Key takeaways
- A utility line drilled through a sewer pipe
- Often a gas line, sometimes cable or fiber
- It stays hidden until something cuts it
- A camera inspection before mechanical cleaning is the safeguard
How it happens
Utilities often install lines by horizontal drilling, boring underground without opening a trench. If the crew does not know where the sewer lateral is, the new line can punch straight through it.
The sewer pipe stays in use, with a foreign line passing through the middle.
Why it is dangerous
A gas line crossing a sewer is a hazard if a drain cleaner or a root cutter breaks into it. Gas can enter the sewer and the building. That is why the topic matters for anyone doing mechanical cleaning.
Most lines have no cross bore. The risk is where recent trenchless utility work took place nearby.
How cameras find them
A camera shows a smooth round object cutting through the pipe, often with a seam or cut-out in the pipe wall. We stop immediately, record it and do not disturb it.
Inspecting before any mechanical cleaning is the best habit.
What to do if suspected
Do not run a mechanical cleaner. Contact your utility with the video and location. Tell your plumber what you saw.
Ask your utility if they have inspected the area for cross bores.
Quick answers
Is cross bore common?
It is not common on any single line, but it is a recognized industry concern.
Is every line at risk?
No. The risk comes from trenchless utility installation near the sewer.
Want a professional look at your own pipe?
Schedule a camera inspection with the form below, or call (615) 952-0844.
