Who Is Responsible for a Shared Drain on My Property?

If a drain serves only your property and stays within your property boundary, it is usually your responsibility. If it is shared with another property, it will usually be the responsibility of your water and sewerage company.

That sounds straightforward, but things can become less obvious when a drain runs through your garden, joins a neighbour's pipe or leaves your boundary before reaching the public sewer.

Across Wirral, Liverpool, Chester and much of the North West, the sewerage company is United Utilities. Below, we explain how to work out whether you're dealing with a private drain, shared drain or lateral drain - and who to contact when something goes wrong.

Who Is Responsible for a Shared Drain?

Here's the simplest way to look at it:

There are exceptions, particularly with private drainage systems, but this gives you a good starting point.

What Counts as a Shared Drain?

A shared drain or sewer is simply a pipe that carries wastewater from more than one property.

Take two neighbouring houses. Each may have its own drain taking wastewater away from the property. If those drains connect before reaching the main public sewer, the pipe from the point where they join is shared.

That's the point that matters.

The drain serving your home alone is private drainage. Once it joins drainage from other properties, responsibility will usually pass to the sewerage company.

United Utilities provides a useful explanation of how responsibility is divided between homeowners and the water company in its guide to sewers and drains.

What Is a Private Drain?

A private drain serves one property.

As a homeowner, you're normally responsible for the internal drainage and external pipework serving only your home while it remains within your property boundary.

So, if there's a blockage in a drain running from your house across your garden, and no other property uses that section, it's normally down to you to arrange for it to be cleared.

For rented properties, the landlord will often be responsible for maintaining drains and arranging necessary repairs, depending on the circumstances.

What Is a Lateral Drain?

This is where responsibility can become less obvious.

A lateral drain serves one property but sits outside that property's boundary before connecting to a public sewer.

For example, your private drain might cross your garden and then continue beneath the pavement. The section within your boundary is normally yours. The qualifying lateral drain beyond the boundary is normally maintained by the sewerage company.

So it isn't only a question of whose wastewater is in the pipe. Where the pipe is located can matter too.

Why Did Responsibility for Shared Drains Change?

Before 2011, homeowners could find themselves responsible for sections of shared private sewer. That sometimes meant neighbours having to work out between themselves who should arrange and pay for repairs.

The rules changed on 1 October 2011.

Responsibility for most private sewers and lateral drains connected to the public sewer network in England and Wales transferred to the relevant water and sewerage companies.

Under Section 94 of the Water Industry Act 1991, sewerage companies also have duties relating to the provision, cleansing and maintenance of public sewers.

That's why old advice saying neighbours must automatically split the cost of fixing a shared drain can be misleading today.

Citizens Advice also provides guidance on who is responsible for repairing drains and sewers.

Who Is Responsible for Shared Drains in the North West?

For much of the North West, including Wirral, Liverpool and Chester, the wastewater network is operated by United Utilities.

If a drain serves only your property and remains within your boundary, it will generally be your responsibility. Where drainage from several homes joins together, the shared sewer can be United Utilities' responsibility.

A good example is a row of terraced houses where several drains join beneath the rear gardens before heading towards the public sewer.

Even if that shared pipe happens to run underneath your garden, it doesn't automatically make it your drain or your repair bill.

Older terraced and semi-detached properties can have drainage layouts that aren't obvious from the surface. Where there's doubt, the route and connections may need to be investigated before anyone can say with confidence who is responsible.

How Can I Tell If My Drain Is Shared?

One of the first things to check is whether anybody else is having the same problem.

Signs that the issue could involve shared drainage include:

• Your neighbour's drains are playing up at the same time as yours
• Several properties have slow or backed-up drains
• Pipes from different directions enter the same inspection chamber
• Your drain joins another property's drainage
• The affected pipe continues beyond your boundary
• You live in a terrace, block of flats or development with a common drainage route

None of these proves responsibility on its own, but they can help narrow things down.

How Can a CCTV Drain Survey Help?

Sometimes there simply isn't enough information above ground to know what's happening below it.

