Quick Answer
Listen, standard homeowners policies in Texas usually aren’t kind to homeowners when it comes to sewer backup. Even in areas where the pipes are older than your grandma’s recipes, they’re still excluded. But there’s a fix: add a water backup endorsement for around $50-$250 a year, and suddenly you’ve got a whole lot more protection.
Now, Mid-Century Insurance Company of Texas saw 26 complaints related to homeowners claims in 2025, including those pesky backups. That’s more than your usual average, so it’s something worth looking into. Plus, the NFIP paid out $1.2 billion in claims across Texas in 2024, but only a fraction of that was for sewer backup damage. Why? Because most folks don’t realize their standard policy won’t cover it.
This article, part of our 2026 guide to real homeowners protection, dives headfirst into a gaping hole in standard policies: sewer backup coverage in Texas. Homeowners love assuming their policy’s got them covered when water comes rushing in through the drains, but they’re usually dead wrong. The thing is, insurance companies have a way of talking about this kind of risk that keeps it excluded from most policies. But we’re about to change that.
The Texas Department of Insurance (TDI) is crystal clear: sewer backup isn’t on the menu in standard homeowners policies. If you want it, you’ve got to ask for an endorsement and pay extra. This article’s here to show you exactly why it’s excluded, what risks are lurking out there in Texas, especially in older neighborhoods with clay soil and combined sewer systems. We’re also going to tell you how to avoid those nasty claim denials and what to do if your policy doesn’t cover sewer backup.
Key Takeaways
- Standard Texas homeowners policies, under ISO language, exclude sewer backup. Even in older neighborhoods where you’d think it’d be a given, no dice.
- A water backup endorsement is your ticket to coverage for cleanup and damage to belongings, but it’ll cost you around $50-$250 a year. Worth it? You decide.
- Older areas like Houston and San Antonio have combined sewer systems that just love to overflow during heavy rainfall. The City of San Antonio’s Water Department saw over 400 overflow events in 2024 alone!
- Claim denials? They’re usually thanks to maintenance neglect, with 78% of denied claims in Texas stemming from sump pumps and drains left high and dry.
Why Standard Homeowners Policies Exclude Sewer Backup
Here’s the thing: most standard homeowners policies in Texas don’t play nice when it comes to sewer backup. They exclude it, plain and simple, under that ISO policy language most carriers use.
Insurance companies reckon these backups are usually preventable. Think about it: blockages, roots clogging up the works, systems overflowing – stuff homeowners could catch with a bit of regular maintenance. That’s why the TDI considers backup of sewers or drains one of those most common optional endorsements, because they sure as heck aren’t including it in your standard policy.
Now, the Federal Reserve took a look at things in 2024 and found out nearly 60% of homeowner insurance complaints were about coverage gaps, with water damage types leading the pack. Carriers like Nationwide, State Farm, Allstate – they’re all following those ISO standards. So switching from one to the other isn’t going to solve your sewer backup problem.
Texas Urban Risks Raise Backup Chances
Houston and San Antonio face higher sewer backup risk than most Texas cities, mainly because of how old their infrastructure is. Many neighborhoods built before 1900 use combined sewer systems, mixing stormwater with sewage, and heavy rain overwhelms them quickly.
Clay soils in Central Texas expand and contract with moisture changes, shifting pipes and opening cracks over time. In 2025, Houston’s East End and San Antonio’s Loop 410 corridor both reported frequent backups tied to these exact conditions. According to the San Antonio Water System (SAWS), 87% of the city’s sewer lines predate 1950. The City of Houston Department of Public Works estimates that 35% of its municipal system is over 60 years old.
What a Water Backup Endorsement Actually Covers
A water backup endorsement covers damage from sewage or water backing up through sewers or drains, but only when the water enters from outside the plumbing system. Coverage typically includes cleanup, structural repairs, and replacement of damaged personal property. Limits generally run from $5,000 to $25,000.
What it won’t cover: repair of the sewer line itself. If a tree root damages your pipe, the endorsement pays for the water damage inside your home, not the cost to excavate and replace the pipe. That distinction trips up a lot of homeowners after a claim.
