Who is responsible for blocked drains?

Who is responsible for blocked drains: the quick guide

Find where the blockage is, then read across.

Most homes connected to the sewer before July 2011 follow this pattern. Flats, newer estates and homes with a septic tank can differ.

What changed on 1 October 2011

Until 2011, a pipe shared by a row of houses usually belonged to the houses it served, and so did the stretch of your own drain under the pavement. When one blocked, neighbours had to agree who paid.

The Water Industry (Schemes for Adoption of Private Sewers) Regulations 2011 changed that. On 1 October 2011, private sewers and lateral drains in England and Wales that connected to a public sewer before 1 July 2011 passed to the local water company, with private pumping stations following by 1 October 2016. The government guidance issued with the rules confirms the manholes on those pipes went too. Ofwat keeps a summary.

These did not transfer:

• drains inside your boundary that serve only your home
• pipes to a septic tank, cesspit or treatment plant that doesn't reach the public sewer
• rainwater pipes running to a soakaway, ditch or stream
• communal drains inside one managed site, such as a block of flats or a caravan park
• sewers connected after 1 July 2011 that were never adopted
• a few owned by railway operators, or on Crown land that opted out

Drains on your property: what's yours

Wessex Water puts it simply: you're usually responsible for the pipes serving your home up to your boundary, or up to where they join shared pipework, whichever comes first. That covers:

• every pipe and fitting inside the house
• underground drains in your garden or drive that carry only your waste
• gullies (the small grated drains where sink waste and downpipes empty) and inspection chambers on your drains
• gutters, downpipes, soakaways and septic tanks

The law calls the land that goes with your home its "curtilage". For most houses that just means everything inside your boundary.

What is a lateral drain?

A lateral drain is the part of your own drain that lies outside your boundary. Only your waste goes through it, but it runs under the pavement, the road or a neighbour's land to reach the sewer. The Water Industry Act 1991 defines it as the part of a drain running from the curtilage of a building to the sewer.

Lateral drains connected before July 2011 now belong to the water company, so a blockage there is theirs to clear at no cost to you. You can't simply hire someone to dig one up, either: the 2011 guidance says householders have no authority to commission work on a public sewer or lateral drain without checking with the water company first.

Who is responsible for shared drains?

A shared drain is any pipe carrying waste from more than one property. The law calls it a sewer, even when it's a narrow pipe under a back lawn. They're common behind terraces and between pairs of semi-detached houses.

If a shared drain connected to the public sewer before 1 July 2011, it now belongs to the water company, wherever it runs. Southern Water asks people not to pay a private contractor to clear a shared section, because contractors aren't allowed to work on public sewers. Report it, and the water company clears it free.

How do I know if I have a shared drain?

• Lift your manhole cover (on your own land, and only if it's safe). A pipe entering from a neighbour's side means a shared run.
• Ask the neighbours. A cover next door on the same line as yours usually means a shared pipe.
• Don't trust a blank sewer map. Wessex Water's free online map says private drains and connecting pipes are not normally shown, and many pipes that transferred in 2011 were never drawn in. The water company can still tell you whether a pipe transferred.
• Get it mapped. A CCTV drain survey with a drain plan shows exactly where your pipe joins anyone else's.

Who is responsible for drains outside my house?

It depends where "outside" is.

• In your garden or drive, serving only you: yours.
• In your garden but shared, or under the pavement or road: the water company's. Ofwat notes public sewers can pass through gardens and the water company has a right of access to them.
• A road gully: the highway authority. That's BCP Council in Bournemouth, Christchurch and Poole, Dorset Council for the rest of Dorset and Hampshire County Council for most Hampshire roads. Southampton City Council covers the city, and National Highways runs trunk roads such as the A31.
• A private road the council never adopted: usually whoever owns or manages it, often a residents' management company.

Who is responsible for manhole covers on my property?

A manhole goes with the pipe underneath it. If only your drain runs through the chamber, the chamber and cover are yours. If it sits on a shared drain or public sewer, it's likely the water company's, even in your garden. Wessex Water asks you to report a damaged manhole or drain cover; it checks its records, fixes covers it's responsible for and tells you if one is private.

