. That is on you.
- Some insurers cap overland water at $10,000 to $25,000 unless you ask for more. A finished basement can cost several times that to restore.
- Closing week and every renewal are the natural moments to review this, because you are already arranging proof of coverage for the mortgage.
What is overland water coverage, and does home insurance cover flooding?
Overland water coverage is an optional endorsement that pays when water flows over land and into your home, from heavy rain, an overflowing creek or fast snowmelt. It is not in a standard policy. So the honest answer to does home insurance cover flooding is: only if you added the water endorsements yourself, and only for the type of water that actually got in.
Standard home insurance in Canada was built around fire. Fire, smoke, wind and theft are typically included in a base policy. Water is a different story. It only became widely available as overland flood insurance across Canada after the 2013 Calgary and Toronto floods, and it is still an add-on with most insurers. You can read the plain-language basics on the federal government’s home insurance page and the Insurance Bureau of Canada’s guide to how home insurance works.
Here is the part that catches people. Your lender requires proof of insurance before it will fund, but it only requires the fire portion. It never checks whether you added water coverage. So the coverage that actually protects an Ottawa basement is the coverage nobody is watching for you.
One afternoon, in real numbers
What the July 1 storm actually exposed
A single storm turned a paperwork detail into a five-figure problem for thousands of households. The gap was not bad luck. It was the difference between a bare policy and one built on purpose.
118 mm
of rain in a single afternoon
~5,800
flooded basements reported to the City
Typical overland water cap unless you ask for more $10k to $25k
A finished basement can cost several times that limit to restore, which is why the number on your policy matters as much as the fact you have coverage at all.
Figures as reported by the City of Ottawa following the July 1, 2026 storm. Dated example, not a forecast. Confirm your own limits with your insurer.
Why does a basic policy leave gaps?
Because water gets into a home three different ways, and a standard policy treats each one differently. Overland flooding and sewer backup are separate optional endorsements, and ground water seepage is usually excluded entirely. Carry the wrong combination and the cause of loss can sink your claim.
Here is the trap. If overland water pushed through your basement window while the sewer also backed up through your floor drain, the cause of loss decides who pays. If you hold one endorsement but not the other, your claim can be denied even though your basement is just as wet either way. This is how the three types compare.
| How water enters | In a standard policy | What to know |
|---|---|---|
| Overland water (flood) Water flows over land into your home, from heavy rain, an overflowing creek or fast snowmelt. | Optional add-on | Only widely available in Canada after the 2013 Calgary and Toronto floods. Still an endorsement with most insurers. |
| Sewer backup Water comes up through your floor drain, toilet or sump because the municipal system is overwhelmed. | Separate add-on | A different endorsement from overland flood. Many Ottawa basements flooded exactly this way on July 1. |
| Ground water and seepage Water gradually enters through cracks in your foundation over time. | Excluded | Generally not covered by any policy. Insurance treats it as a maintenance issue, not a sudden loss. |
So sewer backup coverage is not the same thing as overland flood, and neither one is automatic. When my clients ask me what to check first, I tell them to confirm they carry both water endorsements, then to read the limits, because a low limit is its own kind of gap.
Two-minute self-check
The 10 questions to ask your insurance broker
Whether you are arranging a policy for a purchase closing or reviewing one at renewal, these are the questions that decide whether you are actually protected. Tick each one you can honestly answer yes to. Anything you leave unticked is a gap worth a phone call.
0/10
Start ticking to see your coverage read.
Nothing is sent anywhere. This runs entirely in your browser.
Buying, renewing or refinancing? I can make sure the financing side of your home is as solid as the coverage side. Message me on WhatsApp and I will point you to insurance brokers I trust.
A few of these deserve extra attention. On question nine, a backwater valve, a sump pump with battery backup, a monitored alarm and a newer roof can all lower your premium, and the device often pays for itself twice, once in savings and once by keeping the water out. On question two, remember that sewer backup insurance is a separate line item, so ask for its limit in dollars, not just a yes.
What about government help after a flood?
There is help, but treat it as a backstop, not a plan. After the July 1 storm, Ontario activated the Disaster Recovery Assistance for Ontarians program for eligible areas of Ottawa. It is genuine support for people who were uninsured or underinsured, but it comes with real limits.
The program generally excludes sewer backup damage, it only restores a home to a basic standard, and local representatives have warned that reimbursement can take months. You can read the eligibility rules on the Ontario disaster recovery assistance page. The City of Ottawa’s compassionate grant provides up to $1,000 in specific sewer surcharge situations, which is real but modest against a finished basement.