A CCTV drain survey allows a drainage contractor to inspect accessible pipework with a specialist camera. Rather than guessing at the cause of a recurring problem, you can see what's actually happening inside the drain.

A survey can reveal:

• The location of a blockage
• Cracks and damaged pipework
• Tree roots
• Displaced joints
• Collapsed sections
• Connections and junctions
• Whether the problem appears to continue further along the sewerage system

This is particularly useful when you're trying to establish whether a fault is within your private drainage or further along the network.

RPD provides CCTV drain surveys in Wirral for homeowners, landlords and businesses that need to investigate underground drainage problems.

What Happens If a Shared Drain Is Blocked?

Start with what is actually affected.

If one kitchen sink is draining slowly but everything else is working normally, the problem is more likely to be local.

If your toilet, shower and outside drain are all struggling - and your neighbour is having problems too - that points towards a blockage further along the system.

Other warning signs include:

• Toilets that won't flush properly
• Water backing up into baths, sinks or showers
• Several slow drains at once
• Gurgling from plugholes or toilets
• Foul smells
• Wastewater backing up in an inspection chamber
• Similar drainage problems next door

If wastewater is backing up into the property, don't leave it to see whether it clears on its own. Sewer flooding needs prompt attention.

For a blockage within your private drain, you'll normally need to arrange clearance yourself. If the problem is within a shared or public sewer maintained by the sewerage company, report it to them instead.

What If the Shared Drain Runs Through My Garden?

A drain running through your garden isn't automatically your responsibility.

This is one of the easiest things to get wrong.

Shared and public sewers can pass underneath private land. If the pipe forms part of the sewerage company's network, they can remain responsible for it even though it's beneath your garden or driveway.

What matters is the type of pipe and the properties it serves - not simply whose land is above it.

What If the Blockage Is Outside My Property Boundary?

A drain serving only your home can still become the sewerage company's responsibility once it passes beyond your property boundary.

That's the lateral drain we mentioned earlier.

For example, imagine your drain runs from the house, across the front garden and underneath the pavement before reaching a sewer. You'd normally be responsible for the private section within your boundary. The qualifying section beyond it would usually be the sewerage company's responsibility.

There can be exceptions with private drainage arrangements, so check before arranging substantial work if the ownership isn't clear.

What If My Neighbour's Drain Runs Through My Property?

The same principle applies.

Your neighbour's drainage running underneath your land does not automatically make you responsible for it.

If their drain joins yours and the resulting pipe serves multiple properties, that shared section will normally be the sewerage company's responsibility if it forms part of the adopted network.

A genuinely private sewer or communal drainage system can be different, so establish its status before anyone agrees to pay for repairs.

Do Neighbours Have to Split the Cost of a Shared Drain Repair?

Usually not if it's an adopted shared sewer.

If the affected pipe forms part of the sewerage company's network, maintenance and repair will normally be their responsibility rather than a bill that neighbours divide between themselves.

Costs can still be shared where the properties use genuinely private drainage. That could include a septic tank, cesspit, private sewage treatment system or certain communal systems serving flats or other developments.

If you're being asked to contribute towards an expensive repair, make sure responsibility for the pipe has been established first.

What If the Drain Is Damaged Rather Than Blocked?

The basic rules don't change just because the problem is damage rather than a blockage.

If the damaged section is a private drain serving only your property within your boundary, arranging the repair will normally be your responsibility.

Common drain defects include:

• Cracked pipes
• Displaced joints
• Tree-root intrusion
• Ground movement
• Deteriorated pipework
• Collapsed drains

A blockage that keeps coming back after being cleared deserves closer attention. There may be a damaged pipe, root intrusion or another defect repeatedly catching waste.

RPD provides professional drain repair services for damaged private drainage. Where the cause isn't clear, a CCTV inspection can be used to locate the defect before deciding on the appropriate repair.

What About Road Drains and Highway Gullies?

The grates you see along the edge of a road are highway gullies. They collect surface water from the highway and are different from the drains carrying wastewater away from your home.

They are generally the responsibility of the relevant council or highway authority.

So, if a blocked road drain is causing surface water or road flooding, the council or highway authority is normally the right place to report it.