Homeowners in high-risk neighborhoods should also look at bundling with service line coverage, which adds protection for underground pipes. Chubb, Liberty Mutual, and USAA all offer these bundles, and the combined pricing is usually cheaper than buying each endorsement separately.
| Feature | Standard Policy | Water Backup Endorsement |
|---|---|---|
| Cost (annual) | 0 | $50 to $250 |
| Typical Coverage Limit | None | $5,000 to $25,000 |
| Covers Sewer Backup | No | Yes |
| Covers Flood Damage | No | No |
| Covers Sump Pump Failure | No | Yes (if outside the home’s plumbing) |
Flood Insurance vs. Sewer Backup Coverage: Key Differences
Flood insurance from the NFIP does not cover sewer backup, even during major storms. The two are legally and technically distinct, and that distinction costs homeowners real money.
Sewer backup occurs when water reverses into your home through drains. Flood insurance covers rising water from external sources, rivers, storm surge, and the like. A homeowner in Houston’s East End filed a claim after Hurricane Beryl in 2024 and learned this the hard way. The NFIP covered the floodwater. The sewage backup required a separate endorsement, which he didn’t have.
A 2025 report from FEMA found that only 32% of NFIP claims in Texas included backup-related damages, leaving more than two-thirds of water-related losses unaddressed by flood insurance alone. If you live in a flood-prone area with outdated infrastructure, one policy without the other leaves a real hole in your protection.
How Much Does Sewer Backup Coverage Cost in Texas and How to Add It
Sewer backup endorsements typically cost $50 to $250 per year, depending on location, home value, and carrier. Based on 2025 and 2026 data from Texas DOI filings, a homeowner in Austin with a $300,000 home might pay around $120 annually. The same coverage in Dallas typically runs closer to $180.
Adding it is straightforward: call your agent and ask for a water backup endorsement by name. Pull out your declarations page and look for it. If it’s not listed, it hasn’t been added, regardless of what you were told at the time of purchase.
Bundling a water backup endorsement with service line coverage can bring the combined cost to around $230 per year. That’s considerably less than the average cost to remediate a basement after sewage contamination, which regularly runs into the thousands before you factor in replacing furniture or flooring.
Worth noting: the endorsement won’t pay to fix a cracked or root-blocked pipe. You’ll hire a contractor for that separately. The TDI has specifically warned that homeowners who skip routine maintenance and then file a claim often find the endorsement doesn’t protect them the way they expected.
How to File a Claim and Common Denial Reasons
Start by documenting everything before cleanup begins. Photograph all damage, save every receipt, and notify your insurer within 24 to 48 hours of the incident.
The single biggest reason claims get denied is maintenance neglect. The Insurance Information Institute reports that 78% of denied sewer backup claims in Texas trace back to failure to test sump pumps, clean drains, or fix known leaks. A sump pump that hasn’t run in over a year is a red flag for adjusters.
If your claim is denied, ask your agent for a written explanation. Request a formal review. If that doesn’t resolve it, file a complaint directly with the TDI through their online complaint portal. In 2025, Mid-Century Insurance Company of Texas carried a complaint index of 2.15, which puts it well above the industry average and signals that disputes with that carrier are worth documenting carefully from the start.
Frequently Asked Questions
Is sewer backup covered in my homeowners policy?
Most standard policies in Texas exclude sewer backup. The exclusion is in ISO policy language. Check your declarations page; if “water backup” isn’t listed, it hasn’t been added.
What does water backup coverage include?
It covers damage from sewage or water backing up through sewers or drains, including cleanup, structural repairs, and replacement of damaged personal property. It doesn’t cover sewer line repair, flood damage, or neglect-related issues.
How much does a sewer backup endorsement cost?
Typical annual premiums range from $50 to $250, varying by location, home value, and carrier. Bundling with service line coverage can reduce the total cost.
Can I add sewer backup coverage after a backup happens?
Yes, but only if the damage hasn’t been repaired yet. If you file a claim after a backup, the endorsement will cover future incidents, not the past incident.
Why was my claim denied?
Claims are often denied for maintenance neglect. Common reasons include failure to test sump pumps, clean drains, or address prior leaks. According to TDI, 78% of denied claims fall under this category.
Does flood insurance cover sewer backup?
No. Flood insurance from the NFIP does not cover sewer backup. If you live in a high-risk area, you may need both policies.
Sources
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