What a standard home policy does not cover

Water gets into a house four different ways, and a standard homeowners policy treats all four differently.

A burst pipe is usually covered. A roof torn open by wind, letting rain in, is usually covered. Groundwater rising into the basement is not. Sewage backing up the same drain is also not — and it is not covered by flood insurance either.

Same room, same water, same ruined floor. Four answers. This is the part of home insurance that produces the most anger, and almost all of it is avoidable by knowing the list in advance.

Covered perils are a list, not a principle

The III sets out the standard list of covered causes: fire or lightning, windstorm or hail, explosion, riot or civil commotion, damage caused by aircraft, damage caused by vehicles, smoke, vandalism or malicious mischief, theft, and volcanic eruption.

Source: Insurance Information Institute — Which disasters are covered by homeowners insurance? · accessed 2026-08-04

The important structural point is that this is a list rather than a rule. There is no general principle that says “bad things that damage houses are covered.” There is an enumeration, and a claim either fits it or does not.

Some policy forms are broader and cover any cause that is not specifically excluded, which is a genuinely different structure — but even then, the exclusions below are among the things excluded.

Flood

“Flood damage is excluded under standard homeowners and renters insurance policies. Separate flood insurance coverage, however, is available.”

That is the whole rule, and it has no exceptions worth relying on. It applies whether you are in a mapped high-risk area or not, and it applies whether the water came from a river, a storm surge, or rainfall that simply had nowhere to go.

The NAIC frames the boundary usefully: “water damage from leaky pipes, siding and roofs is likely covered, but ground-water damage from rain, run-off or snow-melt is not.”

Source: National Association of Insurance Commissioners — Homeowners Insurance · accessed 2026-08-04

Direction of travel is the test. Water arriving from above, through the building envelope, is usually a homeowners matter. Water arriving from the ground up is usually a flood matter.

Earth movement

“Earthquake coverage is available from most insurance companies as a separate policy or an endorsement to your homeowners or renters policy.”

Available, not included. And the exclusion is generally broader than the word “earthquake” suggests — sinkholes, landslides, mudflow and subsidence often sit in the same excluded category, which matters in a lot of places that have never had a notable earthquake.

The NAIC’s note is worth repeating: “damage from earth-movement is more common than you think and may not be included in your policy.”

Water that comes back up the pipe

This is the gap people fall into hardest, because it sits between two policies and is covered by neither.

The III is direct: “Sewer backups are not covered under a typical homeowners insurance policy, nor are they covered by flood insurance. This type of coverage must be purchased either as a separate product or as an endorsement.”

Neither policy. Both refuse, and each for a coherent reason — it is not a listed peril on the home policy, and it is not a flood. The endorsement that fixes it is usually inexpensive and frequently not discussed.

Maintenance and wear

The last exclusion is the one nobody argues with in principle and everybody argues with in practice.

“It is your responsibility to maintain your home and take reasonable precautions to protect your home from damage. Your insurance policy will not cover damage due to lack of maintenance.”

Insurance covers sudden and accidental events. It does not cover deterioration, and it does not cover the consequences of postponing a repair. A roof that has reached the end of its life is a maintenance matter, not a claim — and a leak that follows from it is likely to be treated the same way.

The line between “sudden” and “gradual” is where most denied claims live, and it is worth understanding before a claim rather than during one.

The principle underneath all four

Read the exclusions together and a single logic emerges: a home policy covers events that are sudden and accidental, and declines things that are gradual, expected, or systemic.

Fire is sudden. A roof wearing out is gradual. A pipe bursting is accidental. A pipe that has been weeping for two years is a maintenance matter that became visible.

Flood and earth movement are excluded on a related but distinct basis. They are not gradual — they are catastrophic and correlated. When they happen, they damage very many properties in a defined area simultaneously, which breaks the arithmetic that ordinary insurance relies on. Those perils are therefore priced and pooled separately, which is precisely why they exist as separate products rather than as gaps nobody bothered to fill.

Understanding that logic is more useful than memorising the list, because it lets you predict how a novel situation will be treated. Ask two questions of any loss: was it sudden, and was it the kind of event that hits one house or ten thousand.

The exclusion nobody mentions: building codes

There is a fifth gap worth knowing about, and it appears only after a large loss.

If a substantial part of your home is destroyed, rebuilding it generally has to meet current building codes rather than the codes in force when it was built. On an older property that can mean electrical, plumbing, insulation, structural or elevation requirements that did not previously apply.

A standard policy pays to replace what was there. It does not automatically pay the additional cost of bringing the replacement up to current code, and on an older house that difference can be substantial.

Coverage for it exists — usually as an ordinance or law endorsement — and it is frequently either absent or present at a small default amount. It is a good question to ask precisely because it never comes up in an ordinary year and matters enormously in the one year it does.

What to do

Ask your agent one question about each of the four: do I have it, what would it cost to add, and what would it not cover even then.

Flood and earth movement are separate purchases and a decision either way is defensible depending on where you live. Sewer backup is usually an inexpensive endorsement and is the one most often missed entirely.

Whatever you decide, get the declined items recorded in writing. An agent working to the Client First standards will document any recommended coverage you turn down — including flood and earthquake, whether or not the agency can place them.