--- title: 'Backwater Valve Installation Plumbing Services' url: 'https://www.plomberie5etoiles.com/en/backwater-valve' markdown: 'https://www.plomberie5etoiles.com/en/backwater-valve.md' lang: en date: '2026-05-08' description: '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 an…' --- Plomberie 5 Etoiles Montreal # Backwater Valve Installation Plumbing Services Code-compliant backwater valve installation to stop municipal sewer backups into your home or business. 4.8 / 5 Google Urgence 24/7 Montreal et region **+110 avis verifies** ![backwater-valve-replacement](https://www.plomberie5etoiles.com/images/b/a/c/k/w/backwater-valve-replacement-480463bd.webp?g-b1ebab99 "backwater-valve-replacement") 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](https://lh3.googleusercontent.com/a-/ALV-UjX6hRmaXkybnk-TTVIZ2KebCIHvhzQqBu4K55sa6xb0pWlY7dU=s64-c-rp-mo-ba12-br100) Vertigo Stardust 7 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… [Read on Google](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnSUQwNmZQcktREAE!2m1!1s0x0:0xe8577a595261d74f!3m1!1s2@1:CIHM0ogKEICAgID06fPrKQ%7C%7C?hl=fr-CA) ![Lison Côté](https://lh3.googleusercontent.com/a/ACg8ocK4vgy9PzgS2__E76I34W7FqlW2CGcPEyr3XHY4Tef3M_adBw=s64-c-rp-mo-br100) Lison Côté 9 months ago Fast, friendly, and professional service. Wow. Thank you. [Read on Google](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21GNmN6bEZXWEpxUTBGb1EweDFkRnBYUzJKNGFGRRAB!2m1!1s0x0:0xe8577a595261d74f!3m1!1s2@1:CAIQACodChtycF9oOmF6czlFWXJqQ0FoQ0x1dFpXS2J4aFE%7C%7C?hl=fr-CA) ![Laurence Corbeil](https://lh3.googleusercontent.com/a/ACg8ocJCmTUaFDMGpoZHdZENcpfu7u2pZlmYolLEl72K6c8upl1RhA=s64-c-rp-mo-br100) Laurence Corbeil 11 months ago The service was good and fast, with relevant advice. [Read on Google](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2pOeFpIZDFWVkYzT1U1VmNHMXhNWE5TWVRjemQzYxAB!2m1!1s0x0:0xe8577a595261d74f!3m1!1s2@1:CAIQACodChtycF9oOjNxZHd1VVF3OU5VcG1xMXNSYTczd3c%7C%7C?hl=fr-CA) ![Yann Laliberte](https://lh3.googleusercontent.com/a-/ALV-UjVuIJ9qH2b3FDTzfGZkgvOpjQyToKom_gIEgSoIGRBCDe5AelsZcQ=s64-c-rp-mo-ba3-br100) Yann Laliberte 9 months ago Courteous, fast, and professional. Thank you. [Read on Google](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21sUlJGcEJWV1UzYm0xS2NYUkNRa04zY3kwM01YYxAB!2m1!1s0x0:0xe8577a595261d74f!3m1!1s2@1:CAIQACodChtycF9oOmlRRFpBVWU3bm1KcXRCQkN3cy03MXc%7C%7C?hl=fr-CA) ![Chantal Labelle](https://lh3.googleusercontent.com/a/ACg8ocJuo-iPl0YTdXExUDJ1P-klmq0YSn5iFDXynBZc92aZmIaQxQ=s64-c-rp-mo-br100) Chantal Labelle 1 year ago Very good service, fast, efficient, and courteous. I highly recommend them. Thank you :) [Read on Google](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnTURJNzVxQU1nEAE!2m1!1s0x0:0xe8577a595261d74f!3m1!1s2@1:CIHM0ogKEICAgMDI75qAMg%7C%7C?hl=fr-CA) ![Claude Massy](https://lh3.googleusercontent.com/a-/ALV-UjUc8n83Q72QK6wlgg4FaPCh5V_yMitbPujm68KO7qxMLZ7-owBkAg=s64-c-rp-mo-ba2-br100) 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 Google](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChdDSUhNMG9nS0VJQ0FnSUNuck9HWXlBRRAB!2m1!1s0x0:0xe8577a595261d74f!3m1!1s2@1:CIHM0ogKEICAgICnrOGYyAE%7C%7C?hl=fr-CA) [See all Google reviews](https://maps.app.goo.gl/nyAfCnzjv1Zy714s8) **Plomberie 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](tel:5144473700)** for **professional installation and inspection**. [Get A Quote](https://www.plomberie5etoiles.com/en/schedule-plumber)[Click To Call](tel:5144473700)--- ## How Does a Backwater Valve Work? A **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: - **Normally open backwater valve** — the flap remains open at all times and closes automatically only when **backflow is detected**. This is the **most common residential option** and meets the requirements of most **municipal subsidy programs in Quebec**. - **Normally closed backwater valve** — the flap remains closed at all times and must be **manually opened for drainage**. This type is used in **specific high-risk or commercial applications**. 