Tower Hamlets' Rat Problem and What It Means for Your Drains

Rats are a long-running problem in Tower Hamlets, and the council hears many complaints about them. The 2017 Whitechapel fatberg showed how stressed the East London sewer network can be. Pest controllers blame restaurant waste and dense housing. Both play a part, yet the deeper cause is the state of the Victorian drains under almost every street.

Why Tower Hamlets Has a Rat Problem

Rats do not live in sewers by choice. They go where they find warmth, shelter and food, and a 19th-century combined sewer offers all three. It carries both sewage and rainwater. Many drains under Tower Hamlets are 100mm clay laterals that feed into larger brick sewers. Some are cracked, filled with roots or pulled apart at the joints.

A rat can squeeze through a gap about the size of a 50p coin, and a cracked joint in a clay lateral makes a hole larger than that. Once inside, a rat can reach the whole connected system, from the main sewer to the pipe under your garden.

London's rat numbers have grown in recent years, because waste has increased while old drains have decayed. Rats getting in through bad drains is no longer rare. It is a predictable result of putting off maintenance.

The Drain Connection: How Rats Get In

Fractured pipes

London Clay movement can crack a clay lateral, which exposes the pipe to the soil around it. Rats already living nearby find the crack, because moisture and waste leak out of it. They then use it to get inside.

Displaced joints

Soil settlement or roots can pull pipe sections apart, and the gap is big enough for a rat. It also lets in groundwater, roots and debris, so blockages form faster. Surveys often find these joints in Tower Hamlets homes.

Broken inspection chambers

Brick or concrete chambers give access to drains in gardens and under paths. They crack with age, and a broken lid or crumbling wall gives rats a way in at ground level, with no need to dig through soil.

Connections to the public sewer

Thames Water's sewers under Tower Hamlets are ageing too. Rats that enter from the street can reach private laterals through any weak connection. So a home can have rats in its drains even when its own pipes look sound, since the way in may be upstream.

What Rat Activity in Drains Looks Like

Watch for these signs of rats using your drains.

• Scratching or scurrying in the walls at night, along the line of the drain
• Droppings or grease marks near gullies, chambers and drain covers
• Gnaw marks around the base of the soil stack
• A drain smell that grows stronger in cold weather
• Rats in the garden near chambers or gullies

No single sign proves rats are getting in through the drain. However, with a history of blockages or slow drains, they strongly suggest you need a CCTV inspection.

What to Do About It

Step 1: CCTV survey the drain run

A CCTV drain survey usually finds the fault. It may be a cracked pipe, a displaced joint, an open rodding eye or a broken chamber. The footage is a record of exactly where the defect is and what repair it needs.

For outdoor drain blockages, a survey is the most cost-effective first step, since it shows whether the blockage has a structural cause that will return, or whether it was a one-off build-up.

Step 2: Repair the defect

Because every drain differs, the repair depends on what the survey finds.

• Cracked or displaced pipe. Relining can fix it, although severe damage may need excavation and replacement. Relining suits a drain under a rear garden or shared path.
• Open joints. Relining seals them without digging. Where the ground still moves, a patch lining at the defect may last longer.
• Broken chambers. The chamber needs repair or replacement with modern materials.

Step 3: Report to Thames Water if the defect is in adopted pipework

If the defect is in the part Thames Water has adopted, send it the footage. That covers the lateral outside your boundary and the main sewer. Thames Water must repair faults in its own pipes. Because the CCTV report gives an exact location, it can speed up the response.

See our page on blocked drains in Tower Hamlets. While neighbouring boroughs share the same Victorian network, see our pages for Hackney and Southwark too.

Frequently Asked Questions

Is a rat in my drain Thames Water's problem or mine?

It is a shared problem, because if the defect that lets rats in is in your private drain, you must repair it. If it is in the public sewer, report it to Thames Water. A CCTV survey with a drainage plan shows exactly where the entry point is.

Can I seal my drain to stop rats getting in?

You can fit a rodent barrier. This is a one-way valve that lets waste out but stops rats moving upstream. It helps as a short-term step, yet it does not replace repairing the defect. A valve in a cracked pipe will not last long.

How common is rat ingress through drains in Tower Hamlets?

Drain faults are a common finding when we look into pest-related drain problems. Homes built before 1940 that have never had a drain survey are the most at risk. Mature gardens add to it, since roots have had years to work on the joints.

Will the pest controller deal with the drain issue?

No, because a pest controller can remove the rats and block entry points at ground level. They cannot survey drain runs, find structural defects or reline pipes. For a lasting fix, you need both services together.

How much does a CCTV drain survey cost in Tower Hamlets?

The cost depends on the number of drain runs and the access available. Request a quote online via our contact form and we confirm the price before any work.