waterdamagequotesCause · the pump that stops in the storm
Sump pump failure and battery backup: why it fails, what cities pay, and what insurance does
A sump pump fails at the worst possible moment by design: the storm that fills the pit is often the storm that takes out the power. A pump with no power and no backup is a hole in the floor that has stopped emptying, and the water that was being kept out comes in.
This page covers that failure from the sources: what federal guidance says every sump pump should have, the backup and alarm options cities will pay towards, what to do when the pump stops, and the insurance question — because a sump pump failure is not covered by a standard Canadian policy, and the coverage that does respond is the one people least expect.
The short version
- Federal guidance says all sump pumps should have an alternate power source and a backup pump that engages if the primary fails.
- Toronto pays up to $300 towards a battery backup; London up to $1,400; St. Catharines funds battery and water-siphon backups inside its single pot.
- GIO places sump pump failure inside sewer backup coverage — the optional endorsement, not the standard policy.
- Calgary says seepage from a sump pump malfunction is the homeowner’s responsibility. The city will not pay for it.
The backup options, by name
| What you would say | What the quote or programme calls it | What it does |
|---|---|---|
| Battery backup | Secondary (backup) pump, battery-powered | Runs when the power is out, until the battery is flat. |
| Water-powered backup | Water-siphon backup system | Eligible in St. Catharines’ regular FLAP. |
| Hydrostatic pump | Hydrostatic sump pump | Excluded from St. Catharines’ Emergency FLAP by name. |
| Generator | Alternate power source | What the federal guidance asks every sump pump to have. |
| Beeper | Sump pump alarm | Inside Toronto’s sump allowance. |
| Overflow pipe | Sump pump overflow | Windsor funds it on its own for an existing pump. |
| When it stops | Sump pump failure | Inside sewer backup coverage, on GIO’s definition. |
Why sump pumps fail when they are needed
Three failure modes account for the scenarios the sources describe: the power goes out in the same storm that is raising the water table; the pump has reached the end of its life, which federal guidance puts at about ten years; and the pit fills faster than one pump can empty it. A fourth is self-inflicted — discharge that runs straight back into the weeping tile, which Calgary prohibits for exactly that reason.
Government of Canada, Get Prepared — Sump pumps · 2026
The federal replacement interval, with the caveat to check the manufacturer's recommendation. The page also says to perform a full pump test once a year.
City of Calgary, Basement flooding and seepage · 2026
The full list, which the City ties to the Community Standards Bylaw: not onto neighbouring properties, lanes, sidewalks, boulevards or streets, and not into a foundation drain or weeping tile. The last item is the one that matters here — sump water sent back into the weeping tile simply comes round again.
Backup power and a second pump
Government of Canada, Get Prepared — Sump pumps · 2026
The storm that overloads the sewer is frequently the storm that takes the power out, which is why this sentence matters more than it reads. Toronto funds the battery backup separately; London funds it at $1,400.
Read the federal sentence closely: it asks for two things, not one. An alternate power source covers the outage. A backup pump covers the primary pump failing for any reason — age, a stuck float, debris. A battery backup pump does both up to the limit of its battery; a generator covers power but not a dead pump. The page also asks for a full pump test once a year, which is the only way to know either will work.
City of St. Catharines, FLAP homeowners’ brochure (2026) · 2026
The eligible work. The property must be a single-detached or semi-detached home built before 2012, inside City limits, with all work under a valid City permit. Before the floods, the City says, FLAP supported about 30 applicants a year on an annual budget of $150,000; it has since received more than 3,500 applications.
City of St. Catharines, Emergency FLAP Homeowner Information (revised September 3, 2026) · 2026
Eighteen months, by the City's count. The same document excludes overland flooding, foundation or structural repairs, exterior backwater valves (for example an adapt-a-valve), normally closed valves, hydrostatic sump pumps and waterproofing, and says condominium and townhouse properties are not eligible.
St. Catharines’ two programmes draw a distinction worth noting: its regular FLAP lists battery-powered or water-siphon backups as eligible, and its Emergency FLAP excludes “hydrostatic sump pumps” by name. If you are applying, ask the City which category a proposed backup falls into before it is installed.
Who pays towards a backup
| Programme | What it funds | Maximum |
|---|---|---|
| Toronto | Sump pump battery backup | $300, at 80% of the invoice |
| Toronto | Alarm, inside the sump pump allowance | $2,250 for the pump and alarm together |
| London | Sump pump battery back-up | $1,400, at 90% |
| St. Catharines | Secondary pumps, battery or water-siphon | Within the $5,000 pot, at 90% |
| Windsor | Sump pump overflow (existing pump) | $300 |
The battery line exists for the power-failure case, which is the case the federal guidance above is written around. London funds the same device at a higher maximum and a higher share.
