Water is the most common source of home insurance claims and the most common source of coverage disputes. The reason is that "water damage" describes a dozen different events that policies treat completely differently.
Two tests decide most cases. Where did the water come from, and was the event sudden or gradual?
The two tests
Sudden and accidental versus gradual. Standard policies cover a sudden, accidental discharge from a plumbing, heating, air conditioning or appliance system. They do not cover damage that developed slowly through seepage, leakage over time, wear, or lack of maintenance.
A pipe that bursts today is generally covered. A pipe that has been weeping behind a wall for eight months generally is not, even though the visible damage appeared all at once.
Top down versus bottom up. A useful rule of thumb: water arriving from above, such as rain through a storm-damaged roof, is generally a homeowners matter. Water rising from below or spreading across the ground is generally flood, which is excluded and needs a separate policy.
Where common scenarios fall
| Scenario | Typically covered? |
|---|---|
| Supply pipe bursts | Yes, sudden and accidental |
| Water heater fails suddenly | Yes for resulting damage. The heater itself is often not covered |
| Washing machine hose ruptures | Yes for resulting damage |
| Wind removes shingles, rain enters | Yes, wind created the opening |
| Ice dam forces water under shingles | Commonly yes |
| Upstairs neighbor's overflow reaches your unit | Commonly yes |
| Slow leak under a sink over months | Generally no, gradual |
| Seepage through a foundation wall | Generally no |
| Groundwater in a basement after rain | Generally no, and not flood-covered either without a flood policy |
| Rising river or storm surge | No, requires flood insurance |
| Sewer or drain backs up | No, needs an endorsement |
| Sump pump fails or is overwhelmed | No, needs an endorsement |
| Roof leaks from age and wear | No, maintenance |
| Mold following a covered water loss | Sometimes, usually with a low sublimit |
| Mold from a long-term leak | Generally no |
Coverage always depends on your specific policy language, so treat this as orientation rather than an answer.
The frozen pipe conditions
Frozen pipes are covered in most policies, but with conditions attached, and this is where winter claims go wrong.
Policies commonly require you to have used reasonable care to maintain heat in the building, or to have shut off the water supply and drained the systems if the home was vacant or unoccupied. If the insurer determines you left a home unheated through a freeze without taking those steps, the resulting damage may not be covered.
Practical measures that also happen to be what policies expect:
- Keep the heat on at a reasonable minimum, even when away
- Detach garden hoses before freezing weather and winterize irrigation
- Let faucets on exterior walls drip during hard freezes
- Open cabinet doors under sinks on exterior walls to admit warm air
- Insulate pipes in unheated spaces such as crawlspaces, attics and garages
- If leaving for an extended period in winter, arrange for someone to check the property, or shut off and drain the water
If your home will be vacant for an extended period, tell your insurer. Extended vacancy can affect coverage generally, not only for freezing.
The two gaps that need an endorsement
These sit outside both the homeowners policy and flood insurance, which is why they catch so many people.
Sewer and drain backup. When the municipal sewer or your own drain lines back up into the house, a standard policy does not cover it. Neither does an NFIP flood policy. It requires a specific endorsement, commonly called water backup of sewers and drains.
Sump pump failure or overflow. Same position. A sump pump that fails, loses power, or is simply overwhelmed by volume is not a covered cause under a standard policy.
Both are usually available as an inexpensive endorsement, and both are among the most commonly recommended additions to a policy. Limits are typically modest and can often be increased. If you have a basement, ask about these by name.
You own the sewer lateral
A point that surprises homeowners regularly. The sewer lateral, the pipe running from your building to the municipal main, is generally the property owner's responsibility to maintain and repair, including in many jurisdictions the portion that runs under the street or public right of way.
A lateral cracked by roots or age can admit groundwater and contribute to a backup. Repairing it is typically not covered by a standard policy, though service line coverage is available as an endorsement from many insurers and addresses buried utility lines on your property. Municipal rules on lateral ownership vary, so check locally.
Mold
Mold is treated cautiously by insurers because it can be expensive and because it usually indicates an underlying moisture problem.
The general position: mold resulting from a covered water loss may be covered, frequently subject to a specific sublimit that is considerably lower than your dwelling limit. Mold resulting from an uncovered cause, from long-term humidity, or from a maintenance failure is generally excluded.
The practical implication is speed. Prompt drying after a water loss limits mold growth and keeps the claim within the covered event. Document the moisture, use professional drying where the loss is significant, and keep records.
Prevention that insurers notice
Some of these may also qualify for a discount, which varies by insurer and state.
- Automatic water shutoff devices that detect flow anomalies and close the supply
- Leak sensors near water heaters, washing machines, dishwashers and under sinks
- Replacing rubber washing machine hoses with braided stainless steel
- Replacing a water heater at the end of its service life rather than after it fails
- Sump pump with battery backup, since power outages and heavy rain arrive together
- Backwater valve on the sewer lateral, where appropriate
- Grading and gutters directing water away from the foundation
See insurance discounts worth asking about.
If it happens
Stop the source if you safely can, then mitigate, which is a policy duty, not just good sense. Extract standing water, start drying, remove wet materials. Keep receipts for emergency work.
Document before cleaning up. Photographs and video of the source and the extent.
Report promptly, and ask which deductible applies.
Do not discard damaged items until the adjuster has seen them or agreed otherwise.
Full sequence in filing a home insurance claim.
Questions for your agent
- Do I have water backup of sewers and drains coverage, and at what limit?
- Do I have service line coverage for the sewer lateral and other buried lines?
- What is my mold sublimit?
- What does my policy require of me regarding heat and vacancy in winter?
- Is my personal property in the basement covered on the same basis as the rest?
- Would a leak detection device qualify for a credit?
Related reading: what homeowners insurance covers, flood insurance and the NFIP, and condo insurance and the master policy, since water is the dominant condo claim.
Coverage, exclusions, endorsement availability, sublimits and policy conditions vary by insurer, by policy and by state, and your policy documents control. Municipal rules on sewer laterals vary locally. For your own property, speak with a licensed agent or your state's Department of Insurance. You can also request home insurance quotes and get connected with licensed providers in your area.