When something goes wrong underground, finding the cause isn't always straightforward.

A drain might keep blocking even after it's been cleared. You might notice an unexplained smell, water draining slowly or problems that disappear for a while before returning.

In situations like these, repeatedly treating the symptom isn't necessarily the answer. Sometimes you need to see what's actually happening inside the pipe.

That's where a CCTV drain survey comes in.

A CCTV drainage survey allows a drainage engineer to inspect underground pipework from the inside, helping identify problems that would otherwise remain hidden.

In this guide, we'll explain how a CCTV drain survey works, what it can find and when having one carried out could save you from repeated drainage problems.

What Is a CCTV Drain Survey?

A CCTV drain survey is an inspection of underground drainage pipes using a specialist waterproof camera.

Rather than excavating the ground to investigate a problem, the camera is fed directly into the drainage system through a suitable access point, such as an inspection chamber.

As the camera travels through the pipe, the engineer can examine its internal condition and look for anything that could be affecting the drainage system.

This provides a much clearer picture of what's happening underground without immediately resorting to disruptive excavation.

What Happens During a CCTV Drain Survey?

The first step is usually to identify a suitable access point to the drainage system.

Depending on the property, this could be an inspection chamber, manhole or another accessible section of the drain.

The CCTV camera is then introduced into the pipework and carefully guided through the drainage system.

As it moves through the drain, the engineer monitors the footage and looks for signs of damage, obstruction or deterioration.

This might include:

Cracks in the pipe
Displaced or separated joints
Tree root intrusion
Scale and debris build-up
Partial collapses
Foreign objects
Evidence of previous repairs

The position of a problem can also be identified, helping establish where further work may be required.

What Problems Can a CCTV Drain Survey Find?

One of the biggest advantages of CCTV inspection is that many different drainage problems can produce very similar symptoms above ground.

For example, a drain that repeatedly blocks could simply contain a build-up of debris.

But it could also have a damaged joint that's catching waste every time water passes through it.

Alternatively, tree roots may have entered through a small crack and started growing inside the pipe.

Without inspecting the drain, it can be difficult to know which problem you're dealing with.

A CCTV survey removes much of that uncertainty.

Recurring Blocked Drains

If a drain has been cleared but keeps blocking again, it's usually worth asking why.

Clearing the blockage restores the flow, but it doesn't necessarily resolve whatever caused the blockage to form.

Our guide to what causes blocked drains explains some of the most common reasons drains become obstructed.

Where blockages repeatedly return in the same section of drainage, CCTV inspection can help determine whether there's an underlying structural issue.

Depending on what the survey reveals, the solution may involve high-pressure water jetting, root removal or a repair rather than simply clearing another blockage.

Tree Roots Inside Drains

Tree roots can cause significant problems within older drainage systems.

Roots naturally seek sources of moisture and can exploit very small gaps around damaged pipe joints.

Once inside, they can continue growing and begin catching waste travelling through the pipe.

A CCTV inspection allows us to see whether roots have entered the drainage system, how extensive the intrusion is and whether the pipe itself has been damaged.

Where appropriate, specialist root intrusion removal can then be used to clear the pipe.

We'll explore this particular drainage problem in much more detail in our guide to tree roots in drains.

Cracked, Displaced or Collapsed Pipes

Not every drainage problem is caused by something inside the pipe.

The pipe itself may be damaged.

Older drainage systems can deteriorate over time, while ground movement can cause joints to separate or sections of pipework to become displaced.

As we discussed in our guide to how summer drought can affect older drainage systems, changes in ground conditions can sometimes expose weaknesses in ageing underground pipework.

A CCTV survey can reveal the condition of the drain and help determine whether a repair is necessary.

In some circumstances, damaged sections can be repaired using patch liners and no-dig repairs, avoiding the need to excavate large areas around the property.

When Should You Consider a CCTV Drain Survey?

You don't need a camera inspection every time a drain becomes blocked.

If the cause is obvious and the blockage clears successfully, further investigation may not be necessary.

A CCTV survey becomes particularly useful when:

The same drain repeatedly becomes blocked
A blockage has been cleared but the problem quickly returns
Several drainage symptoms are occurring together
Tree root intrusion is suspected
Structural damage is suspected
You're experiencing unexplained drainage problems
Previous attempts haven't identified the cause

The important distinction is that drain clearance solves an immediate obstruction, while CCTV inspection helps investigate why the problem is happening.

