A plumbing camera inspection shows the inside of a drain or sewer line. It can find roots, grease and debris, cracks and breaks, offset or separated joints, sags, collapses, the pipe material, and where a lateral connects. It cannot see a leak that is not visible on the pipe wall or tell you the pipe's remaining life.
What a camera can find
NASSCO, the trade association for sewer rehabilitation, calls closed-circuit television (CCTV) inspection the most important tool for assessing the condition of a sewer pipe. According to NASSCO, it shows structural condition, the shape and material of the pipe, and problems with operation and maintenance. It can also locate obstructions such as roots, grease, debris and cross bores. On a home sewer line, that looks like this:
| What you see on the video | What it means |
|---|---|
| Fine roots at a joint, or a dense root ball | Roots have found an opening; see signs of tree roots in a sewer line |
| Grease, scale or debris coating or narrowing the pipe | A maintenance problem, not a broken pipe |
| A crack, hole or broken section | Structural damage that cleaning will not fix |
| A joint that has slipped out of line, or pipe sections pulled apart | An offset or separation; a common entry for roots |
| A dip where water pools (a sag or "belly") | The pipe has lost slope and will keep collecting waste |
| A collapsed or crushed section | The line is failing; the camera may not get past it |
| Pipe material and diameter | Clay, cast iron, plastic and other materials each fail in their own way |
| Where a branch or lateral connects | Useful for planning repairs and locating the line |
InterNACHI, the home inspectors' association, says a sewer scope can reveal blockages, damage to the pipe system, and other problems.
What a camera cannot tell you
A camera is powerful, but it is not magic. It shows what its lens sees. Be careful with these limits:
- It does not measure remaining life. It shows condition today, not how many years the pipe has left.
- It may not get past a blockage or collapse. If the camera stops, you know something is there, and you may need to clear the line and re-scope.
- It cannot see through standing water. A sag full of water can hide cracks below the waterline.
- It sees the inside only. It does not show soil voids, or leaks that are not visible on the pipe wall. NASSCO notes that other tools, such as sonar and laser profiling, ground-penetrating radar and acoustic methods, exist for those questions.
- It is only as good as the operator. A shaky, rushed or unlabeled video is worth much less than a slow, marked one.
How to read a defect: severity and extent
NASSCO's grading system rates each defect from 1 to 5 for severity, and multiplies by how many times it appears. Its example: two pipes with holes graded at severity 4 get different overall ratings if one has a single hole and the other has five. The lesson for a homeowner is the same. Ask two questions about every finding: how bad is it, and how many are there? A single defect graded low may need nothing at all, while a run of moderate ones can add up to a real repair. One cracked joint is a local fix. The same crack at every joint is a different job, and our page on whether to fully reline, partly reline or do nothing shows how the answer changes.
When a camera inspection makes sense
Most sewer cameras can also carry a locator transmitter, so the plumber can mark the exact spot and depth of a problem on the surface above it. That matters when a repair means digging, and it settles who owns the damaged stretch, as our page on who is responsible for the sewer line in Phoenix explains.
- Repeat clogs or slow drains, especially when several drains back up together.
- Before you buy a house. See should you get a sewer scope before buying and roots in old clay sewer pipes when buying.
- After a cleaning, to see whether the cleaning fixed the cause or only cleared it. The page on whether hydro jetting keeps tree roots from coming back explains why this matters.
- Before any sewer repair. You want the footage to show what is damaged and where, and a second camera pass afterward to confirm the repair.
- On an older line, even without symptoms.
### Three examples of what a scope can show
These are made-up examples to show how findings turn into decisions, not real jobs.
Clean pipe, one slow drain. The line is round and clear, and the slow drain turns out to be a fixture trap. You saved a repair you did not need.
Roots at two joints. The pipe is otherwise sound. The plumber clears the roots and records the joints, and you decide whether to line them or watch them.
A sag with standing water and a hairline crack beyond it. The camera cannot see clearly through the water. A cleaning and a second pass, with a plumber who can pump or clear the water, tells you whether the crack is real before you spend on a repair.
Why the video matters as a record
Cities use camera inspections the same way. Phoenix says a sewer TV crew inspects its lines with a remote camera before cleaning, to look for obstructions and evaluate the integrity of the line. It also says the city does not inspect private home sewer lines, and points owners to a plumber for that. Mesa goes further: its form says the best way to identify and locate a damaged or broken section is to have a licensed plumber break through the blockage and record the section with an inspection camera. If the damage is off-property in a street or alley, that recording can be given to the city.
So ask for the video, not just a verbal summary. Ask for these things:
- 1The full recording, including the entry point and the end of the run.
- 2Notes on where each finding sits, such as the distance from the cleanout.
- 3The pipe material and diameter.
- 4A second recording after any cleaning or repair.
Keep the files with your house records, and name them with the date and the address so you can find them years later. A plumber who is confident in the work will not mind handing over the footage. If you sell, a buyer's scope will look at the same pipe, and your video shows what you knew and when.
### What comes after the camera
The footage sorts the next step into one of a few bins: nothing needed, a maintenance plan, a spot or full liner, or replacement. See what a sewer line replacement involves and sewer line replacement cost factors for the larger jobs, and how to maintain your sewer line to prevent backups for the routine.
HQ Plumbing gives free estimates and upfront pricing, and can walk you through the footage so you know what each finding means before you decide on a repair.