City of Toronto, Basement Flooding Protection Subsidy Program · 2025
These are the amounts that apply to work completed on or after November 12, 2025. Pages still quoting Toronto's older, smaller maximum are quoting a programme that no longer exists. The City's page carried a modified date of June 18, 2026 when it was read.
The alarm
City of Toronto, Basement Flooding Protection Subsidy Program · 2026
Included in what Toronto's sump pump allowance covers, alongside installation or replacement of the pump itself — up to 80 per cent of the invoiced cost to $2,250 for one device, for work completed after November 12, 2025. The battery backup is a separate line, up to 80 per cent to $300.
An alarm does not stop water. It tells you the pit is filling while there is still time to do something — switch to the backup, move what is on the floor, call someone. Toronto writes it into the same allowance as the pump, which is a reasonable signal of how the City sees it: part of the installation, not an extra.
When it has already failed
- Stay safe around water and power. A flooded basement with a pump plugged in is an electrical hazard.
- Stop adding water from the house — laundry, dishwasher, showers — while the pit cannot be emptied.
- Photograph the pit, the pump and the water before anything is moved.
- Call your insurer, and ask specifically about sewer backup coverage.
- Start drying. Health Canada puts the start of mould growth at 48 hours in an area with excessive moisture.
Health Canada, Guide to addressing moisture and mould indoors · 2026
“Mould will begin to grow in an area with excessive moisture within 48 hours.” Every timeline on this site is built backwards from this number.
City of Calgary, Basement flooding and seepage · 2026
The City continues: it will only assess the flooding situation and does not pump water out of basements. Seepage caused by a sump pump malfunction is also the homeowner's responsibility, in the City's words.
What insurance does with a sump pump failure
General Insurance OmbudService (GIO), Water Damage & Insurance: What will my insurance cover? · 2026
GIO's definition of sewer backup coverage — which is where it places sump pump failure. It describes the coverage as optional, available for most home, rental and condo policies. Public Safety Canada's overland flood page likewise lists sump pump failure among the add-on coverages a policy might include.
This is the fact most homeowners do not expect. A sump pump failure is not a burst pipe and not a sudden escape of water from a plumbing system in the usual sense; on GIO’s definition it sits inside sewer backup coverage, which a standard Canadian policy does not include. A house with a sump pump and no sewer backup endorsement has the risk and not the cover. Ask your broker how your wording treats sump pump failure, and whether there is a separate limit.
Insurance Bureau of Canada, Water Damage and Flood Protection · 2026
IBC's wording is unambiguous: “Damage caused by the backing up of sewers and drains is typically not covered by a standard policy.” It adds that “optional sewer backup is offered by most insurers” — so the cover exists, it is just not switched on by default.
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Questions people actually ask
Do I need a sump pump battery backup?
The Government of Canada says all sump pumps should be equipped with an alternate power source and a backup sump pump that will engage if the primary pump fails.
Is there a rebate for a sump pump battery backup?
Toronto pays up to 80 per cent of the invoiced cost to $300, London up to $1,400 at 90 per cent, and St. Catharines funds battery-powered or water-siphon secondary pumps within its $5,000 Flood Alleviation Program maximum.
Does home insurance cover sump pump failure?
Not on a standard policy. The General Insurance OmbudService places sump pump failure within sewer backup coverage, which is optional and must be added to the policy.
Is a water-powered backup sump pump eligible for a rebate?
In St. Catharines' regular Flood Alleviation Program, water-siphon backup systems are listed as eligible; its Emergency FLAP excludes hydrostatic sump pumps. Ask the city before installing.
How often should a sump pump be tested?
Federal guidance recommends a full pump test once a year and replacement about every 10 years, subject to the manufacturer's recommendation.
Who pays if my sump pump fails and the basement floods?
Not the city: Calgary, for example, says seepage from a sump pump malfunction is the homeowner's responsibility. Insurance pays only if your policy includes sewer backup coverage that responds to sump pump failure.
Where to read next
- Sump pump installation cost and rebates
- The sewer backup endorsement
- Basement flooding
- Backwater valves
- Mould after water damage
Sources cited on this page
- Government of Canada, Get Prepared — Sump pumps
- City of Calgary, Basement flooding and seepage
- City of St. Catharines, FLAP homeowners’ brochure (2026)
- City of St. Catharines, Emergency FLAP Homeowner Information (revised September 3, 2026)
- City of Toronto, Basement Flooding Protection Subsidy Program
- City of London, Basement Flooding Grant Program
- City of Windsor, Basement Flooding Protection Subsidy Program
- Health Canada, Guide to addressing moisture and mould indoors
- General Insurance OmbudService (GIO), Water Damage & Insurance: What will my insurance cover?
- Insurance Bureau of Canada, Water Damage and Flood Protection
Every figure above was read from the source it is attributed to on September 20, 2026. How we check this.
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