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Blocked Drains Portsmouth: Who Is Responsible to Fix Them?

Diagram showing homeowner and Southern Water responsibility for blocked drains in Portsmouth, with underground drainage pipes between properties

Table of Contents

Blocked drains cause disruption quickly. However, confusion often follows when homeowners try to determine who is actually responsible for repairs. In Portsmouth, responsibility depends on drain location, usage, and ownership.

Understanding this distinction early prevents delays, unnecessary callouts, and rejected claims.

Why Drain Responsibility Is Often Misunderstood

Many homeowners assume the water company handles all drainage problems. In reality, responsibility is split between private property owners and the water authority.

Because older Portsmouth properties often share drainage routes, responsibility is not always obvious.

Private Drains: When the Homeowner Is Responsible

You are usually responsible for drains that:

  • Serve only your property
  • Run within your boundary
  • Connect internally to your home

If these drains block, crack, or collapse, repairs typically fall to the homeowner.

This includes kitchen waste pipes, bathroom drainage, and external pipes running solely from your property.

Shared and Public Drains Explained

Responsibility changes once a drain:

  • Serves multiple properties
  • Runs beyond your boundary
  • Connects to the public sewer

In these cases, the water company usually becomes responsible for maintenance and repairs.

For blocked drains Portsmouth residents experience, determining whether the drain is shared is often the key factor.

Southern Water vs Portsmouth Water

A common point of confusion is the difference between water suppliers and sewer operators.

In Portsmouth:

  • Portsmouth Water supplies clean water
  • Southern Water manages wastewater and sewers

Drainage issues relating to shared or public sewers are handled by Southern Water, not the clean water supplier.

How to Confirm Drain Ownership

Before arranging repairs, it’s wise to confirm responsibility. This can be done by:

  • Checking sewer maps
  • Reviewing property deeds
  • Using a CCTV drain survey to trace connections

Accurate identification avoids paying for work that may not be your responsibility.

Why Early Diagnosis Matters

Delays often make drainage problems worse. Blockages can escalate into flooding or structural damage if left unresolved.

Knowing who is responsible allows repairs to begin immediately without disputes or delays.

When Professional Help Is Advisable

If responsibility is unclear, professional drainage contractors can:

  • Trace pipe routes
  • Identify shared connections
  • Provide evidence for water company involvement

This approach prevents unnecessary costs and speeds up resolution.

Frequently Asked Questions

How do I know if a drain is private or shared?

A CCTV drain survey can trace pipe routes and confirm whether other properties connect to the same drain.

Does the water company fix all external drains?

No. Only shared or adopted drains fall under water company responsibility.

Who maintains drains in terraced houses?

Responsibility depends on whether the drain serves multiple properties or just one.

Can Southern Water refuse repairs?

They may refuse if the drain is confirmed as private.

Should I attempt DIY fixes before reporting issues?

Basic checks are fine, but repeated blockages should be professionally assessed.

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