Do Drains Need to Be Cleared Before a CCTV Survey?

Sometimes.

If a drain is completely blocked or heavily contaminated with grease, silt or debris, the camera may not be able to provide a clear enough view of the pipe.

In these situations, the drain may need to be cleared or cleaned first.

Our blocked drain service can restore the flow, while professional water jetting can clean deposits from the inside of the pipe where required.

Once the pipe is sufficiently clear, CCTV equipment can be used to investigate its condition more accurately.

What Happens After the Survey?

A CCTV survey isn't the repair itself.

Its purpose is to give us the information needed to recommend the right next step.

If the drainage system is structurally sound and the problem was simply an obstruction, no further repair may be required.

If the inspection reveals another issue, the appropriate solution will depend on what we've found.

Heavy Deposits or Debris

The drain may require professional cleaning using high-pressure water jetting.

Tree Root Intrusion

The roots may need to be removed using specialist root intrusion removal equipment before the condition of the pipe can be fully assessed.

Localised Pipe Damage

A patch liner or no-dig repair may provide a way of repairing the affected section without extensive excavation.

More Significant Structural Damage

Further drainage repairs may be necessary if the inspection reveals more extensive damage.

This is why accurately diagnosing the problem before recommending work is so important.

CCTV Drain Surveys Across Norfolk, Suffolk & Cambridgeshire

Underground drainage problems can affect properties of any age, but older homes can present particular challenges because their drainage systems may have been underground for decades.

At 1st Response Drainage, we provide CCTV drain inspections throughout Norfolk, Suffolk and Cambridgeshire.

We regularly help homeowners and businesses in areas including Ipswich, King's Lynn, Great Yarmouth and Newmarket investigate drainage problems that aren't immediately obvious from the surface.

Whether you're dealing with recurring blockages, suspected pipe damage or another unexplained drainage issue, identifying the cause is the first step towards choosing the right solution.

You can view all of the towns and areas we cover on our locations page.

Our Expert Advice

If you've had the same drain cleared more than once, don't automatically assume it simply needs clearing again.

A recurring blockage is often worth investigating.

The important question isn't just:

"What's blocking the drain?"

It's:

"Why does it keep blocking?"

CCTV inspection gives us the opportunity to answer that question.

Finding a damaged joint, root intrusion or another structural defect early can prevent repeated callouts and help you deal with the underlying problem rather than continually treating the symptom.

How 1st Response Drainage Can Help

At 1st Response Drainage, we use CCTV drain inspection as part of a wider approach to diagnosing drainage problems accurately.

Depending on what we find, we can provide:

Rather than recommending unnecessary work, the aim is to understand the condition of your drainage system and identify the most appropriate solution.

Related Guides

If you're experiencing a drainage problem, you may also find these articles useful:

FAQs

How long does a CCTV drain survey take?

The time required depends on the size and condition of the drainage system and what needs to be investigated. A straightforward inspection may be relatively quick, while a larger system or more complicated drainage problem can take longer to assess properly.

Can a CCTV drain survey find a collapsed drain?

Yes. CCTV equipment can help identify damaged, displaced or partially collapsed sections of drainage pipework. If the camera cannot pass beyond a particular point, further investigation may sometimes be required to determine the full extent of the problem.

Can CCTV find tree roots in drains?

Yes. Root intrusion can usually be clearly identified during a CCTV inspection. The survey can also help establish where the roots have entered and whether they've caused damage to the surrounding pipe.

Do you need to dig up the garden for a CCTV drain survey?

Usually not. The camera is normally introduced through an existing access point, allowing the underground drainage system to be inspected without excavation.

Is a CCTV survey worth having if my drain keeps blocking?

Recurring blockages are one of the main situations where a CCTV survey can be particularly useful. Instead of repeatedly clearing the obstruction, the survey can help identify whether an underlying problem is causing it to return.

Need Help Finding the Cause of a Drainage Problem?

If you've got a drainage problem that keeps coming back, identifying the cause could save you from repeatedly dealing with the same issue.

1st Response Drainage provides professional CCTV drain surveys and drainage investigations throughout Norfolk, Suffolk and Cambridgeshire.

Explore our CCTV drainage survey service, find your nearest service area on our locations page, or contact us to discuss the problem with our team.

What Is A CCTV Drain Survey And When Do You Need One