The City of Ottawa also runs a Residential Protective Plumbing Program that helps eligible homeowners cover the cost of installing backwater valves and sump pumps, and it announced plans to expand the program after the storm. A properly built insurance policy still pays faster, covers more, and does not depend on the province declaring a disaster.
From how I actually work
When my clients refinance for a renovation, especially a basement finish, I always raise insurance in the same conversation. A newly finished basement dramatically increases what you have at risk below grade, and the old limits from before the reno rarely make sense anymore.
I cannot sell you a policy. What I can do is connect you with insurance brokers I trust, and make sure the financing side of your home is as solid as the coverage side. That is the kind of thing a bank never brings up, because nobody there is watching your whole picture.
When is the right time to deal with this?
Two moments in your mortgage life line up perfectly with reviewing your coverage: at closing and at renewal or refinance. Both are times you are already dealing with the lender, so the extra twenty minutes on coverage costs you nothing.
At closing
Your lender requires proof of home insurance before funding, so you are already making the call. Spending that call on the ten questions above, instead of just buying the cheapest fire policy, can change everything later. The difference between a bare policy and a properly built one is often a few hundred dollars a year. This is part of why I walk Ottawa buyers through closing before it becomes a scramble, and something I flag early with first-time buyers in Ottawa who have never arranged coverage before.
At renewal or refinance
If you are refinancing to fund renovations, tell your insurance broker. A finished basement changes your risk below grade, and your old limits may no longer fit. I flag this every time I structure a refinance for a renovation, and I raise it again whenever we plan an Ottawa mortgage renewal, because renewal is a natural moment to review the whole file.
That is the honest playbook. I keep the financing side clean and complete, ideally broker complete three weeks before closing, and I make sure you are asking the coverage questions while you still have time to act on the answers. If you want to talk it through, here is how I work.
Still wondering?
Frequently asked questions
Is flood insurance mandatory in Ontario?
No. Lenders require fire insurance as a condition of your mortgage, but overland flood and sewer backup coverage are optional endorsements. That is exactly why so many Ottawa homeowners discovered gaps after the July 1, 2026 storm.
Does home insurance cover flooding in Ottawa?
Not automatically. A base policy covers fire, smoke, wind and theft. Whether does home insurance cover flooding depends on the endorsements you added: overland water coverage for surface flooding and a separate sewer backup endorsement for drains. Without them, a flood claim can be denied.
What is the difference between overland flood and sewer backup coverage?
Overland flood coverage applies when water flows over the ground and into your home, such as from heavy rain. Sewer backup coverage applies when water comes up through your drains because the municipal system is overwhelmed. They are separate endorsements, and a claim can be denied if you carry one but the damage was caused by the other.
Will my mortgage lender check my flood coverage?
Your lender requires proof the home is insured for fire before closing, and they are listed as loss payee on the policy. They do not typically verify whether you added flood or sewer backup coverage. Those protections are your responsibility to arrange.
Can I get help paying for flood protection upgrades in Ottawa?
Yes. The City of Ottawa’s Residential Protective Plumbing Program helps eligible homeowners cover the cost of installing protective plumbing such as backwater valves and sump pumps, and the city has announced plans to expand it after the July 1, 2026 storm. Many insurers also offer premium discounts once these devices are installed.
Does home insurance affect my mortgage approval?
Proof of home insurance is a standard funding condition on every mortgage. Your approval does not depend on which optional coverages you choose, but funding will not proceed without a policy in place, which is why closing week is the natural time to review your options properly.
About the author
Nick Bachusky
I am Nick Bachusky, a Mortgage Agent Level 1 working under Referral Mortgages Inc., FSRA brokerage licence #13316. I sit at the closing table with Ottawa homeowners every week, so I see exactly where the coverage questions get skipped, and I would rather you ask them now than after a storm.
I work one file at a time and keep it plain. Every client should feel like my only client. If you are buying, renewing or refinancing, I am one WhatsApp message away.
Nick Bachusky · Mortgage Agent Level 1 · Referral Mortgages Inc. · FSRA brokerage licence #13316. I am not an insurance broker and this article is general information, not insurance advice. Storm figures and coverage limits are dated examples (July 2026), not guarantees. Always confirm your own policy with your insurer.
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Nick Bachusky · Mortgage Agent Level 1 · Referral Mortgages Inc. · FSRA brokerage licence #13316. General information, not insurance advice.