Sewer backup: what to do first
Stop putting water down any drain. That means no flushing, no dishwasher, no washing machine, no showers. Every gallon you add has to come out somewhere, and the lowest opening in the house is usually a tub, shower or basement floor drain.
Then protect people. Sewage carries bacteria and viruses, so keep children and pets away from the wet area and do not walk through it barefoot. Wear rubber gloves and boots if you have to move things, and wash your hands well afterward. Do not mix bleach or any cleaning chemical into the water in an effort to disinfect it. Bleach and some drain products react badly with each other and with waste.
Open a window if there is a sewer smell. A rotten-egg smell can be sewer gas or natural gas, and the two are easy to confuse. If you are not sure which it is, leave the building first, then call 911 and the gas utility from a safe distance.
What a main sewer line is
The main sewer line is the large pipe, commonly 4 inches across, that collects all the branch drains in the house and carries them out to the public sewer or a private system. Cleaning it is different from clearing one sink. A sink clog is in a branch with a single fixture. A main line clog sits downstream of all of them, so the problem shows up everywhere.
The main line has a cleanout, a capped pipe that usually rises out of the ground near the house or sits in a wall, crawl space or garage. It exists so a plumber can feed a cable or camera into the line without taking apart a toilet. If you have a cleanout, a plumber can start work quickly. If you do not, access is part of the job.
Fixture drains are covered on the page about clearing sink, tub and toilet drains. This page is about the line that all those fixtures share.
Signs the main line is clogged
Look at the pattern, not any single drain.
- Toilets, tubs and sinks all drain slowly at the same time
- Water backs up in a tub or shower when you flush or run the washer
- A floor drain or the lowest tub gurgles or bubbles
- Toilets rise and fall, or air burps up through traps
- A strong sewer odour inside or near the cleanout
- Wet or soft ground and a smell outside, near the line
One slow sink points to a branch. Several fixtures at once, especially the lowest ones, point to the main. If a neighbor has the same trouble or sewage is rising from a manhole in the street, the blockage may be in the public main, and your utility is the first call.
Cleaning methods and what each does
A drum machine feeds a long, flexible steel cable on a spinning drum into the line. The cable carries a cutting head matched to the blockage. A spear or drop head breaks through a soft plug. A blade or chain head scrapes grease and scale off the wall. A root cutter shears roots that have grown into joints.
Hydro jetting uses a hose and a nozzle that sprays water in all directions, scouring the pipe wall. It does more than open a hole. It washes out grease, scale and sludge that a cable leaves behind, which is why it suits recurring clogs. The high pressure water cleaning page explains how it works and when not to use it.
The choice depends on the blockage and the pipe. A cable is often quicker and gentler on older pipe. A jet cleans better when the cause is buildup along the wall. Many main line jobs use both, a cable to open the plug and a jet to clean afterward.
How the visit works
Locate the cleanout
The plumber finds it, removes the cap slowly in case there is pressure behind it and checks the water level inside.
Look with the camera
A small camera on a flexible rod goes in first on a hard backup, or after the first pass, to see what the blockage is and what the pipe looks like.
Clear the line
The plumber runs the cable or jet in steps until water flows freely, pulling debris out where possible instead of pushing it further down.
Camera again
A second pass with the camera confirms the pipe is open, shows the wall after cleaning and can reveal damage that the clog was hiding.
Many plumbers record or describe what the camera shows. Ask what was seen. A good report names the blockage, the location and the condition of the pipe, and it tells you whether the line needs more than cleaning.
Why roots come back and what to do
Roots look for water, and a sewer line is a constant source of moisture and nutrients. A hairline gap at a joint lets a few root hairs in. They grow, thicken and catch paper and waste, and the line clogs again. A cutter removes the roots, but it does not close the gap they came through, so they return.
How soon depends on the tree, the size of the gap and how much the pipe leaks. Some lines stay clear for years after a good cutting. Others need cleaning every year or two. A camera check tells you which situation you are in.
There are three sensible responses. Schedule cleaning at an interval the plumber recommends, so roots never get big enough to cause a backup. Repair or replace the damaged section, which is the fix that actually stops the cycle. Or, in some cases, remove or move a nearby tree. A foaming root treatment is sold in some places, and a plumber can say whether it suits your pipe.
When cleaning is not enough
A cleaning job opens a pipe. It cannot repair one. If the camera shows a collapsed section, a joint that has dropped out of line, a belly where waste pools or a crack that lets soil in, the line needs a repair or replacement. Cleaning a broken pipe over and over wastes money and may make the damage worse.
