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Drain Survey Warning Signs and 7 Times Jetting Is the Answer

Drain survey warning signs and causes

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Drain Survey Warning Signs and 7 Times Jetting Is the Answer

Drains rarely fail overnight. In most homes, the problems build slowly, with a sink that takes a little longer to empty, a faint smell in the garden or a gurgle from the toilet after the bath runs out. These small signs are easy to ignore, but they are often the first clue that something is going wrong underground. A drain survey is the simplest way to find out exactly what is happening before a small issue turns into a costly repair.

At A Lings, our engineers carry out CCTV drain survey work across South London and Surrey every week. We also offer high-pressure water jetting, and one of the most common questions we hear is: “Do I need a survey, or can you just jet it?” This guide explains the warning signs to look out for, what a CCTV drain survey shows, and the seven situations where jetting really is the right fix.

Need help now? Call us on 020 3744 7298 or book a CCTV drain survey online.

Your Quick Guide to Drain Surveys and Jetting

What Is a CCTV Drain Survey?

A CCTV drain survey uses a small waterproof camera mounted on a flexible rod or a wheeled crawler. The engineer feeds the camera into your drains through an inspection chamber or access point, and the live footage is shown on a monitor above ground. As the camera travels along the pipe, it records the condition of the inside walls, the joints and any bends or connections.

The footage tells us far more than guesswork ever could. CCTV identifies visible defects inside the drain. Where required, sonde tracing can help locate the affected section and establish its approximate depth. After the drain survey, you receive a clear report with images and recommendations, so you know what needs doing and why. There is no digging, no mess and very little disruption to your home or business.

A drain survey is useful for homeowners, landlords, businesses and anyone buying a property. Many buyers in Croydon, Sutton, Kingston Upon Thames and the surrounding areas now book a pre-purchase CCTV inspection, because repairing a collapsed pipe after completion can cost thousands.

Warning Signs You Need a Drain Survey

Your drains usually give you plenty of notice before they fail. If you notice any of the following, it is worth booking a drain survey sooner rather than later.

Slow Draining Water

If sinks, showers or baths empty slowly, there may be a build-up of grease, soap scum or debris further down the line. When several fittings are slow at the same time, the problem is likely in the main drain rather than a single trap.

Bad Smells Inside or Outside

A persistent sewage smell around drains, manholes or the garden often points to a blockage, a cracked pipe or a displaced joint letting waste escape. Smells should never be ignored, as they can also indicate a health risk.

Gurgling Noises

Gurgling from plugholes or toilets usually means air is trapped in the system because water cannot flow freely. It is one of the earliest warning signs we see, and it often appears weeks before a full blockage.

Recurring Blockages

If the same drain blocks again and again, clearing it is only treating the symptom. A drain survey will show whether the real cause is a root intrusion, a dip in the pipe or a structural fault.

Damp Walls, Sinking Paving or Rodents

Leaking drains can wash away the soil around them, causing damp patches, subsidence or uneven patios. Rats can also enter homes through broken drain pipes. These are serious signs that need a professional inspection without delay.

What a Drain Survey Reveals

Every inspection we carry out is different, but these are the problems we find most often in South London and Surrey properties:

  • Fat, oil and grease build-up that narrows the pipe over time
  • Tree root intrusion through joints and cracks, especially in older clay pipes
  • Cracked, fractured or collapsed sections of pipe
  • Displaced or open joints that leak into the surrounding ground
  • Sagging or “bellied” pipes where water and waste collect
  • Foreign objects such as wet wipes, nappies or building rubble
  • Scale and limescale deposits in older systems

Drain survey warning experts

Knowing which of these you are dealing with is the key to choosing the right repair. This is why we often recommend a drain survey before any major work. It stops you paying for a fix that does not suit the problem.

7 Times Jetting Is the Answer

High-pressure water jetting sends a powerful stream of water through the drain to cut through blockages and scour the pipe walls clean. It is fast, effective and chemical-free, and you can read more in our guide to drain jetting in London and Surrey. As members of the Water Jetting Association, our engineers follow recognised safe working practices every time. Here are the seven situations where a drain survey usually confirms that jetting is the best fix.

