Is sewer backup covered by homeowners insurance?

Why standard homeowners policies exclude sewer backup

A standard homeowners policy treats sewer and drain backup as an excluded kind of water damage. The sample ISO HO-3 form, which many insurers build on, lists among its water damage exclusions “water or water-borne material which backs up through sewers or drains or which overflows or is discharged from a sump, sump pump or related equipment.” Triple-I says plainly that sewer backups “are not covered under a typical homeowners insurance policy.”

This surprises many people, because a burst pipe inside the home usually is covered. The difference is the source. A burst supply line is an accidental discharge from your plumbing system. A backup is water and waste pushed back into the home from the sewer system or a drain.

Coverage is sold back as an add-on. Triple-I says it must be bought as a separate product or as an endorsement to a homeowners policy, usually at a nominal cost. Not every insurer offers it on every form. Citizens Property Insurance in Florida, for example, lists water backup of sewers and drains or sump overflow as not covered on its HO-3 worksheet (11/23). Our insurance claims hub has related guides. For other kinds of water loss, see our guide to whether homeowners insurance covers water damage.

What the water backup endorsement covers

ISO’s standard version is form HO 04 95, “Limited Water Back-Up and Sump Discharge or Overflow Coverage.” According to InsuranceXDate, the 03 22 edition is used in 36 jurisdictions. It covers direct physical loss from water backup and sump discharge or overflow that originates within the dwelling’s systems, up to a limit shown in the policy schedule. Flood remains excluded. ISO also has a broader version, HO 06 95.

A 2014 review in PropertyCasualty360’s Claims Magazine described what HO 04 95 adds. It covers water that backs up through a sewer or drain, and overflow or discharge from a sump, sump pump or related equipment, even if the equipment has a mechanical breakdown. It also covers damage from waterborne material. The review noted the endorsement does not raise the policy’s main coverage limits. It sits inside them.

Insurers may write their own versions with different terms, such as whether the limit covers the building, belongings or both. Read the endorsement itself, and the water backup endorsement glossary entry for definitions.

Typical water backup endorsement limits

Backup limits are usually much lower than the dwelling limit. Published figures vary, and they come from different years and methods.

The Zebra also says backup claims often carry a separate deductible. That matters, because a $1,000 deductible on a $5,000 limit leaves at most $4,000 for cleanup and repairs.

Compare that with typical cleanup costs. Our sewage cleanup cost guide reconciles published price ranges. If a finished basement is involved, a low limit may run out quickly. Ask your insurer what limits it offers and what each costs.

Who is responsible for the sewer line: city or homeowner?

Sewer systems have two parts. The main runs under the street and is owned by the city or utility. The lateral is the pipe that connects your home to the main. Triple-I says the lateral is “owned and maintained by the property owner,” including any section that extends into the street or public right of way. The city owns and maintains the main.

That split affects who pays. A blockage in your lateral, such as tree roots or grease, is usually your responsibility. A blockage in the city’s main is the city’s to clear. Whether the city must also pay for damage inside your home depends on local law and the facts, and many cities limit their liability. For tree root damage, Triple-I says costs generally fall to the tree’s owner, though they may be split when both the city and the owner are involved.

Rules differ by city. Call your utility to ask where your responsibility ends. If you think a city main caused your backup, ask whether it has a claim process and deadline. Your own backup endorsement is still the faster route for most owners.

When flood insurance pays for a backup

Flood insurance can cover some backups, depending on what caused them. FloodSmart, the NFIP’s consumer site, says “the cause of flooding matters when determining coverage.” Its example: a backup caused by a heavy rainstorm can be covered, while a backup from clogged pipes is not.

NFIP policies have limits of their own. FloodSmart says homeowner policies cover up to $250,000 for the building and $100,000 for contents, and that personal property kept in basements is not covered. Coverage usually starts 30 days after purchase, with some exceptions.

If you have both a homeowners policy with a backup endorsement and a flood policy, expect each insurer to ask what caused the water. Document the weather, any street flooding, and what your plumber found in the line. For the Category 3 classification restoration crews use for sewage, see water damage categories and classes.

How to lower the risk of a sewer backup

Triple-I lists common causes of backups: aging sewer systems, combined storm and sewer lines overwhelmed by heavy rain, tree roots growing into cracks and joints, and blockages in the city’s main. It also notes that most basement water problems are not caused by sewer backups.

Several steps can help. Triple-I recommends a backwater prevention valve, installed by a qualified plumber in the basement sewer or drain line. It “allows sewage to go out, but not to come back in.” Other steps it lists include disposing of grease in a sealed container, keeping wipes, paper products and feminine products out of drains, cutting tree roots or replacing an old lateral with plastic pipe, and not connecting French drains or sump pumps to the sanitary sewer.

If a backup has already happened, start with safety and our sewage backup emergency steps. For basement-specific guidance, see sewage backup in the basement.

Filing a claim after a sewer backup

If you have a backup endorsement, the claim follows the same basic duties as other property losses. The sample ISO HO-3 lists them: give prompt notice to the insurer or agent, protect the property from further damage, keep an accurate record of repair expenses, and prepare an inventory of damaged belongings. The insurer may also ask to see the damaged property and request records.

Photograph the water level, the drain or fixture where sewage entered, and every damaged item before it is removed. Sewage-soaked porous materials, such as carpet and pad, are usually thrown out, so photos may be your only proof. Keep a plumber’s report naming the cause, such as roots in the lateral, a city main blockage or storm overload. The cause decides whether the backup endorsement, a flood policy or neither applies.

Ask the insurer in writing which limit and deductible apply, and whether cleanup and rebuilding share the same backup limit. For the full claim process and deadlines, see how to file a water damage claim. If the claim is denied, see what to do when a claim is denied.