Sewer Backup Caused by the City Main: Who Pays for the Basement Cleanup?
Sewage backed up because the city main was blocked? How to prove whose pipe it was, the city claim process and deadline, your insurance rider, and cleanup.
Your insurance pays first (if you have a water-backup endorsement), and the city pays only if you can show the blockage was in its main and the city was negligent in maintaining it. Cities don't reimburse automatically because sewage came from their line. So the practical order is: start the cleanup now, prove whose pipe it was, file a written notice of claim with the city quickly, and run the insurance claim in parallel. A homeowner in Davis County asked us this in the spring after a grease blockage in a city main backed sewage into several homes on one street. Here's how that plays out.
Sewage in the basement? Stay out of it and call 24/7 · (801) 948-2501.
This is general information from a Utah mitigation company, not legal advice. Deadlines for claims against a city are short and strict; talk to an attorney early.
Whose pipe was it: the city main or my lateral?
The line splits at the property line (or the main, depending on the city's ordinance):
- Your lateral runs from the house to the main. Roots, grease, wipes, a bellied section, a collapsed clay pipe: all yours to clear and repair.
- The city or sewer district's main runs under the street. A blockage there pushes flow back up the laterals of the lowest homes on the line.
A backup that hits several houses at once usually points to the main. A backup at one house usually points to that lateral. Usually, not always.
How do I find out for sure?
- Call the city or sewer district the same day and report the backup. Ask them to send a crew to check the main; they'll often jet or camera it and note what they found.
- Ask for the maintenance record for that section of main: when it was last cleaned and what the crew found. Many cities clean mains on a rotating schedule and can tell you the last date.
- Get your own camera inspection of the lateral from a plumber, with a written statement of where any blockage was and whether the lateral was clear to the main. Keep the video.
- Keep the plumber's invoice and the city's work order. Those two documents are the core of a claim against the city.
When the Davis County backup happened, the city said it had cleaned that section eight months earlier and told residents to contact their insurers while it determined the cause. Expect that answer. It isn't a refusal; it's where the process starts.
We've been on the other end of this. Keystone did the cleanup on a main-line backup in Pleasant Grove that pushed sewage into five units of a commercial office building, and who pays is still unresolved between the parties.
> "The city always wants someone else to pay for it, and everyone points the finger at everyone else. In our experience it usually does end up with the city, but it takes a long time, and the cleanup can't wait for it." > — Seth Saxton, WRT, AMRT, ASD, FSRT, OCT, Keystone Restoration (IICRC Certified Firm #70266523)
How do I make a claim against the city, and how long do I have?
Claims against a Utah city or sewer district go through the Governmental Immunity Act of Utah. The key points:
- The entity generally owes you only if it was negligent, not simply because the pipe was its pipe. A main that was cleaned on schedule and blocked anyway is a harder case than one that hadn't been serviced in years.
- You must file a written notice of claim with the entity. Under Utah Code § 63G-7-402, the claim is barred unless the notice is filed within one year after it arises. Many cities also have their own claim form; ask the clerk or risk manager for it the first week.
- Put the plumber's report, the city work order, photos and receipts with the notice.
One year sounds like a long time. It isn't, once you're also managing an insurance claim and a rebuild. File early. If the amount is significant, an attorney who handles claims against governmental entities is worth a consultation.
Does my homeowners insurance cover this?
Only with a water backup / sewer and drain backup endorsement. Standard homeowners policies exclude water that backs up through sewers or drains; the rider adds it, usually with a sublimit. The one we see most often on Utah policies is $10,000. Most Utah homeowners with basements have the rider; Keystone asks about it before starting work, and we routinely work within the sublimit. If the claim was denied for no rider, that situation is covered here.
If you have the rider, use it. The carrier pays the cleanup now, and it may pursue the city itself (subrogation) to recover what it paid. You pursue the city for what the carrier didn't cover: your deductible, anything above the sublimit, contents the policy excluded. If you have no rider, the cleanup is out of pocket while the city claim runs; Keystone finances the mitigation on denied claims with about 25% down.
Why can't the cleanup wait until someone admits fault?
Sewage is Category 3 water under the IICRC S500 standard: grossly contaminated. Porous materials it touched (carpet, pad, drywall, insulation, particle-board cabinets) are removed, not cleaned, and the longer they sit the further the contamination and mold spread. Waiting also hurts your claim: an insurer or a city can argue that part of the damage came from delay, not the backup. The safety and cleanup basics are in sewer backup in your basement: what to do and why Category 3 cleanup is different.
What should I keep for the claims?
- Photos and video of the water line, the drain it came from, and everything affected, before anything is removed
- The plumber's camera report and invoice
- The city's work order or email confirming what they found in the main
- The mitigation company's itemized invoice, drying log, photos and category of loss
- An inventory of ruined contents with photos
- Every receipt, including the tarp, the shop-vac and the hotel
When should I call a mitigation company?
As soon as the plumber has stopped the backup, or at the same time. Don't walk through it, don't run the HVAC, and don't try to clean porous materials yourself.
What's not included: Keystone Restoration does the sewage removal, tear-out, disinfection, drying and documentation. We don't clear or repair sewer lines (a plumber), and we can't file your claim against the city (you or an attorney). Rebuilding the basement is our sister company, Keystone BuildWorks.
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