Who Should I Contact About a Drainage Problem?

It depends on which part of the system is affected.

Contact a drainage company if:

• The blockage appears to be within your private drainage
• You don't know where the blockage is
• The same drain keeps blocking
• You suspect a cracked or collapsed pipe
• Tree roots may be involved
• You need a CCTV drain survey

Contact United Utilities if:

• You believe a shared sewer is blocked
• Several neighbouring properties are affected
• The problem is within their public sewer network
• A qualifying lateral drain outside your boundary is affected

Contact your council or highway authority if:

• A highway gully is blocked
• A blocked road drain is contributing to road flooding

If you're not sure which category your problem falls into, finding the location of the blockage or defect is usually the best place to start.

How to Prevent Problems With Shared Drains

You can't control everything that enters a shared sewer, but you can make sure your property isn't adding to the problem.

A few basics make a difference:

• Don't flush wet wipes, nappies or sanitary products
• Keep fats, oils and grease out of the kitchen sink
• Scrape food waste into the bin
• Use strainers to catch hair and debris
• Clear leaves from accessible outside drains
• Don't ignore a drain that repeatedly blocks

If private drainage has an ongoing problem, drain maintenance or an inspection may help identify the cause before it develops into something more serious.

Frequently Asked Questions About Shared Drains

Who owns a shared drain?

Most shared sewers serving more than one property in England and Wales are now maintained by the relevant water and sewerage company. For much of RPD's service area, that's United Utilities. Private drainage systems can be an exception.

Am I responsible for a shared drain on my property?

Not simply because it's on your land. If the pipe serves other properties and forms part of the sewerage company's network, they'll normally be responsible for it.

Who is responsible for a drain serving only my house?

You normally are, while the drain serves only your property and remains within your boundary.

Who is responsible once my drain leaves my property?

A qualifying lateral drain beyond your property boundary will usually be the responsibility of the sewerage company.

Who pays for a blocked shared drain?

If it's an adopted shared sewer, the water and sewerage company will normally deal with it. If the blockage is in your private drain, you'll usually need to arrange and pay for clearance yourself.

What if my neighbour and I both have blocked drains?

Problems affecting neighbouring properties at the same time can point to a blockage in a shared section. Find out where the blockage is before deciding who needs to deal with it.

Can a shared sewer run through my garden?

Yes. Public and shared sewers can run beneath private land.

Does a shared drain become mine because it's on my land?

No. Its location alone doesn't determine responsibility.

How do I find out where my private drain becomes shared?

Inspection chambers and drainage plans may help. Where the layout isn't obvious, a CCTV drain survey can be used to investigate accessible drainage and identify connections.

Not Sure Who Is Responsible?

You don't need to work out the entire drainage layout before asking for help.

The key is finding where the blockage or damage is and which section of pipe is affected. From there, it should be much clearer whether the problem is yours to deal with or needs reporting to the sewerage company.

RPD works with homeowners, landlords and businesses across Wirral, Liverpool, Chester, Merseyside and the surrounding North West.

We can investigate private drainage problems, use CCTV drain surveys to locate blockages and defects, and carry out professional drain repairs where the affected pipe is your responsibility.

If you're having drainage problems and aren't sure where they're coming from, call RPD on 0151 668 0833 or contact RPD.

Sources

United Utilities - Sewers and drains explained
https://www.unitedutilities.com/help-and-support/wastewater-services/sewers-and-drains-explained/

Citizens Advice - Who is responsible for repairing drains and sewers?
https://www.citizensadvice.org.uk/consumer/water/sewerage/who-is-responsible-for-repairing-drains-and-sewers/

Ofwat - Transfer of private sewers
https://www.ofwat.gov.uk/publications/transfer-of-private-sewers/

GOV.UK - Water customers no longer liable for sewerage repairs
https://www.gov.uk/government/news/water-customers-no-longer-liable-for-sewerage-repairs

Water Industry Act 1991, Section 94
https://www.legislation.gov.uk/ukpga/1991/56/section/94

GOV.UK - Private sewer transfer regulations
https://www.gov.uk/government/publications/the-private-sewers-transfer-regulations