Backwater Valve Maintenance: A Simple Step to Help Prevent Basement Flooding

Backwater valves play an important role in helping protect homes from basement flooding caused by sewer backups, especially during heavy rain.

If your home has a backwater valve, regular inspection and maintenance are essential to ensure it continues to function properly.

Why Maintenance Matters

A backwater valve is designed to allow wastewater to flow out of your home while preventing it from flowing back in if the sewer system becomes overwhelmed.

Over time, debris can build up inside the valve. Without regular maintenance, this can prevent the valve from working effectively when it is needed most.

Hamilton Water recommends that homeowners:

• Inspect and clean their backwater valve every 2–3 months

• Check it before significant rainfall events

• Ensure it is clear of debris and operating properly

These small steps can make a meaningful difference in reducing the risk of basement flooding.

City Outreach and Support

Hamilton Water is contacting approximately 12,000 properties identified as having backwater valves installed, providing information on maintenance and care.

This outreach is part of ongoing efforts to help residents stay prepared and protect their homes.

The information provided includes guidance for the two types of backwater valves commonly used in Hamilton, along with step-by-step maintenance instructions.

Funding Available Through the Protective Plumbing Program

Eligible homeowners may qualify for funding through the Protective Plumbing Program to install or upgrade flood protection measures, including:

• Backwater valves

• Downspout disconnection

• Other protective plumbing improvements

Disconnecting downspouts helps redirect rainwater away from the sewer system, reducing strain and lowering the risk of flooding.

Learn More

For more information on backwater valves, maintenance, and available programs:

🔗 hamilton.ca/backwatervalves