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Backwater Valve Installation in Toronto
Licensed backwater valve installation with permit, inspection and paperwork for the City subsidy of up to $1,600 per valve.
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Backwater Valve Installation in Toronto
During heavy rain the city sewer can fill faster than it drains, and sewage then flows backwards up your sewer lateral and out through the lowest drain in the house, usually the basement floor drain. A backwater valve is a one-way valve installed in your main sewer line that lets wastewater leave the house but closes automatically when sewage tries to come back in.
POM Plumbing installs, inspects and services backwater valves across Toronto and the GTA. We handle the permit and inspection, install the right valve for your home, and give you the paperwork you need for the City of Toronto Basement Flooding Protection Subsidy.
Request Reliable Backwater Valve Installation Services in Toronto, ON
Types of Backwater Valves
01
Normally Open Valve
The flap stays open and closes only during a backup, so the house vents normally. This is the type most commonly installed in Toronto homes.
02
Normally Closed Valve
The flap stays closed and opens only when water flows out. Useful in some layouts, but it can restrict venting.
03
Full-Port Gate Valve
A manual or combined gate that can be shut by hand, often used where backups are frequent.
Why Toronto Homes Need One
- Combined sewers in many older neighbourhoods overload in storms
- Basement apartments put tenants and finishes at risk
- Insurance companies may require or reward a valve
- City subsidy pays a large part of the cost
- Backup damage often costs tens of thousands to repair
- Peace of mind during every heavy rain
Need it fixed now? Talk to a licensed Toronto plumber — call and get a clear price before any work starts.
Call (905) 625-8777Toronto Basement Flooding Protection Subsidy
The City of Toronto Basement Flooding Protection Subsidy helps eligible homeowners pay for flood protection. For work completed on or after November 12, 2025, the program offers:
The program is for single-family homes, duplexes, triplexes and fourplexes, and requires a licensed plumber, a building permit and inspection. Program details can change, so we confirm current rules on the City website before you start. Read more on our subsidy page.
| Measure | Maximum subsidy |
|---|---|
| Home plumbing assessment | 80% of cost, up to $500 |
| Backwater valve | up to $1,600 per valve, up to 2 valves |
| Sump pump | up to $2,250 |
| Sump pump battery backup | up to $300 |
| Weeping tile (foundation drain) severance | up to $400 |
| Total per property | up to $6,650 |
How Backwater Valve Installation Works
- Assessment. We camera-inspect the sewer and confirm the best location.
- Permit. We apply for the plumbing permit.
- Install. The basement floor is cut, the valve installed with an access cover and the floor patched.
- Inspection. The city inspector checks the installation.
- Paperwork. You receive the invoice and documents for the subsidy.
Maintaining Your Backwater Valve
- Open the cover and check the flap moves freely once or twice a year
- Remove debris and clean the valve body and seal
- Make sure nothing blocks the access cover
- Have it inspected after any backup or major storm
- Never pour grease or flush wipes that can foul the flap
Protect your basement before the next storm.
Backwater Valve Installation Cost
Typical Toronto prices before tax and before the City subsidy.
| Installation | Typical cost |
|---|---|
| Interior basement installation | $1,800 – $3,500 |
| Finished basement or difficult access | $2,800 – $4,500 |
| Exterior installation | $3,000 – $5,500 |
| Added during sewer replacement | $1,500 – $3,000 |
| Annual inspection and cleaning | $150 – $250 |
How Long Installation Takes
Most interior installations take one day. Water use is limited for a few hours, and the floor patch needs about a day to cure before heavy use.
Why Choose POM for Backwater Valves
Related: sump pumps, battery backup, weeping tile, sewer repair and flood restoration.
- Licensed plumbers with permits handled
- Subsidy paperwork ready for your application
- Camera inspection before installation
- Clean installation with floor restored
- Maintenance service and annual checks
Why Choose Us?
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Fully Licenced And Insured
With our company, you can be assured that we are fully licensed and insured to work on your plumbing and sanitation systems, providing you with the peace of mind you deserve.
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Best Warranty In The Market
We stand behind our work and offer the best warranty in the market. This means that you can be confident in our repairs, and if anything goes wrong, we'll be there to make it right.
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Over 20 Years In Business
We have over 20 years of experience in the plumbing industry, which means that we have seen it all. Our knowledge and expertise allow us to provide top-notch service to our clients every time.
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Affordable Pricing
We understand that plumbing repairs can be costly, which is why we offer affordable pricing without sacrificing the quality of our work. When you choose us, you can get the repairs you need at a price you can afford.
Backwater Valve FAQ
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What is a backwater valve and how does it work?
It is a one-way valve in the main sewer line. Wastewater flows out normally, but a flap closes when sewage tries to flow back into the house.
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How much does backwater valve installation cost in Toronto?
Most interior installations cost $1,800 to $3,500 before the City subsidy.
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How much is the Toronto subsidy for a backwater valve?
For work completed on or after November 12, 2025, up to $1,600 per valve for up to two valves, as part of up to $6,650 per property.
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Do I need a permit?
Yes. A plumbing permit and inspection are required, and they are also required for the subsidy.
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How long does installation take?
Usually one day.
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Normally open or normally closed: which is better?
Normally open valves are most common in Toronto because they allow normal venting. We recommend the right type for your plumbing.
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Can I use my plumbing while the valve is closed?
No. When the valve is closed during a backup, water used in the house cannot leave and may back up inside. Limit water use during heavy storms.
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How often should a backwater valve be maintained?
Inspect and clean it at least once a year and after any backup.
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Can a backwater valve be installed in a finished basement?
Yes. We cut a small section of floor and restore it, with an access cover for maintenance.
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Do I still need a sump pump if I have a backwater valve?
If your weeping tile is disconnected from the sewer, a sump pump is needed to remove groundwater.
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Does a backwater valve lower insurance premiums?
Some insurers offer discounts or require one for sewer backup coverage. Check with your insurer.
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