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New mains provided by us

IMPORTANT NEWS - With effect from the 1 April 2018 the way that Developer Services charge for their work is changing. Please click here to find out more.

If you think your development may require a new water main, we can give you advice and lay a new main for you.

As the appointed ‘water undertaker’, we are responsible for all the water mains in our supply area. This means we have a legal duty to make sure that new mains are laid correctly, whether they are laid by us, or whether you choose the self-lay option.

Mainlaying Terms and Conditions

New mains provided by us


If there is no public water main on your development site or outside of your property, you may want to apply for a new water main, commonly referred to as requisitioning.  We can design and construct the new water main for you through the requisition process.

To be eligible to apply for a water requisition, you must be building two or more properties that have not previously benefited from a water supply from South West Water.

You can also employ your own contractor to self lay water mains and services, please click here for details.

If you require a new or replacement water connection to a new or existing main, head to our water connections page
Self-Lay Mains and Services Policy

Flowchart and charges


Information on our Developer Services Charging Arrangements can be found here.

Please view 'Customer Flowchart - Requisition water mains' for more information.

Application form and guidance notes

You can apply for a new water main using our Application Form

You will also need to complete the Risk Assessment for Water Pipes in Land Potentially Affected by Contamination form.

Please complete all sections and provide the information requested so that your application can be processed as quickly and accurately as possible.

Our performance


There is a set of standards produced by Water UK that measure our performance for our Developer Services activities and the results are published on a quarterly basis.  Please click here for more information.



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