In a sewer backup, SAWS maintains the lateral only from the main up to your property line. Everything from the property line into the house — the yard piping — is yours. Report a backup to SAWS at 210-704-SAWS (7297), open 24/7. If a licensed plumber locates the blockage past your property line and marks it with a green paint “X”, SAWS may reimburse the locating charge.
- The property line is the boundary. SAWS maintains the lateral from the main up to it; the yard piping from there into the house is yours.
- Call SAWS first at 210-704-SAWS (7297) — staffed 24 hours a day, 7 days a week. Reporting the backup costs nothing and starts the record.
- If a licensed plumber locates the blockage past your property line and marks it with a green paint “X”, SAWS may reimburse the locating charge. No X, no reimbursement.
When a sewer backup comes up through a shower drain, the first question is how to stop it and the second is who pays. Getting the second right in the first hour is worth real money, because the evidence that decides it sits in a pipe that is about to be cleared — and once the blockage is gone, so is the proof of where it was.
Who pays for a sewer backup is also the single thing San Antonio homeowners most reliably get backwards. People assume the city owns everything past the house wall, or that everything on their deed is theirs including the pipe under the sidewalk. Neither is right here, and it comes up constantly in local homeowner forums — usually after somebody has already paid for work they need not have.
Where the Boundary Actually Falls
SAWS maintains the wastewater lateral running from the public main up to your property line. You are responsible for the yard piping, which runs from that property line to the building drain inside your home. That is the split, and it is worth pausing on, because in a great many American cities the homeowner owns the entire lateral all the way to the main, including the portion buried under the street. San Antonio does not work that way. The portion in the right-of-way is the utility’s to maintain.
What that means in a sewer backup is that a blockage twenty feet from your house is almost certainly yours, and a blockage under the curb is almost certainly not. The hard part is that from inside a flooded bathroom, those two scenarios look and smell identical. The only way to tell them apart is to put a camera and a locator in the line and find out where the obstruction physically sits relative to your property line.
Sewer Backup: What to Do in the First Hour
The order of these sewer backup steps matters more than people expect, because two of them preserve your ability to be reimbursed and one protects your house. If sewage is actively rising while you read this, treat the sewer backup as an emergency plumbing call and work the list while you wait.
- Stop putting water into the system.No laundry, no dishwasher, no showers, and go easy on flushing. Every gallon you send down is a gallon that has to go somewhere, and right now it is coming back up at the lowest fixture in the house.
- Call SAWS at 210-704-SAWS (7297).That line is staffed 24 hours a day, 7 days a week. Reporting the sewer backup gets a crew dispatched to inspect the main, and it creates a timestamped record that you reported it — which matters later if there is any question about the sequence of events.
- Call a licensed plumber and say the words “locate and camera.”Not just “clear my drain.” SAWS instructs homeowners to have a licensed plumber televise the line and clear the blockage on the customer’s side. If the plumber simply cables it open without locating it first, the evidence is gone.
- Photograph everything before cleanup starts.Wide shots and close shots, with timestamps on. Insurance and SAWS both work from documentation, and memory is not documentation.
- Have the plumber mark the obstruction with green paint.This is the step almost nobody knows about, and it is covered in detail below. Without it, a reimbursement claim has no anchor.
The instinct in a sewer backup is to get it cleared as fast as possible and sort out the money later. That instinct is what forfeits reimbursement. Once a cable has been driven through the blockage, nobody can prove where it was, and a claim that the obstruction was in the right-of-way becomes an assertion rather than a documented fact. Locate first, then clear. It adds a short delay and it is the whole ballgame.
The Green X, and Why It Decides Who Pays
SAWS sets out a specific procedure for a plumber working a sewer backup that turns out not to be the homeowner’s problem, and it has three parts. The plumber electronically locates the lateral, marks the location of the obstruction or defect on the ground with green paint in an “X” marking, and then contacts the SAWS Emergency Operations Center on that same 210-704-SAWS number.
