The cheap add-on
Sewer backup is excluded as standard, and the fix costs about a tank of fuel.
A standard homeowners policy excludes water that backs up through sewers, drains or a sump. Cover for it is an endorsement bought separately, usually for a modest annual premium and a limit well below the building sum insured. Most owners were offered it once, at the point of sale, and do not remember the answer.
(844) 595-2218 Call about water damageConnects you with an independent contractor about new work. Calls may be recorded.
Why the exclusion exists at all
Backup is a maintenance-adjacent risk: tree roots, grease, an ageing lateral, a municipal main that surcharges in heavy rain. Insurers separate it from accidental escape of water because its frequency depends on the condition of a system rather than on an unforeseeable event, and price it accordingly.
That is also why the endorsement carries its own limit rather than the full building sum. A five or ten thousand dollar limit is common, and a finished basement will exhaust it quickly.
What the endorsement typically answers for
Water that entered through a drain, a sewer connection or an overflowing sump, and the damage it did inside. It generally does not answer for the blockage itself, for the repair of the lateral, or for damage caused by flood water that entered the system from outside, which remains a flood question.
Read the limit as well as the presence of cover. Owners who find they have the endorsement often find the limit is smaller than the job.
Finding out today, in two minutes
Open your Declarations page and look for a line naming water backup, sump overflow or sewer backup, usually among the endorsements with its own limit. If it is not there, you do not have it, and adding it now will not answer for water already in the house.
Where a municipal sewer caused the backup there may be a separate claim against the authority. Those have short notice deadlines that run from the date of the incident, so the time to ask is this week rather than after the repairs.
Who this reaches, and how
Backup crosses property lines more often than any other water event.
- 01You own and live here. Check the Declarations page for the endorsement before you agree scope with anyone. The limit decides what you can afford to have done.
- 02You own it and rent it out. Sewage in a let property is a habitability question immediately, and the clock starts when the tenant tells you. Add the endorsement to every property you own if it is not there.
- 03You live in a flat or condo. Your endorsement and the association policy cover different parts of the same building, and neither party usually knows where the line falls until it is tested. Find out which one names interior finishes before you need the answer.
- 04You rent here. The drains are the owner responsibility. Your own belongings need renters insurance, and backup is excluded there too without the same endorsement.
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What to ask before you agree to anything
Ask these of whoever turns up. A contractor who answers them plainly is the one you want; a contractor who will not is telling you something.
- 01Are you treating this as contaminated water, and what does that change about scope?
- 02What is coming out, and how far above the water line are you cutting?
- 03How are you containing the affected rooms while you work?
- 04What are you doing about odour once the material is gone?
- 05Can you itemise this to a limit, since my endorsement caps out?
- 06What licence covers contaminated water work here, and what is your number?
Have this ready before you call
Three facts move the first minute past the formalities: what happened, when it started, and whether water is still moving. These add the detail that decides what gets loaded on the van.
- Whether your Declarations page shows a water backup endorsement and its limit
- Which fixtures backed up and whether it happened in heavy rain
- Whether neighbours had the same thing at the same time
- Whether the basement is finished and how deep the water got
- The name of your water authority, if a municipal main is involved
- Whether anyone in the household is medically vulnerable
Connects you with an independent contractor about new work. Calls may be recorded.
Where these figures come from
Every number on this page is published by someone other than us, and each link goes to their own text rather than to a summary of it.