Back Water Valve Installation & Service


We’ve all see the adds especially in Toronto, where the city is recommending homeowners install main line back water valves on their sanitary drain lines. The Mainline Full port Backwater Valve is currently the only backwater valve approved in the Province of Ontario for home installation on the main sanitary sewer lateral. These valve boxes stop city sewage from backing up into your home. Caldwell plumbing has installed several of these devices for many home owners which no longer have too worry!
back water valve

Back Water Valve Regular Maintenance

After installation of a back water valve its important to have it serviced annually to ensure its in good working order. The walls of the valve can accumulate scale buildup so its important to keep it clean so it can work without any obstruction.


Valve Installation

Caldwell Plumbing will install your backwater valve.

Alarm Installation

Our team of professionals can install a backwater valve alarm system.

Valve Replacement

Need your backwater valve replaced, no problem we can help.

Do I need a backwater valve?

A few things to keep in mind when debating whether you should have one installed If you’re unsure whether you need a back-water valve we encourage you to call us to determine if you are at risk:


If your neighborhood is older then 40 years you could be at risk of old city infrastructure backing up into your home.

The Toronto Municipal building code states all new homes must have a “Full Port Main Line Back Water valve” installed immediately before the property sewer exits the foundation of the home.

For existing houses the Municipal Building Codes require you to have a full port main line backwater valve installed

If your property has a low elevation (at the bottom of a street) and your main floor is below the most up stream manhole you are required to install a Back-water valve according too the municipal building code.




Available subsidy

Available subsidy = 80% of the invoiced cost up to a maximum of $1,250 regardless of the number of devices installed at the property, including eligible labour, materials, permit and taxes.


We offer free plumbing estimates for all of our work. Fill out the form to the right and receive a free estimate for your next plumbing project.