The logic is straightforward once you see it.
A camera tells you there is a break or a blockage and roughly how far down the line it sits. A locator tells you where that point is in the real world, standing in your yard. The painted X converts a measurement into a physical mark a SAWS crew can walk up to and verify. If that X lands past your property line, the reimbursement conversation becomes possible. If it lands in your yard, at least you now know exactly where to dig.
This is worth being direct about: not every plumber in this market does it by default. Plenty will clear a line competently and never mention locating or marking, because their job as they understand it is to restore flow. You are entitled to ask for it specifically. When we run a sewer backup call, locating comes before clearing on anything that might sit past the property line, and if the X lands on the SAWS side we help you document it. That is part of what our sewer line repair work and our main line clearing are meant to include.
The homeowners who end up out of pocket on a right-of-way sewer backup are almost never the ones who did something wrong. They are the ones who called whoever could come fastest at nine at night, got the line opened, felt enormous relief, and only thought about who should have paid for it a week later when the invoice cleared. By then there is nothing to locate. The window for protecting yourself is the hour before the cable goes in, not the week after.
Sewer Backup Reimbursement: What SAWS Will and Will Not Cover
Expectations are where sewer backup claims go wrong, so it is worth being precise about the scope. The reimbursement is narrow and specific, and it is not a damage claim.
| Item | Covered? | Detail |
|---|---|---|
| Electronically locating the obstruction | Yes | Limited to normal and customary plumbing charges for the locate. |
| Clearing or repairing the SAWS-side line | Yes | SAWS clears and repairs its own portion of the lateral. |
| Work on your side of the property line | No | Yard piping is the customer’s to maintain and pay for. |
| Installing a new cleanout | No | Treated as a property improvement, not a repair. |
| Damaged flooring, drywall, contents | No | SAWS does not pay for repair or replacement of damaged property. |
Scope per SAWS. Reimbursement is not automatic — the locate has to be documented and the blockage has to actually fall beyond your property, in the right-of-way, street, alley or easement.
The line that catches people out is the cleanout. If your house has no accessible exterior cleanout, a plumber may well need to install one to get into the line at all, and that cost lands on you even when the blockage itself turns out to be SAWS’s. It is frustrating and it is also worth doing, because a house without a cleanout will face the same sewer backup every single time, usually at a worse hour.
On most San Antonio homes the cleanout is a capped pipe at ground level near the foundation or along a side yard. If you cannot locate one on a calm afternoon, that is itself worth knowing before an emergency.
The property damage exclusion is the other one. Sewer backup damage to your home is an insurance question, not a utility question, and many standard homeowner policies exclude it unless a specific sewer backup endorsement was added. It is worth ten minutes with your policy now rather than in the middle of a claim.
Help for Income-Qualified Homeowners
SAWS runs an affordability arm called Uplift, and two of its programs matter here. Plumbers to People covers qualifying interior plumbing repairs, and Laterals to People addresses failing sewer laterals for homeowners who cannot fund the repair themselves. These are real programs with real budgets, and they are consistently under-claimed because most people have never heard of them.
For Laterals to People, SAWS states that an applicant must provide proof of current income annually, must be the homeowner and current occupant, and must be a SAWS water and sewer customer — water-only customers are not eligible. Uplift’s general eligibility criteria also include a cap on home value of $300,000, so that is worth asking about directly when you apply rather than assuming either way. The number to start with is 210-233-CARE (2273).
If a plumber has told you your lateral needs replacing and the number is out of reach, call SAWS Uplift at 210-233-CARE before you borrow against the house or let the problem sit. A failing lateral does not improve with time, and an untreated sewage problem becomes a health issue and eventually a code issue. Asking costs nothing.
Keeping Your Side of the Line Out of Trouble
Since the yard piping is yours, it is worth knowing what actually causes a sewer backup on your side. Three things do most of the damage in this city, and all three are manageable.
