Drainage professional discussing a domestic drain problem with a homeowner

Illustrative image of the relevant drainage feature or investigation.

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What to look for first

Responsibility can depend on whether the obstruction is in private drainage or a public sewer. Identify whether several properties are affected and the location of the restriction.

Before arranging disruptive work, separate what has been observed from what is only suspected. Ask whether one outlet is involved or whether several drain to the same point.

What else might cause it?

A blocked drain inside the property boundary is not always privately owned. Drainage faults can overlap with surface-water problems, poor plumbing connections or unusual weather, so timing and location deserve attention.

Getting the right work done

Check with the sewerage company before ordering substantial work on a shared run. Ask for a clear explanation of the problem, the proposed method and what evidence will show that the work was successful.

Safety: If sewage is backing up or overflowing, stop using the affected appliances where possible, keep children and pets away, and seek appropriate help. Never enter a drain or manhole. If wastewater is near electrical equipment, avoid the area and seek qualified advice.

Before you agree to major work

Get the proposed work and its limits in writing. For costly repairs, ask for photographs or survey evidence locating the defect and consider a second quotation. Where the affected run may be shared or adopted, check ownership before arranging privately funded work.

Related reading:
Who is responsible for a shared drain? →How do I find out if my drain is public? →More drain ownership & responsibilities guides →