Sewer camera inspection: what the video shows and how to read it

The plumber pulls the camera back out, hands you a link or a thumb drive, and says the line has a belly at forty feet and some scale. If you are buying a house, selling one, or deciding whether to jet or replace, that one sentence carries a lot of weight, and it helps to understand what you are looking at. This guide is about reading the footage and the report, not running the camera. That is the plumber’s job, and on a line under a slab it is not a rental-tool project.

What the footage looks like

A sewer camera is a waterproof head with LEDs and a lens on a stiff push cable, fed in through the cleanout, a pulled toilet, or a roof vent. The picture is a tunnel view: the pipe wall curving away, a water line along the bottom, joints passing as rings, and a counter in the corner showing how many feet of cable are out. The head is self-leveling on most units, so the bottom of the pipe stays at the bottom of the picture. Expect the image to go dark or cloudy where the head dips under water or pushes through debris. That is normal, and it is also information.

Reading the pipe material

The wall tells you what you have before anything else does.

• Cast iron looks dark, rough, and scaled, often with a pebbled or rusty texture, and joints that show as heavy rings. Common under homes built before about 1975 in Lee and Collier County.
• Clay appears as short sections, roughly two feet, each with a joint, glazed and often orange or tan. Found mostly in the yard on older sewer laterals.
• PVC is smooth and white or cream, with solvent-welded joints that barely show. Homes from the 1980s on, and any replaced section.
• A change in material mid-run means a past repair. Note the distance; that spot is where the next problem tends to show up.

The defects, one at a time

• Bellies. A sag where the pipe has settled and holds water. On camera, the water line rises up the walls until the picture goes fully under, then clears on the far side. Our sandy fill and high water table make bellies common. A shallow belly is a maintenance item; a deep one holds solids and clogs on a schedule.
• Offsets. A joint where one section sits higher or lower than the next, leaving a step in the pipe. Paper catches on the lip. Small offsets are lived with; a large one is a repair point.
• Cracks and breaks. A dark line running along or around the wall, sometimes with soil visible through it. In cast iron the bottom of the pipe often goes first, and the camera shows a channel, a trench worn in the floor of the pipe, before it shows an actual hole.
• Roots. Fine white or brown strands hanging from a joint, or a mat that fills the picture. Ficus, oak, and palm roots enter at joints, so a root shot also tells you a joint has opened.
• Scale. Rough buildup on cast iron that narrows the pipe. Heavy scale looks like the inside of a cave. It is why old lines clog on wipes that pass through PVC without a thought.
• Grease. A smooth, pale coating on the top and sides of a kitchen line, thicker as it goes.
• Water sitting with no belly visible means a blockage downstream, or the line simply has not drained yet from what was just run.

The distance counter and locating

The counter is the difference between “there is a problem” and “there is a problem under the guest bath.” Each defect is called out by its footage from the entry point. Most camera heads carry a transmitter, and the plumber walks the surface with a locator wand to mark the spot and the depth on the floor or the yard. Ask for those marks to be photographed. On a slab home, that mark decides whether the repair is a spot dig in the yard, an opening in the floor, or a reroute overhead.

What a written report should include

Video alone is not a report. Ask for, at minimum: the date and the entry point; the pipe material and size, with any change noted; every defect with its footage, a still image, and a plain severity; the locate marks with depth; the total length run and where the camera stopped, and why, if it did not reach the main or the tank; and a recommendation with options. If the line was cleaned first, the report should say so, since a camera through a dirty line sees less. A one-line text that says the line looks okay is not an inspection.

Using it in a sale, and what the camera cannot tell you

For a buyer, a sewer scope during the inspection period turns an older home with cast iron into a specific repair list with locations, which is what a negotiation runs on. For a seller, a clean scope done before listing removes the argument. Either way, keep the video and the report with the house records.

The limits matter too. The camera sees the inside of the pipe, not the outside. It cannot tell you how thin a cast iron wall is, only that it is scaled, and a pipe that looks whole can be a shell. It cannot see past standing water without draining it, past a collapse, or through a fitting the head will not pass. It cannot see the vent system or the supply lines. And a scope is a snapshot; a line that was fine in the dry season can show a belly in September when the ground is saturated.

If you have a video from an inspection and are not sure what it means, send it to us along with the report. We can tell you what we see and what we would do next.