Roots are the first. The U.S. EPA lists tree roots entering through defects or openings in a line among the standard causes of blockages. Live oaks and pecans are the usual culprits here, and their roots travel well beyond the spread of the canopy. San Antonio’s mature live oaks and pecans supply plenty of pressure on any joint that has opened up. Grease is the second, and SAWS is blunt about how much of the problem it represents locally.
The third is the soil itself — the expansive clay across much of the city moves seasonally and works at buried joints over decades, which is why older laterals here fail at connections rather than mid-length.
The practical protection is knowing the condition of your own line before it fails, which is what a camera inspection and drain cleaning visit is for. One camera inspection tells you the material, whether roots are present and whether any joints have separated, and it converts an unknown into a plan.
If you are weighing whether to clean or repair a line that keeps giving trouble, we walk through that decision in sewer line problems and what repair costs, and the method question is covered in hydro jetting versus snaking. If your drains have been backing up repeatedly rather than once, the reasons are usually specific and findable — that is the subject of why a drain keeps clogging after it has been cleared. For what any of this typically costs, see our San Antonio drain cleaning cost breakdown and our approach to quoting.
Frequently Asked Questions
Is SAWS or the homeowner responsible for a sewer blockage?
It depends entirely on which side of your property line the blockage sits. SAWS maintains the lateral from the public main up to the property line. The yard piping from that line into your house is yours. Because the two look identical from inside the house, the only way to settle it is to electronically locate the obstruction.
What is the green X the plumber paints on the ground?
It is a SAWS requirement, not a plumber’s habit. After electronically locating the lateral, the plumber marks the obstruction or defect on the ground with green paint in an X, then calls the SAWS Emergency Operations Center. That mark lets a SAWS crew verify the location and is what a reimbursement claim is anchored to.
Will SAWS pay to replace my carpet after a sewer backup?
No. SAWS states it will not pay for repair or replacement of damaged property. Reimbursement covers normal and customary charges for electronically locating a blockage that turns out to be beyond your property. Damage to your home is a homeowners insurance question, and many policies need a specific sewer backup endorsement to cover it.
Do I need a cleanout, and will SAWS pay for one?
You want one, and no, SAWS treats it as a property improvement rather than a covered repair. A cleanout gives a plumber direct access to the main line without pulling a toilet or working through a roof vent. Homes without one pay more in labour on every single backup, so it usually pays for itself.
Who do I call first, SAWS or a plumber?
SAWS first, at 210-704-SAWS (7297), which is answered around the clock. It costs nothing, dispatches a crew to check the main, and timestamps your sewer backup report. Then call a licensed plumber and ask specifically for a locate and camera rather than just a clearing, so the evidence survives.
Is there help if I cannot afford to repair my sewer lateral?
Yes. SAWS Uplift runs Laterals to People for failing sewer laterals and Plumbers to People for qualifying interior repairs. Laterals to People requires annual proof of income, that you are the homeowner and current occupant, and that you are a SAWS water and sewer customer. Start at 210-233-CARE (2273).
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Sewer Backup Right Now? Locate Before You Clear.
We camera and electronically locate the blockage before we open the line, mark it to SAWS specification if it falls past your property, and tell you plainly whose problem it is.
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- SAWS — Plumbing Backed Up? — the responsibility split, the 210-704-SAWS 24/7 line, the green paint “X” procedure, and what is and is not reimbursed.
- SAWS Uplift — Helping Neighbors in Need — Laterals to People and Plumbers to People eligibility, and the 210-233-CARE line.
- U.S. EPA — Sanitary Sewer Overflow Frequent Questions — roots entering through defects, and grease among the standard causes of blockages.
- SAWS — Grease — the Scrape, Pour, Wipe guidance for keeping fats and oils out of the lateral.
- Texas State Board of Plumbing Examiners — verifying that the plumber doing the locate is licensed.