Don't hide a chamber under paving or decking, and don't build over a public sewer without the water company's agreement. Building near drains is covered by Part H of the Building Regulations (Approved Document H).

Landlord or tenant: who pays for a blocked drain in a rented property?

In most rented homes, the landlord. Section 11 of the Landlord and Tenant Act 1985 covers almost every tenancy of a home let for less than seven years. It makes the landlord keep the structure and exterior in repair, "including drains, gutters and external pipes", and keep toilets, sinks and baths in proper working order. A tenancy clause can't pass those duties to the tenant. GOV.UK puts it plainly: landlords are always responsible for repairs to sanitary fittings, including pipes and drains.

Tenants must use the home in a "tenant-like manner", doing the small jobs a sensible tenant would do. In Warren v Keen (1954) the Court of Appeal's example was clearing a sink blocked by the tenant's own waste. GOV.UK adds that tenants pay for damage their household causes.

If you rent: tell your landlord or agent straight away, in writing, with photos, and stop using the affected toilet or sink. Only book a contractor yourself if your tenancy allows it. If neighbours are affected, you can report it to the water company yourself. If your landlord won't act and sewage is a health risk, contact environmental health at your local council, which can order a blocked drain cleared within 48 hours under section 17 of the Public Health Act 1961.

If you're the landlord: ask the engineer to record what they found and where. Footage and a written note of the cause are the fairest way to settle who pays, and the kind of evidence a deposit dispute needs.

Council and housing association tenants report it through the landlord's repairs line in the same way.

Who is responsible for blocked drains in flats?

For flats, the lease decides. Most flats are leasehold, and each lease says which parts are yours and which are shared. The usual pattern:

• Pipes inside your flat that serve only you, such as your sink waste: usually yours.
• Shared soil stacks and communal drains around the building: usually the freeholder or management company, paid through the service charge.
• Pipes beyond the building's grounds: usually the water company. The 2011 guidance treats a block and its grounds as one site, so the water company took on pipes from the edge of that site, not the communal drainage inside it.

Renting a flat? Call your landlord, who deals with the managing agent. Own one? GOV.UK explains your right to be consulted on service charge costs when planned work would cost any leaseholder more than £250.

Newer estates: pipes that were never adopted

Homes connected to the sewer after 1 July 2011 missed the transfer. Automatic adoption of new sewers, in section 42 of the Flood and Water Management Act 2010, has never been switched on in England as far as we can find in September 2026. Instead, a developer can agree adoption with the water company under section 104 of the Water Industry Act 1991. Until then the pipes stay private, and repairs usually fall to the developer, a management company or the homes they serve. The drainage and water search from your purchase (usually a CON29DW) should say whether the sewers are adopted.

Wessex Water and Southern Water: who to call in Dorset and Hampshire

• Bournemouth, Poole, Christchurch and most of Dorset: Wessex Water. Use its report a problem page or call 0345 600 4 600. If sewage from the public sewer is flooding your home or garden, the Sewage Floodline is 0345 850 5 959, 24 hours a day. Our Wessex Water blocked drain guide walks through the checks.
• Most of Hampshire, including Southampton, Lymington and New Milton: Southern Water. Report online or call 0330 303 0368.

Bournemouth Water supplies tap water across much of this area but doesn't look after sewers. Its wastewater page has a postcode search showing which sewerage company you have. Numbers checked September 2026.

Does home insurance cover blocked drains?

Usually not the blockage, but often the damage behind it. The Financial Ombudsman Service says most buildings policies cover damage to underground pipes you're responsible for, not ones owned by the water company or a neighbour. Wear and tear is the usual reason claims fail, and many policies exclude pitch fibre pipes. Clearing a simple blockage is normally for home emergency cover, if you have it. Tell your insurer before any repair. Our guide to the signs of a collapsed drain covers claims in more detail.

What it costs when the blockage is yours

In September 2026, MyJobQuote put general drain unblocking at £80 to £100 and an outside drain at £80 to £150. Our drain unblocking starts at £80, and most jobs come to £80 to £200. No call-out fee, and you get a fixed price agreed before any work starts. All prices include VAT. See our prices page for the rest.

Blocked drain responsibility: common questions