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Backwater Valve Installation Subsidy


In the event of heavy rainfall, homes that do not have a backwater valve installed on their underground sewer pipes are at a greater risk of sewer back up and basement flooding.

How does a Backwater Valve reduce potential for basement flooding?

During intense rain events, the wastewater (sanitary) sewer may become overloaded with rain water. This can result in the overloaded sewer forcing wastewater to flow backward into basement drains. A backwater valve is designed to prevent wastewater from backing up through the wastewater pipe into your home.
During normal use, the backwater valve remains open. This allows wastewater from your toilets, shower, sinks, etc. to flow freely from your home to the wastewater main. If flow reverses because the wastewater main is overloaded with rain water, the backwater valve will automatically close, thereby protecting your basement from potential wastewater backup. Once the rain event is over, the backwater valve will re-open to allow wastewater to flow normally to the sewer main.

Animation illustrating the backwater valve in it's working state; allowing a one way flow from the home to the sanitary sewer, and it's closed state; which prevents sewer overload water from entering the home during a back up.

Financial support

Halton Region’s Backwater Valve install subsidy covers 50% of costs incurred for materials and labour charged to install a backwater valve, up to a maximum of $675.

Eligibility criteria

  • The Backwater Valve must be installed inside the home.  External installations are not eligible.
  • This is a one-time subsidy per property.
  • The residence where the work is undertaken must be located in Halton Region.
  • The residence where the work is undertaken must have municipal wastewater services (not on a septic system).
  • All work must have been completed after July 1, 2016.

Please review the full Terms and Conditions in the subsidy application form before beginning backwater valve installation and/or sanitary lateral repairs.

Application requirements

  1. Ensure the backwater valve is installed inside your home (backwater valves installed outside the home are not eligible for Halton’s subsidy).
  2. Application must include:
    1. Written confirmation from contractor conducting the work that weeping tile/foundation drain is not connected to the wastewater lateral (sanitary sewer). For more information on weeping tile disconnection subsidy, Click here.
    2. A copy of your building permit obtained from the Local Municipality i.e. Town of Halton Hills, Town of Milton, Town of Oakville or City of Burlington
    3. Confirmation that the building permit has passed final inspection through the Local Municipal Building Inspector i.e. Town of Halton Hills, Town of Milton, Town of Oakville or City of Burlington
    4. Itemized invoice showing paid in full, specifically listing any materials and labour, and identifying specifics of each component of repair/work.   This is especially important if you are applying for more than one subsidy. 

Invoice Requirements

Invoice MUST include:

  • Details of work completed.
  • Itemized specific costs to determine eligible costs, such as CCTV videos, inspections and specifics about repair/installation (examples: spot repair, backwater valve installation and building permit).
  • Shows that the invoice is paid in full.

View example invoice

Apply to the program

  1. Download the Enhanced Basement Flooding Prevention Subsidy Program application form (PDF file) and the Enhanced Basement Flooding Prevention Subsidy Program waiver form (PDF file) .
  2. Submit completed Application Form and Waiver along with the required documentation, electronically. Ensure submission completeness by following the Check List included on page 3 of the Application Form. Errors or omissions will delay approval of the subsidy.
  3. Scan and email your completed submission to
  4. Upload larger files, such as CCTV video, to our online Dropbox platform here:

For assistance with using Dropbox

Please see Dropbox instructions and example below:

  • Where Dropbox requests “Your Email”:
    • Insert Applicant’s email address
  • Where Dropbox requests “Subject”:
    • Insert Applicant’s last name, followed by address
  • Where Dropbox requests “Message”:
    • Insert brief description of each file you are attaching such as "Invoice"
  • Where Dropbox requests “Password”:
    • This is not a required field.   If you do create and include a password for your Dropbox account, please email the password to to allow staff to view and process your submission.  Without the password, staff cannot view your Dropbox files.
  • Where Dropbox requests “Expire Date”:
    • This is not a required field.  If you add an expiry date, it will prevent Halton staff from seeing the file past the expiry date.
  • Where Dropbox requests Recipient “Email”, please insert the following email address:

See Dropbox online form example below:

A dropbox visual depicting the instructions to upload a file to the 2big4email dropbox.

Additional options for subsidy submission include the following:

  • Mail to:
    Halton Region Public Works
    c/o Water and Wastewater Program Ambassador
    Woodlands Operations Centre
    1179 Bronte Road, Oakville, ON L6M 4G3
  • Drop off in person:
    Place submission in the black mail box located in front of the sliding doors at the main entrance to Halton Regional Centre, located at 1151 Bronte Road, Oakville 
drop box location in front of HRC

Note: Woodlands Operations Centre is currently closed to the public.