A CCTV drain inspection in Sydney puts a camera through a sewer or stormwater line to record its condition and confirm where it goes. It is worth commissioning before you build over or near a pipe, before you buy or redevelop a site, and whenever drainage records cannot be trusted.
A CCTV drain inspection in Sydney puts a camera through a sewer or stormwater line to record its condition and confirm where it goes. It is worth commissioning before you build over or near a pipe, before you buy or redevelop a site, and whenever drainage records cannot be trusted. This guide explains what a camera survey can and cannot tell you, and what a useful report looks like.
What a CCTV drain inspection is
A camera is fed into the pipe from a pit, inspection opening or cleared access point. Two types of equipment do most of the work:
- Push-rod cameras for smaller pipes, pushed by hand on a flexible rod.
- Crawler cameras for larger pipes, driven remotely on a tracked or wheeled unit with a pan and tilt head.
The operator records video, measures distance along the pipe, and logs each defect and connection against that distance. LCG Locating carries out CCTV and drainage investigation with push-rod and crawler units on pipes up to two metres in diameter.
When a camera survey is worth it
The cases that justify the cost are usually about decisions, not blockages:
- Building over or next to a sewer. Sydney Water commonly asks for the condition of its pipe to be known before approving work close to it.
- Before purchase or redevelopment. Old drainage is a hidden liability on commercial and industrial sites.
- Design of new connections. Engineers need to know the size, level and condition of the line they are connecting to.
- Dilapidation records. A before and after survey protects a contractor working near existing drains.
- Unexplained problems. Recurring blockages, subsidence beside a pipe line, or water appearing where it should not.
- Asset handover. New drainage is often inspected before a council or owner accepts it.
What the camera finds
Inside the pipe the survey records:
- cracks, fractures and collapsed sections
- displaced or open joints
- tree root entry
- sags that hold water
- silt, debris and hardened deposits
- intruding or defective connections
- pipe material and diameter changes
Defects are coded so that two inspections can be compared. In Australia the reference is the conduit inspection reporting code published by the Water Services Association of Australia, known as WSA 05. A report coded to it can be read by any drainage engineer or water authority.
Connectivity mapping: where the pipe actually goes
Condition is half the value. On older sites the more useful question is often which pit connects to which, and where the line runs between them.
A sonde, a small transmitter fitted to the camera head, lets a locator trace the pipe from the surface as the camera travels. Each junction and change of direction can be marked on the ground and surveyed. That turns a video into a plan. Combined with utility survey and mapping, the drainage network goes into the same model as the other underground services, with invert levels at the pits.
This is also how non-conductive clay, concrete and PVC drains get located at all. They cannot be traced electromagnetically without something inside them.
What a camera cannot tell you
A camera sees the inside of the pipe and nothing else. It does not show the bedding, the soil around the pipe, or a void forming outside the wall. It cannot see through standing water in a sag, past a blockage, or through heavy silt. If the line is dirty, the survey is of the dirt.
That is why some lines need to be jetted clean before inspection, and why an abandoned survey, where the camera could not pass, is still a finding. It tells you where the obstruction is. If the concern is ground loss around a pipe, the camera needs to be paired with ground penetrating radar or other subsurface reporting.
What a useful report includes
Ask for these before you accept a price:
- video of each line with distance on screen
- a log of every observation with distance, code and photo
- pipe material, diameter and direction of flow
- start and finish points identified against a site plan
- a plan of the located alignment, if connectivity mapping is in scope
- a summary of defects by severity
A video file with no log is of little use to an engineer. A coded report with a plan can be priced for repair, issued to an authority or attached to a contract.
Who the survey is for
This kind of inspection is aimed at builders, civil contractors, engineers, strata and facility managers, and councils. It is an investigation service, not an emergency plumbing call-out. If a household drain is blocked right now, a licensed plumber with a jetter is the right first call, and the camera work can follow if the cause needs to be documented.
Building over or adjacent to a Sydney Water asset has its own approval process. Check the current requirements with Sydney Water or a water servicing coordinator before design is finalised, because the inspection scope is often set by them.
Getting the site ready
A camera survey goes faster when:
- pit lids are found and can be lifted, with vehicles moved off them
- the lines are flowing, or jetting has been arranged first
- any existing drainage plans are on hand
- flows can be reduced or diverted for larger pipes
- confined space requirements are known in advance for deep pits
Next step
Gather any drainage plans, note which pits you can find, and tell us what decision the survey needs to support. Request a quote and we will scope the inspection and mapping together.
Common questions
What does a CCTV drain inspection show?
A CCTV drain inspection shows the internal condition of a pipe, including cracks, collapses, displaced joints, root entry, sags, debris and connections. It also confirms the pipe material and diameter. With a sonde and surface tracing, it can record where the pipe runs and how pits are connected.
When do I need a CCTV inspection before building?
You need one when building over or close to an existing sewer or stormwater line, when connecting new drainage to an old line, or when an authority requires the condition of its asset to be recorded. It is also sensible before buying or redeveloping an older commercial site.
Can CCTV locate where a drain runs underground?
Yes, when the camera carries a sonde. The transmitter is traced from the surface as the camera moves through the pipe, so the alignment and depth can be marked and surveyed. Without a sonde, the camera records distance along the pipe but not its position on the ground.
How long does a CCTV drain survey take?
A few short lines on a small site can be inspected in a couple of hours. Larger networks, deep pits or lines that need cleaning first take longer. Access to pits and the cleanliness of the pipes affect the time more than their length.
Does the pipe need to be cleaned first?
Often, yes. Silt, grease and roots hide the pipe wall and can stop the camera. Lines in regular use with good flow may be inspected as they are. Where records suggest years without maintenance, plan for jetting before the survey.