A drain camera inspection, also called a CCTV drain survey, is the only reliable way to see what is actually happening inside a drain. A waterproof camera is fed through the pipe on a flexible rod or crawler unit and sends live footage back to a screen above ground, so a blockage, crack or root intrusion can be identified and located precisely instead of guessed at. In practice it turns a drainage problem from a matter of opinion into something you can watch on a monitor.
This guide explains how the equipment works, what it detects and when you would want one. If you are ready to arrange the work, see our CCTV drain inspection service for Cape Town, which covers pricing factors and the areas we cover.
How a drain camera inspection works
The process is straightforward and, importantly, non-invasive. Nothing is dug up to carry out the survey itself.
- Access. The operator finds a way into the line, usually an existing inspection chamber, a rodding eye or a gully. On a commercial site there may be several.
- Preparation. A camera cannot see through standing sewage or a solid plug of fat, so a badly blocked line is cleared or jetted first. This is why a survey is sometimes quoted alongside a clean.
- The survey. The camera head, ringed with LEDs, is pushed along the run on a coiled rod or driven on a small tractor unit in larger-diameter pipe. Footage is watched live.
- Locating the fault. A sonde in the camera head transmits a signal that is picked up by a locator at ground level, giving the position and depth of anything found. That is what allows a repair to be dug in one spot.
- Reporting. The recording and a written summary go to you, with a recommendation on what, if anything, needs doing.
What a drain camera inspection shows you
The camera travels the drain run and records its condition along the way. A competent operator will note not just the fault but its position and depth, so any repair can be targeted rather than exploratory. Typical findings include:
- Collapsed or deformed sections of pipe
- Tree roots entering through joints and cracks
- Hardened fat, grease and scale build-up narrowing the bore
- Cracks, fractures and the source of leaks
- Displaced or open joints where ground water and soil are entering
- Bellies and back-falls where the pipe has sagged and water stands
- Foreign objects, rubble left by builders, and wipes
Blockages and obstructions
Most call-outs start here. The value of the camera is that it distinguishes between a one-off obstruction, which a clean will fix, and a narrowing caused by scale or a deformed pipe, which will simply block again. Our guide to the causes and effects of blocked drains covers the usual culprits.
Structural damage
Older clay and cement pipework cracks as the ground moves and as heavy vehicles pass overhead. Left alone, a hairline fracture becomes a collapse, and a collapse under a driveway or a slab is an expensive excavation. Catching it on camera while it is still a crack is the entire argument for surveying early.
Tree root intrusion
Roots follow moisture. A joint that weeps slightly will draw fine roots in, and those roots then thicken until they fill the pipe and catch everything passing. Footage shows how far the intrusion runs, which determines whether cutting them out will hold or whether the section has to be replaced.
When you should book one
Before buying a property
Drainage is not visible on a viewing and is rarely covered by a standard inspection. A survey before transfer costs a fraction of what a collapsed connection costs once the property is yours.
When a blockage keeps coming back
A recurring blockage is a symptom. Clearing it repeatedly is paying for the symptom. A camera finds the defect that keeps causing it. The signs that you need an inspection are usually obvious in hindsight: slow drainage across several fixtures, gurgling, or damp patches appearing in the garden.
Before and after drainage work
Beforehand, so the job is scoped and quoted on fact. Afterwards, so you can see the line is clear and the repair holds before you sign anything off.
When you smell something you cannot find
Persistent sewage odour means gas is escaping somewhere: a dried-out trap, a broken vent pipe, or a cracked drain under a floor. A camera tells you which one.
Where drain camera inspections are used
The same technique scales across property types. On residential drainage it is generally one or two runs between the house and the municipal connection. On commercial sites, restaurants, guesthouses, shopping centres and factories, surveys are usually planned maintenance rather than emergencies, because an unplanned drainage failure closes the doors. On industrial and municipal networks, crawler units survey large-diameter mains that cannot be inspected any other way. CCTV camera inspections are the standard first step in all three cases for the same reason: you cannot sensibly plan a repair you have not seen.
Inspection or survey: is there a difference?
Not really. “CCTV drain survey” is the older British term and still appears on South African quotes and conveyancing paperwork. “Drain camera inspection” is the phrasing most South Africans actually use. Both describe the same work: a camera in the pipe and a report at the end. If a quote mentions one and you asked for the other, you are looking at the same service.
What happens after the inspection
Most surveys end with a clean rather than a repair. Where the pipe is sound but dirty, high-pressure cleaning restores the full bore. Where a fault is found, you have its position and depth, which means a targeted excavation rather than trenching hopefully across the property. Either way you are making the decision on evidence. The City of Cape Town’s residential water and sanitation services pages explain where the municipality’s responsibility for a sewer line ends and the property owner’s begins, which a survey will often settle one way or the other.
Book a drain camera inspection in Cape Town
Drain Blasters has surveyed and cleared Cape Town drains since 2007. If you want costs and coverage, see our CCTV drain inspection service page, or contact us with the address and a short description of what the drain is doing.