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](https://www.plomberie5etoiles.com/en/schedule-plumber)[Click To Call](tel:5144473700)--- ## Backwater Valve Installation Cost in Montreal One 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:** - **Location of the main sewer line** — **accessible vs. buried under a concrete floor** - **Concrete cutting required** — most installations in **older Montreal homes** require **cutting and repouring the basement floor slab** - **Valve type and brand** — **normally open vs. normally closed**, **residential vs. commercial grade** - **Access and pipe condition** — **corroded or offset pipes** may require additional repair work **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](tel:5144473700)** for **pricing and eligibility details**. [Get A Quote](https://www.plomberie5etoiles.com/en/schedule-plumber)[Click To Call](tel:5144473700)--- ### Signs You Need a Backwater Valve **Plomberie 5 Étoiles** recommends a **backwater valve inspection or installation** if any of the following apply to your home: - Your **basement has flooded** during or after **heavy rain** - You have **floor drains** that have **backed up or smelled like sewage** - You live in a **neighbourhood with a combined sewer system** (storm and sanitary share the same pipe — common in **older Montreal, Laval, and South Shore areas**) - Your **municipality recommends installing a sewer backflow prevention valve** - Your home was **built before 1980** and has never had a **backwater valve inspection** - You are **finishing or renovating your basement** and want **flood protection before investing in the space** [Get A Quote](https://www.plomberie5etoiles.com/en/schedule-plumber)[Click To Call](tel:5144473700)--- #### Where Is a Backwater Valve Located? 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](tel:5144473700)**. An **unserviced backwater valve** can **seize shut or fail to close**, leaving your basement **unprotected**. [Get A Quote](https://www.plomberie5etoiles.com/en/schedule-plumber)[Click To Call](tel:5144473700)--- ##### Why Choose Plomberie 5 Étoiles for Backwater Valve Installation?\*\* - **RBQ & CMMTQ certified plumbers** — all **backwater valve installations meet Quebec plumbing code requirements** - **Subsidy assistance** — we help document your installation for **municipal reimbursement programs** - **Concrete cutting and restoration included** — we handle the **entire job**, including **floor repair after installation** - **All valve types and brands** — **normally open, normally closed, residential and commercial** - **Serving Montreal, Laval, North Shore & South Shore** — **same-day and emergency service available** - **100% satisfaction guarantee** — we don’t leave until the job is **done right** ##### TYPES OF BACKWATER VALVES ![Open Backwater Valve](https://www.plomberie5etoiles.com/images/o/p/e/n/-/open-backwater-valve-108d417b.webp?g-b1ebab99) - **Open Backwater Valve**: The flap of this backwater valve is normally opened. When the sewage is backed up, the valve is lifted to close the passage to the backflowing water preventing it from going further into the home or building. ![Closed Backwater Valve](https://www.plomberie5etoiles.com/images/c/l/o/s/e/closed-backwater-valve-a44162fc.webp?g-b1ebab99) - **Closed Baackwater Valve**: The flap on this backwater valve is in the closed position. When sewage is discharged into the sewer, the flap opens up to allow it to pass. However, if the sewer backflows from the city to the home or building, the pressurized water will abut the flap in the closed position. [Plomberie 5 Étoiles](https://www.plomberie5etoiles.com/en) 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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[Get A Quote](https://www.plomberie5etoiles.com/en/schedule-plumber) [Click To Call](tel:5144473700) ##### FAQ ### What is a backwater valve? 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. ### Why do I need a backwater valve? 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. ### What happens to my plumbing when the backwater valve is closed? 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. ### What are the different types of backwater valves? 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. ### How often does a backwater valve need to be 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. ### Do you install backwater valves in Laval and on the South Shore? 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. --- ## Contact Plomberie 5 Étoiles - Phone (24/7): 514-447-3700 - Email: info@plomberie5etoiles.com - Request a quote: https://www.plomberie5etoiles.com/en/schedule-plumber - Service area: Montreal, Laval, South Shore and North Shore (Quebec, Canada) --- ## Navigation - Previous: [Battery Backup Sump Pump Installation in Montreal — Protect Your Basement When Power Fails](https://www.plomberie5etoiles.com/en/battery-backup-sump-pump.md)