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Sewer Backups & Prevention

Understand what causes sewer backups, who is responsible for repairs, and how to prevent problems at home.

Sewer Backups & Prevention

A sewer backup can occur when wastewater cannot properly flow through the sewer system. This may result in water backing up into drains, toilets, or basements.

This page explains what causes sewer backups, what to do if one occurs, and how to help prevent future issues.

What Causes a Sewer Backup?

Sewer backups can happen for several reasons, including:

  • Blockages from grease, wipes, or other materials in pipes
  • Tree root intrusion into sewer lines
  • Damaged or aging pipes
  • Heavy rainfall or high system demand
  • Issues within private plumbing or the municipal sewer system

Backups can occur on either private property or within the municipal sewer system.

Learn how the wastewater system works: Wastewater Collection & Treatment | InnServices

What To Do If Your Sewer Is Backing Up

If you experience a sewer backup:

  1. Contact your home insurance provider to report potential damage.
  2. Contact InnServices immediately so we can see the issue → Contact Us
  3. You may need a licensed plumbing or drain contractor if the issue is within your home.

Who Is Responsible for Repairs?

Responsibility depends on where the problem occurs.

  • Private property: Property owners are responsible for sewer pipes and blockages within their property.
  • Municipal system: InnServices Operators will assess and complete work related to municipal infrastructure.

Learn more about system ownership: Water Infrastructure Responsibility

How To Help Prevent Sewer Backups

Simple actions at home can help prevent sewer problems:

  • Only flush toilet paper
  • Do not flush wipes, paper towels, diapers, or hygiene products
  • Never pour fats, oils, or grease down the drain

Learn more about proper sewer use: Think Before You Flush

You may also wish to review your home insurance coverage for sewer backup protection.

Safety Notice: Before Clearing a Sewer Line

Before clearing a blocked sewer line outside your home, contact Ontario One Call (1-800-400-2255).

A natural gas line may intersect the sewer line. Ontario One Call provides free safety inspections on behalf of Enbridge Gas.

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Payments Desk Closure

Due to current weather conditions, the in-office payment desk at 7251 Yonge St., Innisfil is closed today to help ensure staff safety.

Our team remains available by phone, and customers can continue to manage their accounts online.

The in-office payment desk will reopen tomorrow at 8:30 a.m.

Thank you for your understanding, and please stay safe.