What is a backwater valve?

What is a backwater valve?

Do you have a backwater valve in your basement? Have you ever wondered what exactly a backwater valve is? in this article we are going to clarify what a backwater valve is and why you might need one.

The backwater valve is a device that allows water to flow in one direction from your home to the sewer. If any water attempts to flow back towards the backwater valve the device will completely shut down to protect your home allowing no sewage to be able to flow back into your home. In simpler words a backwater valve is a device that lets sewage flow in one direction while not letting it flow backwards. No-one ever expects their sewage water to flow backwards! But it can happen. The most common reason for backflow   is blockages somewhere in the city drain along with surrounding neighbors who continue to use their water systems particularly the ‘out’ pipes to sanitation. The water has nowhere to go and pipes start to fill up due to gravity basements tend to be the first victim when it comes to backflow ! Another common occurrence is during and after heavy rain falls making public drainage and sewage systems become over whelmed hence filling and backing up the pipes causing your basement to flood. A backwater valve WILL NOT fix your drains and cannot do their job and save your home from backups if drains have shifted, collapsed, there are tree roots intrusion, or grease deposit in the home drains.

Do you already have a backwater valve in your basement installed?

Majority of our customers are unaware if they have backwater valves installed on their house drains, especially new home owners. Typically backwater valves are installed inside basements as it is much easier to clean, repair, and maintain. Regarding plumbing codes it is the last device on any drain system just before the drain pipe leaves the home. Usually you will find the backwater valve just before the foundation wall in the basement the device should have an access lid but might be covered by hardwoods or tiles. Additionally, backwater valves could be installed outside as well.

If you make the decision to get a backwater valve installed the first thing your plumber should do is a camera drain inspection to locate the pipe and mark the spot where the device should be installed. Then your plumber would apply for city permit, arrange an inspection and once cleared they can proceed with the work. Normally it takes one day, but sometimes due to soil conditions, accessibility of the spot where back water valve is to be installed it may take two days.

A backwater valve will protect your home and won’t let storm waters together with sewage water enter your basement. Now one might understand why installing such a device is a good move, especially with the weather changes over recent years, heavy downpours in short period of time becomes more and more common.

Rely On Our Wet Basement Waterproofing Experts

The basement waterproofing specialists at  ACCL Waterproofing  know how to repair your basement and foundation walls and keep moisture out of your basement. We would be pleased to develop a guaranteed solution to keep your basement dry!

 

The post What is a backwater valve? appeared first on ACCL Waterproofing.

By Fernando Rebeles June 25, 2026
Many homeowners believe that applying a waterproof coating to a foundation wall is enough to keep water out of their basement. While waterproofing membranes play a critical role in preventing water penetration, the most effective exterior waterproofing systems combine a waterproof membrane with a drainage board.  Together, these components create a complete defense system that protects your foundation from moisture, hydrostatic pressure, and long-term structural damage.
By Fernando Rebeles June 18, 2026
Water is leaking in the basement
By Fernando Rebeles June 10, 2026
Water damage often starts silently behind walls and foundations. Learn how hidden moisture affects your home and how waterproofing prevents costly repairs and mold growth.
By Fernando Rebeles June 9, 2026
Basement waterproofing is most effective before damage occurs. Learn how early prevention protects your foundation, reduces repair costs, and prevents mold growth.
By Fernando Rebeles June 9, 2026
Rainy days ahead....
By Fernando Rebeles April 9, 2026
Spring Has Arrived. Is Your Basement Ready?
basement moisture prevention Ontario, basement waterproofing Ontario, prevent basement dampness, wet
By Fernando Rebeles February 25, 2026
Prevent basement moisture in Southern Ontario year-round. Learn tips to keep your basement dry, safe, and avoid costly water damage today!
By Nkeiruka Iro July 24, 2025
Basements are a valuable part of any home, providing additional space for storage, entertainment, or even living areas. However, basements are also prone to water damage, mold, and mildew due to their underground location. One effective way to protect your basement and enhance its durability... The post The Benefits of Coating Your Basement appeared first on ACCL Waterproofing.
By Nkeiruka Iro July 24, 2025
Waterproofing is a crucial step in protecting buildings and structures from water damage. However, waterproofing systems can degrade over time due to various factors such as weather conditions, wear and tear, and poor maintenance. To ensure that your waterproofing lasts longer, here are some tips... The post Making Waterproofing Last Longer: Tips and Strategies appeared first on ACCL Waterproofing.
By Nkeiruka Iro July 23, 2025
Layering is a crucial concept in waterproofing, involving the application of multiple layers of materials to create a robust and effective barrier against water penetration. In this article, we’ll explore the importance of layering in waterproofing, the different types of layers, and best practices for... The post Layering in Waterproofing: A Key to Effective Protection appeared first on ACCL Waterproofing.