Why the camera alone is not enough
A camera shows what is wrong and how far down the line it is, but distance along a pipe is not the same as a position in your yard. Sewer laterals bend, change direction at fittings and sometimes run under the house before heading to the street. Without locating, sixty feet of cable could mean several different spots on the surface.
Locating closes that gap. Most sewer camera heads carry a small radio transmitter, often called a sonde. A handheld receiver tuned to the same frequency picks up its signal from above ground, so the plumber can stand over the camera head and mark that exact point.
How a locate is usually done
- Park the camera at the finding.The plumber pushes the camera to the problem spot and holds it still so the transmitter stays in one place.
- Sweep with the receiver.Walking the area with the receiver, the plumber looks for the strongest signal and the characteristic pattern that shows the transmitter is directly below.
- Read the depth estimate.Many receivers display an approximate depth once the transmitter is pinpointed.
- Mark the spot.Paint, a flag or chalk on concrete records the location and often the estimated depth.
- Trace the route if needed.Repeating the process at intervals along the line sketches the path of the pipe, which helps when planning digging or construction.
What can throw off a locate
| Factor | Why it matters | What to ask |
|---|---|---|
| Depth | Signals weaken and estimates get less precise as the pipe gets deeper. | How confident are you in this depth reading? |
| Nearby metal | Rebar in slabs, metal fences and other buried lines can distort the signal. | Did anything nearby interfere with the reading? |
| Pipe angle | A transmitter tilted on a slope or in a fitting can shift where the peak signal appears. | Was the camera head level at this mark? |
| Other utilities | Gas, water and electric lines can sit near the sewer route. | Have public utilities been marked before digging? |
| Surface | Thick concrete, pavers or landscaping make it harder to mark and to confirm. | How will you mark the spot on this surface? |
Locating with a camera versus tracing without one
Camera-mounted transmitter
- Marks a specific finding seen on video
- Works on clay, cast iron and plastic pipe
- Depth estimate at each mark
- Needs access into the line
Guessing from fixtures
- Relies on where pipes exit the house
- Misses bends and fittings
- No depth information
- Can lead to digging in the wrong place
Locating in Fullerton yards and slabs
On many Fullerton tract homes the lateral leaves the house under a slab-on-grade foundation, so part of the run may be beneath a floor rather than a lawn. Locating tells you whether a finding is under concrete, under a driveway or in open soil, which affects what kind of repair is practical. If the mark lands near the property line or in the parkway, check with the City of Fullerton about responsibility and permits before anyone digs.
Questions to ask about locating
- Is locating included in the inspection, or separate?
- Will you mark every finding or only the main problem?
- Can you note the estimated depth beside each mark?
- Will you photograph the marks so I have a record after they wear off?
- Can you sketch the route of the line on a simple site plan?
Common questions
How long do locate marks last?
Paint on grass fades with mowing and watering, and chalk on concrete washes away. Photograph the marks with something in frame for scale so you keep a record.
Can a plastic sewer pipe be located?
Yes, when the camera's transmitter is inside it. The receiver detects the transmitter, not the pipe material.
Will 811 mark my sewer lateral?
Calling 811 before digging notifies public utility owners so they can mark their lines. Private lines on your property, such as your sewer lateral, are generally your responsibility to locate.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.