By Double J Liner Repair · Sewer Repair · Published 2026-10-23
Sewer lines are installed with a slight downward slope so gravity carries waste toward the street. A belly is a section where the pipe has sagged, creating a low spot where water and solids collect instead of flowing through.
Bellies are common, especially in areas with shifting soil. Here is what they mean for your line.
Most bellies form when the soil under the pipe settles or shifts. In the San Antonio area, expansive clay that shrinks and swells is a frequent cause. Poor bedding under the pipe during original installation, or soil washed away by a leak, can also cause a section to sink.
A camera inspection reveals a belly as a section where the camera lens goes underwater or where standing water is visible. The technician notes the distance and how much water is held, which indicates how severe the sag is.
A liner follows the shape of the host pipe, so it will not change the slope. That means lining does not remove a belly. A minor belly in an otherwise damaged pipe can sometimes be lined to address cracks and roots, and the line may function well afterward.
A severe belly that holds a lot of water usually needs to be corrected by excavating that section and re-bedding or replacing the pipe at the proper slope. The rest of the line can often still be lined.
Because bellies affect what repair will work, a careful camera inspection is essential. We will tell you honestly whether lining will solve your problem or whether a spot repair is needed first.
Minor bellies are common and do not always cause trouble. Severe bellies that hold significant water often cause recurring clogs.
No. A liner follows the existing pipe shape, so it does not correct the slope. Severe bellies usually need a spot excavation.
Yes. Many repairs combine a short spot repair with lining for the rest of the line.
Double J Liner Repair offers sewer camera inspections and free estimates on no-dig sewer repair in San Antonio, backed by a 10-year warranty. Learn more about sewer repair or read more sewer and pipe repair guides.
Double J Liner Repair · 1800 NE Interstate 410 Loop #216, San Antonio, TX 78217 · Phone: (210) 802-2018 · Email: Info@doublejlinerrepair.com
Hours: Monday–Friday 8:00 AM–6:00 PM, Saturday 9:00 AM–2:00 PM, Sunday closed.