Plomberie 5 Etoiles Montreal
Code-compliant backwater valve installation to stop municipal sewer backups into your home or business.
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Montreal et region
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A backwater valve — also known as a backflow prevention valve, sewer check valve, or sewer backup valve — is one of the most important flood protection devices for homes in the Montreal area. When city sewer lines become overwhelmed during heavy rain or spring thaw, sewage can reverse direction and back up into your basement through your floor drains. A properly installed backwater valve stops this completely by allowing water to flow out but never back in.
Customer Reviews
Vertigo Stardust
6 years ago
Well done guys, they've earned their 5 stars My kitchen sink wasn't flushing despite the underneath pipes being clean. My basement toilet was out of order. I called them at 9:30am, the man clearly explained the fees wit…
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Lison Côté
5 months ago
Fast, friendly, and professional service. Wow. Thank you.
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Laurence Corbeil
7 months ago
The service was good and fast, with relevant advice.
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Yann Laliberte
5 months ago
Courteous, fast, and professional. Thank you.
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Chantal Labelle
1 year ago
Very good service, fast, efficient, and courteous. I highly recommend them. Thank you :)
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Claude Massy
2 years ago
Great camera inspection, even earlier than scheduled. Very friendly and gave clear explanations of the work. I truly recommend them. My plumber was Zoiubir. Thanks to Alex.
Read on GooglePlomberie 5 Étoiles installs, inspects, and services backwater valves across Montreal, Laval, the North Shore, and the South Shore. Our licensed and certified plumbers handle every installation according to Quebec plumbing code, with transparent upfront pricing and no hidden fees. Call 514-447-3700 for professional installation and inspection.
Get A Quote Click To CallA sewer backwater valve is installed on your home’s main sewer line, typically in the basement floor. It contains a floating flap mechanism that stays open under normal conditions, allowing wastewater to drain freely from your home to the city sewer system. When sewage begins to reverse direction — due to a blocked city sewer or heavy storm overflow — the flap automatically closes, sealing your home from a backup.
There are two main types of backwater valves that Plomberie 5 Étoiles installs:
Both types function as a sewer check valve — a one-way protection system that prevents backups without requiring electricity or manual intervention during a sewer overflow event.
Get A Quote Click To CallOne of the most common questions we receive is: how much does it cost to install a backwater valve in Montreal, QC? Here is a clear cost breakdown for Montreal and surrounding areas:
| Service | Typical Cost Range |
|---|---|
| Backwater valve installation (new, basement access) | $1,500 – $3,500 |
| Backwater valve installation (requires concrete cutting) | $2,500 – $4,500 |
| Backwater valve inspection | $350 – $500 |
| Backwater valve replacement (existing valve) | $800 – $2,000 |
Factors that affect the cost to install a backwater valve:
Municipal subsidy programs: Many Quebec municipalities, including the City of Montreal, offer financial assistance programs for backwater valve installation as part of their basement flood prevention programs. Ask us about current subsidy eligibility when you call. In some cases, the city may cover $2,500 or more of your installation cost. Call 514-447-3700 for pricing and eligibility details.
Get A Quote Click To CallPlomberie 5 Étoiles recommends a backwater valve inspection or installation if any of the following apply to your home:
A backwater valve is installed directly on your home’s main sewer drain line, almost always in the basement floor. To find yours, look for a round plastic or metal cover — typically 4 to 6 inches in diameter — flush with your basement floor, near your floor drain or laundry area. If you have one, it should be inspected annually to ensure the flap moves freely and the housing is clear of debris.
If you are unsure whether you have a backwater valve, or if your existing valve has not been inspected in several years, call Plomberie 5 Étoiles for a professional inspection at 514-447-3700. An unserviced backwater valve can seize shut or fail to close, leaving your basement unprotected.
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Plomberie 5 Étoiles can quote, install and inspect back water valves / Backflow valves, provide you with all information for backwater valve installation or evaluation.
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Plomberie 5 Étoiles is a member of the Corporation des maîtres mécaniciens en tuyauterie du Québec
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A backwater valve (also called a backflow prevention valve or check valve) is a one-way valve installed on your main drain that allows wastewater to flow out of your home but automatically closes to block sewage from flowing back in when the city sewer system backs up.
During heavy rainfall or snowmelt, city sewer lines can become overwhelmed and back up into homes through floor drains and basement fixtures. A properly installed backwater valve prevents this from happening, protecting your basement and belongings from sewage damage and health hazards.
When the valve closes to block a sewage backup, you temporarily cannot use plumbing fixtures connected to the main drain — such as toilets, sinks, and showers. This is a normal and intentional function of the valve to prevent sewage from entering your home.
There are two common types: an open backwater valve, where the flap is normally open and closes when sewage backs up; and a closed backwater valve, where the flap is normally closed and opens only when wastewater flows out. Both types effectively prevent sewer backflow when properly installed and maintained.
We recommend inspecting your backwater valve regularly, at least once a year. The valve should be checked for debris buildup, cracks in the seal, loose parts, and general wear. Regular maintenance ensures the valve functions correctly when you need it most.
Yes. Plomberie 5 Étoiles installs, inspects, and quotes backwater valves in Montreal, Laval, Longueuil, Brossard, Terrebonne, Blainville and throughout the greater Montreal area. Call 514-447-3700 to schedule an appointment.
