*Updated October 21st, 2025

According to the Insurance Information Institute, most standard homeowners insurance policies do not cover sewer backup or water backup damage. If your sump pump fails to handle runoff after a heavy rainstorm, that overflow usually isn’t covered either. Without backup coverage or a home warranty, that flood in your basement could leave you paying for water and sewer repairs out of pocket.

Why Sewer Backups Happen

Even though they aren’t always covered under homeowners insurance, sewer backup incidents are fairly common. They can result from many issues, including:

  • Aging sewer line systems

  • Combined pipelines that carry both storm runoff and sewage

  • Tree roots invading sewage line connections

  • Blocked sanitary drains or clogs that cause water damage in basements

Without proper insurance coverage, damage caused by sewer backups can lead to major repair bills for your foundation of your home, plumbing, or flooring.

How to Protect Your Sewer Line and Prevent Water Backup

The best way to handle backup issues is to plan ahead. While standard homeowners insurance doesn’t automatically include sewer backup coverage, you can add it through a small endorsement to your home insurance policy.

Here are key steps to protect your property and prevent backups:

  • Replace damaged sewer lines. If you have an old clay or iron sewer line, upgrade it with modern plastic piping—it’s more durable and easier to repair.

  • Fix illegal plumbing connections. A professional plumber can identify and correct improper hookups that may contribute to backups.

  • Install a backwater protection valve. This device ensures sewage flows out of your home but can’t return through your drains. Have a qualified plumber install it correctly.

  • Dispose of grease and paper waste properly. Never pour grease down the drain, and only flush toilet paper to prevent clog and overflow.

How Backup Coverage Can Help

Backup coverage is an optional add-on to homeowners insurance that helps cover damage caused by sewage backup, sump pump overflow, or water backup from your water and sewer line.

This type of insurance coverage—sometimes called water backup coverage—helps cover repair or cleanup expenses when your sump pump or plumbing can’t keep up with heavy rain or a city’s sewer line backup. It can also help cover the cost to remove water, replace damaged property, and repair damage to your home.

Backup coverage can help pay for:

  • Repairs to floors, walls, and personal belongings damaged by overflow

  • Cleanup of sewage or contaminated water

  • Damage to the sewer line or service line connecting to the sewer main

Does Homeowners Insurance Cover Sewer Backups?

Most homeowners insurance policies exclude water and sewer backups because they are not considered a “sudden or accidental” peril. However, insurance companies offer sewer backup coverage or sewer line coverage as a separate endorsement.

Your insurance agent can explain coverage limits and whether your homeowners insurance cover extends to sump pump failure, accidental water damage, or damage to your property from a septic system issue.

If you experience repeated backup issues, you may also want to explore a utility line endorsement, which can help cover damage to the sewer line or water and sewer line located outside your home but within your property boundaries.

Get Water Backup Coverage Before It’s Too Late

Home insurance covers many risks, but it usually won’t cover damage from sewer backup or water backup unless you’ve added backup coverage to your policy. Because backup coverage is an optional type of insurance, you’ll need to request it through your insurer or contact your insurance professional to review your coverage options.

Adding sewer backup coverage or a service line endorsement to your home insurance could save you thousands in cleanup and repair costs if a sump pump overflow or sewage backup ever happens.

Final Thoughts: Protecting Against Sewer and Water Damage

Sewer backup coverage isn’t just for older homes—it’s essential protection for anyone with a water and sewer line connection. A single backup coverage endorsement could make the difference between a quick cleanup and a devastating loss.

Review your homeowners policy, ask your insurance agent about sewer line coverage, and get water backup coverage before disaster strikes. The right home insurance and backup coverage can help cover the cost to restore your property, repair plumbing, and prevent water damage in the future.