Typical signs of a damaged pipe are a clog that returns within weeks, a cable that stops at the same spot every time and a camera that sees a dent or a void. In those cases the next step is covered under sewer line repair, and you decide with the price in hand.
A planned look at the pipe, with no backup yet, is a separate service, described under sewer inspection.
| What the plumber finds | What it usually means | Typical fix |
|---|---|---|
| Soft plug of paper and waste | A one-time blockage, often from wipes or too much paper | Cable the line, flush to confirm |
| Grease and scale coating the wall | Years of buildup narrowing the pipe | Hydro jet the line, then camera check |
| Roots at a joint | A small gap that roots are using | Cut roots, schedule a repeat cleaning or repair the joint |
| Pipe offset, sagging or collapsed | Physical damage to the pipe | Repair or replace the section |
| Clean pipe but still backing up | The blockage may be downstream in the public sewer | Call your utility, camera shows the line is clear |
Sewage backing up in the house?
Call the 24/7 line now. A licensed plumber is dispatched, and you get a clear price before work starts.
Who owns which part of the sewer
Generally the homeowner owns the pipe from the house out to the connection with the public main, and the utility owns the main in the street. Where exactly the line changes hands varies, so ask your utility if the answer affects who pays.
In Cibolo, sewer billing changed in November 2025. According to the City of Cibolo, it no longer bills sewer, and Green Valley Special Utility District (GVSUD) adds the sewer charge. GVSUD lists an emergency line for suspected sewer clogs at (830) 914-2331. If several neighbors are backing up, or a manhole is overflowing, call that line. If only your house is affected, a plumber can use the camera to show whether your line is clear.
The cleanout is also a useful clue for the plumber. If it is full of water, the blockage is downstream of it, and if it is dry while the house backs up, the blockage sits between the house and the cleanout. When the line is backing up, leave the cleanout to the plumber, since water under pressure can spray.
Sewage cleanup is a separate trade
We clear the line. We do not remove contaminated carpet, disinfect floors or treat affected drywall. That is cleanup and restoration work, and it uses protective gear, extraction and drying equipment that a plumbing visit does not.
Call your insurer and a restoration company once the backup is stopped. Sewer backup is often covered only by a separate endorsement on a homeowners policy, so ask before you assume either way. Photograph the damage first, and keep the plumber's invoice and camera findings, because they help show what happened.
What affects the price of sewer line cleaning
Access
A cleanout makes the work straightforward. If the plumber has to pull a toilet or cut in an access point, the job changes.
You get a clear price before work starts, and if the camera shows damage that changes the job, you hear that before more is done.
Sewer lines in Cibolo, TX
A main line backup in Cibolo is first a question of whose pipe it is. The City of Cibolo enforces the 2021 International Plumbing Code (IPC), which covers how cleanouts, traps and vents are installed. If your home has no accessible cleanout, adding one is a code-minded repair, and permit rules vary, so ask the City of Cibolo building department.
Housing in Cibolo grew quickly, from 3,035 people in 2000 to 32,276 in the 2020 Census. Much of the housing is relatively recent, but age alone does not tell you the condition of a line, so a camera tells you more than a guess. We do not know the pipe material in your house, and a plumber will confirm it on camera.
We take main line calls in Universal City and nearby towns as well, and the steps above do not change.
Common questions about sewer line cleaning
Backups do not keep office hours, and neither does the phone, which is answered every night and weekend while a licensed plumber is dispatched with same-day appointments when available. Expect no promised arrival time, but do expect questions about your cleanout, the capped pipe outside near the house, so locate it and clear space around it. Do not flush or run the washing machine. You get a clear price before the cable or camera goes in.
A small backup in one room can be managed if people stay out of the wet area, wear gloves and wash up. For a larger spill, children, older adults and anyone with a weak immune system should stay elsewhere until the plumber and cleanup are done. Ask the dispatcher if you are unsure.
No. They rarely open a full blockage, they can damage the pipe and they leave hazardous water behind. Tell the plumber if you already used a product.
If every drain backs up and the neighbors are fine, the cause is probably in your line. If neighbors are also affected, call the utility. In Cibolo, GVSUD lists (830) 914-2331 for suspected sewer clogs. Smaller issues such as a single sink are explained in clearing a clogged drain.
It can, particularly when roots or grease are the cause. A camera check shows whether the pipe is sound. If it is, scheduled cleaning keeps the line clear, and if it is damaged, a repair addresses the cause.
There is no fixed schedule. A line with no history of trouble may need nothing. A line with roots or grease may need cleaning every year or two. The plumber can suggest an interval after seeing the pipe on camera.