Few homeowner nightmares compare to sewage backing up through a toilet, shower or basement floor drain.
Beyond the mess and health concerns, sewer backup events can cause extensive damage to flooring, drywall, furniture and personal belongings — and many homeowners are shocked to learn that their standard homeowner’s insurance policy typically does not cover the loss. According to the Environmental Protection Agency, approximately 75,000 sewage backup incidents occur every year in the U.S.
Sewer backups occur when wastewater cannot flow through municipal or private sewer systems and instead reverses direction, forcing water and sewage back into homes. These incidents are becoming more common as heavier rainfall strains aging infrastructure and overwhelms sewer systems.
A growing risk
Across the country, sewer systems are under pressure. Aging pipes, tree-root intrusions and combined stormwater and sewage lines all increase the risk of backups. Climate change is compounding the problem, with meteorologists projecting wetter conditions and more intense rain events in many regions.
New York City offers a clear example. From July through October 2023, residents logged nearly 5,400 sewer backup complaints — a 14% increase from the same period the year before.
The true cost of a sewer backup
Sewer backup losses can be minor if caught in time, but they can also cause extensive damage. A single event can destroy:
- Carpet, hardwood, tile and subflooring
- Drywall, insulation and baseboards
- Furniture, electronics and stored belongings
- Mechanical systems located below grade
Industry estimates show sewer backup losses often range from $20,000 to $80,000, particularly in homes with finished basements or living space below ground level.
Insurance
Most homeowner policies cover sudden, accidental water damage from sources such as burst pipes. Sewer backups are different. Because the water originates outside the home and flows back through drains, it is excluded unless the homeowner purchases a specific sewer or water backup endorsement.
In most cases, you’ll need a sewage backup rider (or endorsement) to your homeowner’s policy to cover one of these events. Most of these policies cap claim payouts at between $5,000 and $10,000, although larger limits are available from specialty insurers.
That typical limit may not be enough for major damage, but it can defray the cost of repairs and cleanup overall.
Policies will generally cover (up to policy limits) the cost of:
- Cleanup and water extraction
- Repairs to walls, flooring and built-ins
- Replacement of damaged personal property
- Mold remediation related to the covered backup
Pay close attention to deductibles. Some sewer backup endorsements use the policy’s standard deductible, while others impose a separate water backup deductible, often ranging from $1,000 to $5,000. On smaller losses, the deductible can significantly reduce the claim payout.
Finally, policies are relatively inexpensive. The typical policy costs $50 to $250 per year, but premiums can be higher in areas with older sewage lines and infrastructure.
Review your coverage
Sewer backups are not rare events, and the financial impact can be severe. Homes with finished basements, older plumbing or aging municipal sewer systems face higher risk, particularly as heavier rainfall becomes more common.
Purchasing a sewer backup endorsement can help you cover the costs of one of these incidents. Equally important is selecting a limit that reflects the true value of what could be damaged below ground level.