Drainage responsibility is one of the most misunderstood areas of property ownership. Many homeowners assume all drains on their land are their problem — but that’s not always true. Understanding the distinction between private drains and public sewers can save you hundreds of pounds on repairs.
The Key Distinction
Private drain: A pipe that serves only your property. You are responsible for maintaining it from where it leaves your property to the point it connects to the public sewer — and, in most cases, within your property boundaries too.
Public sewer: A pipe shared by two or more properties, or a main sewer that connects to the public network. In Greater Manchester, United Utilities is responsible for public sewers.
The 2011 transfer of private sewers meant that many lateral drains (pipes that cross from your property boundary to the public sewer) are now United Utilities’ responsibility. Before 2011, homeowners were responsible for those too.
The Legal Framework
The primary legislation is the Water Industry Act 1991, as amended by the Water Industry (Schemes for Adoption of Private Sewers) Regulations 2011.
In practical terms:
- Drains serving a single property and within that property’s boundary = your responsibility
- Shared drains and lateral drains beyond your boundary = United Utilities’ responsibility
- Drains within your boundary that serve two or more properties = borderline — check with United Utilities
How to Work Out What You Have
Step 1: Check the Drainage Plans
Your local authority and United Utilities hold sewer maps. United Utilities has an online tool that shows the public sewer network. If your drain appears on the public sewer map, it’s their responsibility.
Step 2: Get a CCTV Survey
The most reliable way to establish where a blockage or defect is — and who owns that section of pipe — is a CCTV drain survey. The footage shows the pipe’s condition and, combined with a measured survey, can establish whether the fault is within your private section or further along in the public network.
Step 3: Call United Utilities (if appropriate)
United Utilities offers a free service to investigate reports of sewer problems on the public network. Call 0345 672 3723 or report online. They will attend, survey, and repair public sewer faults at no cost to you.
Common Scenarios in Manchester
Terraced Houses
In a Victorian terraced street, properties often share a single back drain that runs through the rear yards. Since 2011, this is typically a public sewer maintained by United Utilities. If this drain blocks, you should report it to United Utilities first.
Semi-Detached and Detached Houses
The private drain serving only your property is yours. The point where it joins a drain serving multiple properties marks the boundary of your responsibility.
Flats and Apartments
Individual flat drains feed into shared stack pipes. The stack and main drain are usually the freeholder’s or management company’s responsibility, not individual leaseholders.
What Happens When Responsibility Is Disputed?
If United Utilities decline responsibility and you believe they’re wrong, you can escalate:
- Request a written explanation from United Utilities
- Commission an independent CCTV drain survey with a measured report
- Contact the Consumer Council for Water (CCW) if the dispute continues
- As a last resort, seek legal advice
In our experience, most disputes are resolved quickly once a proper survey establishes where the fault is.
Emergency Situations: Don’t Wait for the Dispute to Resolve
If sewage is backing up into your home, you cannot wait for an ownership dispute to be settled. The immediate priority is stopping the damage.
Call us on 0161 282 8080 and our emergency drain team will attend, contain the problem, and produce a written report identifying the location and likely cause of the blockage. This documentation is essential whether you end up pursuing United Utilities or making an insurance claim.
We cover Manchester, Salford, Bury, Rochdale, Bolton, and Wigan.
Frequently Asked Questions
Is the drain under my garden my responsibility?
Yes — private drains within your property boundary are your responsibility, even if they run under your garden, driveway, or garage floor.
My neighbour’s tree roots have blocked our shared drain. Who pays?
If the drain is a public sewer, United Utilities deals with it. If it’s a private shared drain, responsibility is shared between the connected properties. If one owner caused the damage (e.g. planted the tree), they may be liable — but this requires legal advice to establish.
Can United Utilities charge me for attending?
United Utilities should not charge you for investigating a reported sewer fault on the public network. If the problem turns out to be in your private drain, they will advise you and leave without charge. Any remedial work on your private section is then your cost.