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Backwater Valve Calgary

If you’ve ever experienced a flooded basement you know how much damage it can cause, especially if you have a finished basement.

Protect your investment in your home. Call Knight and ask if a backwater valve is a good fit for your property.

Our friendly plumbing experts provide quotes in full, will happily answer any questions you may have, and back our service with our 100% guarantee.

Let us put our 40+ years of multi-award-winning plumbing experience at your service!

50 years of HVAC experience
Consumer Choice Award 2021 Southern Alberta
Knight Plumbing's best of the best HomeStars award for 2023.
Top Choice Award icon
Better Business Bureau Rating

What is a Backwater Valve?

A backwater valve ensures that sewage can’t flow from the city sewers into your house. If the city sewers in your area get clogged or overflow, a stopper will close and prevent any sludge from backing up into your home.

For rock-solid reliability and value, we love Mainline Fullport backwater valves. Our Knights in shining armour will provide you with exceptional service- from advice to installation, to guaranteed workmanship. The Knight team of professionals has the solution.

Backwater Valve Diagram

How does a backwater valve protect me?

Backwater valves are there to protect you from flooding- it is the barrier keeping the city sewage from backing up into your home. Unfortunately, nothing can guarantee that you’ll never experience a flood. If one of our rivers overflows its banks and there’s water over the surface of the ground, no valve can stop that. It also cannot prevent clogs inside your home. A backwater valve does one job perfectly: it prevents flooding due to overloaded sewers.

Who Needs a Backwater Valve?

If you have a home on higher ground, you may still be at risk: homes on high ground are not necessarily exempt from needing backwater valves. It’s all about how full the sewers are in your area, and if your home is situated above the grade of the main sewer system.
A backwater valve can technically be installed in any home. However, the drainage slope of your home’s sewer line needs to be at least ¼” per foot. Otherwise, you may need to flush it out once a week. For some people, it’s worth it to avoid ever having to deal with a basement full of sewage. We will do an assessment and let you know what the pros and cons of your situation are.
In older neighbourhoods (pre-1960s) the sewage and storm drains are the same, and one backwater valve will work. In newer areas with separate storm and sewage lines, you may need two.

Backwater Valve Infographic

Backwater Valve Maintenance

A periodic look through the window on the top should tell you if the valve has floated or not (if it’s spring or there’s lots of heavy rain you should check daily). If the valve has floated it means the level of water in the sewer is high. You will need to stop using your water and toilets and call us.

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Why Choose Knight?

Over 40 years of service

Knight has been providing quality plumbing services in Calgary AB and the surrounding areas since 1970. Knight has been accredited by the Better Business Bureau since 1991.

Financing options available

We offer financing with low monthly rates. You can finance almost any kind of service we offer.

24/7 emergency service

We have a true 24-7-365 emergency service with a real person answering the phones: no callbacks, no answering machines, no voicemail.

Award-winning customer service

Let us show you the quality of service that earned us several awards – including the HomeStars Best of Award in 2016, 2017, 2018, 2019, 2020 and 2021!

Full price quote in advance

We never have hidden fees, so you always know what your service will cost before we even start.

100% satisfaction guaranteed

We stand behind our work, and if we fail to completely satisfy you, we’ll happily work with you until we do. The job isn’t done until you’re satisfied.

Service area map

Backwater Valve Service Area

We provide backwater valve services to Calgary, Alberta and its surrounding areas:

Backwater Valve Service Area