Of all the water losses our crews respond to, the ones that catch homeowners off guard are rarely the burst pipes. They are the sump pump that quit during a storm, or the sewer line that backed up into the basement. The damage is real, the cleanup is a hazardous-water job, and then the bill lands and the homeowner learns something they were never told: the policy they have been paying for either does not cover it, or covers it only up to a small number.
This guide explains why, how to check your own policy in a few minutes, and what to do about it.
Why a standard policy treats this differently
A standard homeowners policy is built around sudden, accidental water that comes from inside the plumbing system, like a supply line that breaks. Water that comes up through a drain, a floor drain, a sump pit, or a sewer line is treated as a separate category. On most policies it is excluded outright unless you have added an endorsement, usually called water backup, sewer and drain backup, or sump pump overflow coverage.
That endorsement is optional, it is inexpensive, and a surprising number of homeowners either never added it or do not know whether they did.
The part nobody reads: the sublimit
Even when the endorsement is in place, it almost never pays up to the full value of the house. It pays up to a sublimit, which is a separate cap that applies only to backup losses. Common sublimits we see on real claims are $5,000, $10,000, and $25,000, with $10,000 being by far the most frequent.
Here is why that matters. A basement backup that involves contaminated water requires extraction, anti-microbial treatment, protective equipment for the crew, structural drying with commercial dehumidifiers and air movers, and decontamination of every piece of equipment that touched the water. That work routinely runs well past $10,000 on a full basement. When it does, the carrier pays the sublimit and the difference belongs to the homeowner.
How to check your policy in five minutes
You do not need to read the whole policy. Open your declarations page, which is the summary at the front of the policy, and look for three things:
- An endorsement line with words like Water Backup, Sewer or Drain Backup, or Sump Pump Overflow. If it is not listed, you most likely do not have the coverage.
- The limit next to it. That number is your sublimit. If it says $5,000 and you have a finished basement, that is worth a conversation with your agent.
- Your deductible. Backup coverage is subject to your regular deductible, so subtract it from the sublimit to see what the carrier would actually pay on a large loss.
If you cannot find it, call your agent and ask one direct question: "Do I have water backup coverage, and what is the limit?" Write the answer down with the date.
Sump pump failures, specifically
A sump pump is a mechanical device that runs the most exactly when the power is most likely to go out. The failures we see follow a few patterns: the pump burns out during an extended storm, the float switch sticks, the discharge line freezes, or the power fails and there is no battery backup. Some policies treat pump failure the same as a drain backup; a few carriers require the pump to have failed mechanically rather than simply been overwhelmed by volume. Read the endorsement language or ask your agent which applies to you.
What to do if you do not have enough coverage
- Add or raise the endorsement now. Raising a $5,000 sublimit to $25,000 typically costs a small amount per year. It is one of the cheapest coverage changes a homeowner can make.
- Install a battery backup pump. The number one cause of sump failure we see is a power outage during a storm.
- Have a pre-loss plan. Knowing who you will call and what your coverage is before the water arrives removes most of the panic from a bad night. Our SHIELD program does exactly this for commercial properties, and the same thinking applies to a home.
If it has already happened
Call us before you call anyone else, including the carrier if you are unsure whether you will file. Backup water is treated as Category 2 or Category 3 contamination and the clock matters; the longer it sits, the more material has to come out. Our team will document the loss, explain what the cleanup involves, and give you a clear number before the work starts. From there you can decide whether to file, using the guide on whether to file a claim or pay out of pocket.
You can request service online or call us any hour of the day. We answer the phone ourselves, and we have since 1974.
This guide is general information from a restoration contractor, not insurance advice. Coverage varies by carrier, state, and policy form. Confirm the details of your own policy with your agent.