1. Grease and Fat Build-Up

Kitchen drains in homes, restaurants and cafes collect fat, oil and grease that hardens on the pipe walls. Jetting breaks this down and flushes it away, restoring the full bore of the pipe.

2. Silt, Sand and Debris

After building work or heavy rain, drains can fill with silt, sand and grit. Jetting washes this material out quickly, especially in surface water drains and gullies.

3. Light Root Growth

When a drain survey shows fine roots entering through a joint, jetting with a root-cutting nozzle can clear them and restore flow. However, removing the roots does not seal the point where they entered, so repairs or further monitoring may still be required to stop them growing back.

4. Scale and Hard Deposits

In areas with hard water, scale can build up inside older pipes. Our engineers select the cleaning method, pressure and equipment to suit the pipe material and its condition. Stubborn deposits may require mechanical descaling rather than jetting alone.

5. Regular Maintenance for Businesses

Commercial kitchens, schools and offices benefit from planned jetting every few months. This keeps drains clear and helps avoid emergency call outs and closures.

6. Preparing a Drain for Repair

Before a pipe can be relined or patched, it must be completely clean. Jetting is the standard first step, and a follow-up camera check confirms the pipe is ready.

7. Soft Blockages from Wipes and Paper

Blockages caused by wet wipes, sanitary products or too much toilet paper are usually cleared quickly with jetting. To stop it happening again, it is worth reading the Water UK guidance on what should and should not go down the toilet.

When Jetting Is Not the Right Fix

Jetting is a brilliant tool, but it is not the answer to every drain problem. If a drain survey shows a collapsed pipe, a severe crack or a badly displaced joint, high-pressure water could make the damage worse. In these cases, the right solution may be drain repairs such as patch repairs, pipe relining or excavation and replacement.

Survey or Jetting First?

There is no single rule for which comes first. When we arrive, our engineer will assess which is needed first based on the symptoms and what they can see at the access points. A heavily blocked drain may need clearing before a useful CCTV inspection can be completed, because the camera cannot see past standing water and waste. Where the drain is flowing, a drain survey first shows whether jetting is safe and suitable for the pipe.

Either way, the aim is the same. Jetting a broken pipe might clear the blockage for a few weeks, but the problem will return, and you will have paid twice. With CCTV footage, you get the full picture and can make a confident decision.

A drain survey is also important if you share a drain with neighbours or suspect a fault in a public sewer. The footage helps show where responsibility lies, which can save time when speaking to your water company or insurer.

Why Choose A Lings for Your Drain Survey

A Lings is a local team covering South London and Surrey, including Banstead, Carshalton, Caterham, Croydon, Coulsdon, Kenley, Kingston Upon Thames, Mitcham, Morden, New Malden, Purley, Surbiton, Sutton, Wallington, Wimbledon and Worcester Park. Our engineers are fully trained and equipped with modern CCTV cameras and jetting units.

  • Water Jetting Association members, so you know the work is done safely and properly
  • Clear drain survey reports with photos and honest recommendations
  • Fast response times across the BN, BR, CR, GU, KT, RH, SE, SM, SW and TW postcodes
  • A full range of drainage services, from unblocking and jetting to repairs and relining
  • Experienced Surrey plumbers. We can also assess related plumbing issues and arrange any further work required.

Our engineers arrive on time, wear protective clothing and take care to leave your property clean and tidy. We explain what we are doing at every stage, and we are always happy to show you the camera footage on screen while we work, so you can see the problem for yourself.

We will never recommend work you do not need. If jetting will solve the problem, we will tell you. If the drain survey shows something more serious, we will explain your options clearly and give you a fair quote.

Whether you are dealing with a slow sink, a bad smell or a drain that keeps blocking, our team is ready to help. Book your CCTV drain survey or drain jetting today by visiting our contact page, and one of our friendly engineers will get back to you quickly.

BOOK A DRAIN SURVEY

Or call us on 020 3744 7298