Who's Responsible for a Blocked Drain? Homeowner, Landlord, or Water Company?

Water is backing up in your garden. The drain is blocked, it smells, and you want someone to fix it. But whose problem is it? Yours, your landlord's, or the water company's? The answer depends on where the blockage sits and what type of drain is affected. Get it wrong and you could end up paying for a repair that should have been free, or waiting days for a water company crew when a private drainage engineer could have sorted it in an hour.

The quick answer: private vs public drains

In the UK, drainage responsibility splits into three categories:

• Private drains. These serve your property only and sit within your boundary. They are your responsibility. If they block, you pay for the repair.
• Lateral drains. These run from outside your property boundary to the point where they connect to the public sewer. Since October 2011, your water company is responsible for these.
• Public sewers. These serve multiple properties and are maintained by the water company. In the West Midlands, that is Severn Trent Water.

The simplest test is this: if the drain serves only your property and sits within your boundary, it is yours. If it sits outside your boundary or serves more than one property, it is almost certainly the water company's responsibility.

What changed in 2011? The private sewer transfer

Before October 2011, homeowners were responsible for maintaining lateral drains and any shared private sewers that connected to the public network. This meant that if a pipe outside your boundary failed, you had to pay for the repair yourself, even though you might share that pipe with 10 other properties.

The Private Sewer Transfer, which came into effect on 1 October 2011, moved responsibility for most lateral drains and shared private sewers to the local water company. For homeowners across Birmingham, Solihull, and the wider West Midlands, that means Severn Trent now maintains and repairs these pipes at no cost to you.

The key word is "most". Some private sewers were excluded from the transfer, particularly those built after July 2011 or those that do not connect to the public sewer at all (for example, drains leading to a septic tank or cesspit). If you are not sure whether your drain was included, Severn Trent can check their records.

What is a lateral drain?

A lateral drain is the section of pipe that runs from the boundary of your property to the point where it joins the public sewer. It sits outside your boundary, usually under a pavement, verge, or neighbouring land. Before 2011, you were responsible for it. Now, Severn Trent maintains lateral drains across the West Midlands at no charge.

This is worth knowing because many blocked drains that homeowners think are their problem actually sit on the lateral section. If you lift your inspection chamber cover and the chamber is clear but the pipe running out towards the road is blocked, the blockage is likely on the lateral drain, and that is Severn Trent's job to fix.

Homeowner, landlord, or tenant: who pays?

If you own your home, private drains within your boundary are your responsibility. But what about rental properties?

• Landlords are responsible for the structural condition and maintenance of the drainage system. This covers cracked pipes, root damage, collapsed sections, and any defect that existed before the tenant moved in. Under the Landlord and Tenant Act 1985, landlords must keep the drainage in proper working order.
• Tenants may be liable if the blockage was caused by misuse. Flushing wet wipes, sanitary products, or nappies down the toilet, or pouring cooking fat down the kitchen sink, are common causes of blockages that could be attributed to the tenant.

In practice, proving who caused a blockage can be difficult. Most landlords cover the cost of clearing a blocked drain as a maintenance expense and deal with any tenant liability separately. A CCTV drain survey is the best way to settle the question, because the camera footage shows exactly what caused the blockage and where it sits.

How to report a blocked drain to Severn Trent

If you think the blockage is on a lateral drain or public sewer, report it to Severn Trent directly. Here is how:

1. Call 0800 783 4444. Their line is open 24 hours a day, seven days a week. Tell them the location of the blockage, whether it is on the highway or private land, and whether sewage is involved.
2. Report online. Severn Trent have an online reporting tool on their website where you can log a blocked drain with a map pin. They typically respond within 24 hours for non-emergency blockages.
3. Emergency situations. If sewage is flooding into a property or onto a public road, make it clear this is an emergency. Severn Trent prioritise these calls and aim to attend within a few hours.

Severn Trent will send a crew to inspect the drain. If the blockage is on their network, they will clear it at no charge. If the blockage turns out to be on your private section, they will let you know and you will need to arrange a private drain unblocking company to clear it.

When to call a private drainage company

If the blocked drain sits within your property boundary and serves only your home, it is your private drain and Severn Trent will not touch it. That is when you need a private drainage company. Signs you are dealing with a private drain problem:

• The blockage is in an inspection chamber inside your boundary.
• Only your property is affected (neighbours are fine).
• The drain runs from your kitchen, bathroom, or downpipes to the first manhole.
• Severn Trent have inspected and confirmed it is not on their network.

We clear private drains for homeowners and landlords every day. Our engineers carry jetting, CCTV, and rodding equipment on every van, so we can diagnose the problem and clear the blockage on a single visit. Private drain unblocking typically costs from £100 for straightforward rodding, with jetting from £120 and CCTV surveys from £150. For a full breakdown of what this costs, see our drain unblocking cost guide. If you are planning any building work near a sewer, our guide on build over agreements explains what you need from Severn Trent before you start.

Areas we cover across Birmingham and the West Midlands

We provide emergency drainage services across Birmingham, Solihull, and the wider West Midlands, including Selly Oak, Cotteridge, Dorridge, and Dickens Heath. We also cover Warwickshire and Worcestershire. If you are unsure whether your blocked drain is private or public, call us and we will check on site.

Questions about drain responsibility

Who is responsible for a blocked drain?

You are responsible for private drains that serve only your property and sit within your boundary. Your water company (Severn Trent in the West Midlands) is responsible for lateral drains outside your boundary and public sewers that serve multiple properties. This changed with the 2011 private sewer transfer.

Is a blocked drain the landlord's responsibility?

Generally, yes. Landlords are responsible for the structural condition and maintenance of the drainage system on rental properties. However, if the blockage was caused by tenant misuse, such as flushing wet wipes, sanitary products, or pouring cooking fat down the drain, the tenant may be held liable for the cost of clearing it.

How do I report a blocked drain to Severn Trent?

Call Severn Trent on 0800 783 4444 (available 24 hours). You can also report a blocked drain through their website. They will ask for the location of the blockage, whether it is affecting the highway or private land, and whether sewage is involved. If the blockage is on a public sewer or lateral drain, they will send a crew to clear it at no charge.

What is a lateral drain?

A lateral drain is the section of pipe that runs from outside your property boundary to the point where it connects to the public sewer. Before October 2011, homeowners were responsible for maintaining lateral drains. Since the private sewer transfer, water companies like Severn Trent now maintain and repair lateral drains at no cost to the property owner.