Houston · Harris County
Sewer Line Repair in Houston, TX
In Houston homes built before about 1980, the drain lines under the slab are usually cast iron, and after decades of corrosion many are cracked or worn through along the bottom. Recurring backups, sewer odors and sometimes foundation settling are the signs. A camera inspection and a hydrostatic test confirm it before any repair is planned.
- Independent local pros
- Free referral, no obligation
- You approve the price before work starts
What is different about sewer line repair in Houston?
The two tests answer different questions. The camera shows the inside of the pipe: scaling, cracks, roots and missing sections. The hydrostatic test fills the drain system with water to slab level and watches whether it holds, which shows whether the system is leaking into the soil under the house. A plumber often isolates sections to narrow down where.
Repairs range from replacing one bad section to replacing all the under-slab drains. Access is by tunneling beneath the house or by cutting through the floor, and sometimes lines are rerouted outside the foundation. Because leaking drains change the moisture in Houston's clay, foundation contractors and plumbers often need to coordinate the order of work.
From the Houston plumbing guide
Failing cast-iron drains under the slab
Decades of corrosion leave under-slab cast iron cracked or channeled along the bottom. Signs are recurring backups, sewer odors and sometimes foundation settling. A camera inspection and a hydrostatic test confirm it before anyone talks about tunneling or rerouting.
What to check and ask before work starts in Houston
- Ask for both a camera inspection and a hydrostatic test, with results in writing
- Ask which sections failed and whether a partial repair is realistic
- Ask how tunnels will be backfilled and compacted
- Inside city limits, ask who pulls the permit through the Houston Permitting Center
Licensing and permits for sewer line repair in Houston
Plumbers in Texas are licensed by the Texas State Board of Plumbing Examiners, and you can verify a license on the board's website. Inside the city limits, plumbing permits are issued through the Houston Permitting Center; unincorporated areas and separate cities such as Pasadena or Sugar Land have their own requirements.
Keystream Plumbing is a referral service. We do not perform plumbing work or hold a contractor license. The independent plumber you are connected with is responsible for licensing, permits and the work itself.
What the job usually involves
The steps are the same in Houston as anywhere; the local conditions above change how each one is done.
- Clear and camera
- Locate and mark
- Choose the method
- Permit, repair and inspect
Sewer Line Repair questions from Houston
How do I know if my Houston home has cast-iron drain pipes?
If it was built before about 1980 and the under-slab drains have not been replaced, it very likely does. Newer homes use PVC. A plumber can confirm the material and its condition with a camera through a cleanout.
What is a hydrostatic plumbing test?
The plumber blocks the sewer line where it leaves the house, fills the drain system with water to floor level and checks whether the level drops. A falling level means the drains are leaking under the slab. It is commonly requested before and after foundation repair.
Sources
- License search and consumer information, Texas State Board of Plumbing Examiners
- Winter weather preparedness, Ready.gov
Local information reviewed October 1, 2026. Rules and programs change; confirm details with the agency before you rely on them.
More plumbing help in Houston
Sewer Line Repair in other cities
Ownership rules, soil, water and pipe materials make this a different job from one city to the next.
Related guides: Main Sewer Line Clog: Signs and What to Do, When to Call an Emergency Plumber (and When It Can Wait).
Need sewer line repair in Houston?
Call (833) 520-4758. Same-day service is often available; call to check timing.