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Backwater Valve Installation, Repair and Replacement Services

At Preferred Plumbing Solutions, we provide backwater valve installation, repair, and replacement services in Markham with experienced technicians who do the job right. We’ll walk you through your options, keep the process simple, and make sure your home is protected every step of the way.

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What is a Backwater Valve?

When heavy rain overwhelms the municipal system or a blockage occurs, a mainline backwater valve can prevent flooding, keep harmful waste out of your living space, and reduce the risk of costly repairs. The device is placed directly into the sewer lateral at the foot of your basement wall, and allows sewage to flow in only one direction – out of your house.

When sewage begins to move toward your basement, the valve closes to protect your system. If your property has experienced water issues in the past or you’re concerned about aging infrastructure, installing a backflow valve in your basement is a smart, preventative step.

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Backwater Valve Plumbing Solutions

The residential plumbing professionals at Preferred Plumbing Solutions offer full-service backwater valve plumbing solutions, including expert installation, repairs, replacement, and maintenance. Our team is highly experienced and committed to helping you avoid unexpected damage with solutions that meet both local code and your home’s unique needs.

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Backwater Valve Installation

A properly installed backwater valve is critical to protecting your home from sewage backups. At Preferred Plumbing Solutions, we follow all manufacturer instructions and local code requirements to make sure your system is both safe and effective.

Municipal Guidelines and Insurance Considerations

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Some municipalities offer rebates or subsidies to help offset backwater valve installation costs, but only if the installation meets their specific requirements. Most require a normally open (or open-port) mainline backwater valve installed directly into the sanitary sewer lateral. This type of sewer backwater valve protects all home plumbing fixtures from potential backup.

In many cases, installing this valve may lower your home insurance premiums or be required for coverage. We’ll help you understand your options and ensure your system meets both local rules and insurance expectations.

Professional Sewer Backwater Valve Installation

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The valve should be installed based on the manufacturer’s installation instructions, which have specifications for placement and grading. Proper placement and sewer backwater valve installation are essential – if the valve is installed in the wrong spot relative to other plumbing fixtures on the sanitary lateral, it could be bypassed entirely. This can result in sewer backup pressure, cracks in the basement floor, and eventual flooding.

If your weeping tiles are still connected to the sanitary sewer lateral downstream of the valve, sewage could be pushed back into the tiles. This may cause structural damage to your foundation and lead to infiltration flooding.

Using Your Plumbing After Backwater Valve Installation

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Ensure that your backwater valve is open when using your plumbing fixtures during an intense rainfall. If you run your water when the backwater valve is closed, it will have no way to exit your home until the valve has reopened.

If you’re not sure if the valve is closed, check it to be sure – you should be able to see it through the clear, plastic top.

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Backwater Valve Repair

If your backwater valve isn’t working the way it should, it might not be protecting your home. Over time, these valves can get stuck, clogged, or damaged, especially if they’ve gone years without being checked. Our team provides straightforward backwater valve repair services to get things back in working order.

You might notice signs like slow drains, sewer odours, or water collecting around basement drains. If anything feels off, we’ll take a look. Our technicians will inspect the valve, clear any blockages, and make the necessary repairs with clear communication every step of the way. If the valve needs more than a quick fix, we’ll talk you through your options so you can decide what’s best for your home

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Backwater Valve Replacement

Some older backwater valves may have seen better days or no longer meet today’s standards. If your valve has been in place for many years, has visible wear, or doesn’t function as reliably as it should, a full backwater valve replacement may be the best long-term solution.

At Preferred Plumbing Solutions, we don’t replace anything unless it’s necessary. But when it’s time for an upgrade, we’ll make sure your new backwater valve is properly installed and up to code. We handle the removal, installation, and testing so your system is ready to do its job without disruption.

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Backwater Valve Maintenance

Like any part of your plumbing system, backwater valves need regular maintenance to keep working the way they should. Without proper care, the valve may fail during a flood, leaving your home vulnerable to serious damage.
Most mainline backwater valves have a clear cover, so you can check inside and see if debris is starting to build up, and the valve should be inspected on a regular basis. If you’re unsure what to look for, or if the valve hasn’t been checked in a while, our same day plumbers can help. Trust us to handle backwater valve maintenance safely and professionally, so you’re not left guessing when it matters most.
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Backwater Valve Services You Can Count On

At Preferred Plumbing Solutions, we’ve helped homeowners across Markham install, repair, and maintain backwater valves for over 20 years. We show up prepared, with clear answers, licensed expertise, and respect for your home.

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Here’s what sets our team apart:
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Experienced Technicians

We bring the training and hands-on experience needed for proper backwater valve plumbing.

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Local Expertise

We work with Markham homeowners every day, so we understand the right way to install and service valves in our area.
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Upfront, Honest Pricing

You’ll always know what to expect – no surprises, no pressure.
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Customer-First Service

We’re known for being easy to reach, quick to respond, and respectful throughout the job.
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Full-Service Support

From inspections to new installations and replacements, we’ll handle everything from start to finish.

Free Outdoor Tap!

Purchase an outside tap replacement and receive a 2nd outside tap replacement at no charge!

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Frequently Asked Questions

How do I know if my home already has a backwater valve installed?

If your home was built after 2007, there’s a good chance it was included. Look for a round access cover or clear cap on your basement floor. If you’re not sure, we can inspect and confirm what’s in place.

How much does backwater valve installation cost?

Costs can vary based on your home’s layout, plumbing access, and permit requirements. We provide clear, upfront quotes and will walk you through any available municipal rebates to help lower your out-of-pocket cost.

Is backwater valve installation covered by the city rebate program?

In many areas, including parts of York Region, homeowners can apply for rebates if they meet certain installation criteria. We’ll help ensure your installation qualifies and provide the paperwork needed for your claim.

Can you service or replace a valve installed by another company?

Yes – we work on all makes and models of backwater valves, regardless of who originally installed them. If you’re unsure about your current setup, we’re happy to take a look.
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