Locating our water pipes and sewers


If you’re building on land, then it’s a good idea to identify whether there are any of our pipes in the ground first. Any damage to our pipes is an offence under the Water Industry Act 1991.

Get maps of water mains and sewers

We have maps of our water mains and sewerage network. 

We will provide you with a plan at a scale of 1:2500 based on the x and y co-ordinates provided.

We can provide it in the following sizes:

A4 (297 x 210 mm)

A3 (420 x297 mm)

A0 (1189 x 841 mm)

How much will it cost?

  • The cost for obtaining a plan is currently £8 per plan.
  • To apply online you’ll need a valid debit or credit card.

Important to note

For some areas, we aren’t the correct organisation to ask for public water and sewerage plans.

  • In terms of public water plans, you’ll need to contact Hafren Dyfrdwy for the following areas:
    • Heswall
    • Neston
    • Whitchurch, Shropshire
    • Chester
    • Wrexham
  • For public sewerage plans you’ll need to contact Severn Trent for the following areas:
    • Parts of Ledbury
    • Worcester
    • Knighton
  • If you live in these areas or are interested in obtaining a plan for properties within these areas, contact us and we will be able to help with any queries.

Extending your home?

It’s our job to collect surface water and wastewater from homes and businesses across Wales and parts of England. And to do this we use our vast network of sewer pipes, over 30,000 km of them in total - that’s enough to stretch to Australia and back!

Our sewers run under the ground all over our operating area, in streets and gardens, fields and land. So, if you’re building an extension, chances are there will be a sewer pipe nearby.

If you plan to build over, or within three metres of one of our water mains, sewer pipes or lateral drains, you’ll need to let us know. You cannot start work until we’ve consented to your application. However, please note that we won’t allow you to build over or near to any of our pressurised sewerage mains or water mains.

Find out more here.

Diversions for larger builds

If you’re working on a larger build and are interested in diverting our water mains or sewers in order to improve that land, then you’ll need to apply for a diversion.

The cost is £2,000+VAT per application, which will then be deducted from the final charge once the work has been carried out.

Important note

  • In line with the Water Industry Act 1991, we have a duty to consider all reasonable diversion requests.
  • However, a diversion which would mean increased operational costs, or that the water main or public sewer would be unusable, inaccessible or see its performance reduced would typically be considered unreasonable.