New Appointments and Variations (NAVs)

New Appointments are made where a limited company is appointed by Ofwat to provide water and/or sewerage services for a specific geographic area.

Variations are created when an existing appointed company asks Ofwat to vary its Appointment so that it can extend the areas it provides services to.

A NAV is a water and/or wastewater provider in its own right and replaces the statutory water company in the area or areas for which Ofwat grants an application. They have the same duties and responsibilities as the previous company.

A site will be eligible for applying for a new appointment and variation if it is:

  • unserved;
  • for a large user; or
  • given consent by the incumbent water and/or sewerage company.

For more information please click on the headings below :-

Information for NAVs considering new sites in our area

If you are a NAV considering potential sites within South West Water’s appointed area of supply, in order to make your application to Ofwat for the new appointment, you’ll need some information from us, as the incumbent water and/or sewerage company.

If you’re looking to make a bulk connection with our network(s), we can also help you set up the bulk agreement(s), arrange for any site-work and set you up as our customer.


The links below provide further information.


If you have any questions Please click here to contact the team


Information on how to apply for a new appointment or variation is on Ofwat's website

NAVs already operating in our area

We understand you may be working with a number of different Wholesalers and we want to make it easy for you to deal with us.

We have a dedicated contact point to help you and your teams to work effectively with the South West Water Team.


Please click here to contact the team

Information for Developers

Developers may be able to choose a NAV rather than South West to supply services for a particular site or premises. The NAV would then become the monopoly provider for that particular site.


To have a development connected to a NAV, you will have to contact a NAV and discuss the arrangements. The NAV must then apply to Ofwat for an appointment or a variation of their appointment in order to serve the site.


Ofwat provides further information on its website:

Pre Development - Point of connection information

If you are planning to connect to our waste water and/or clean water network and you would like to understand the options which are available for the connection and an estimate of the likely cost of the connection before you make a formal application to us, we can provide you with the point of connection information and a budget estimate.

Please click here for more information.

New Connection and Developer Services Charging Arrangements

Draft Bulk Supply and Discharge Agreements

Depending on the type of service you will provide we will need to set up bulk supply and / or discharge agreements with you.

Copies of our draft agreements can be found on the links below. These are industry standard documents which came in to effect on 1 July 2020.

Please note that we are developing special conditions which align with our New Connection and Developer Services Charging Arrangements and our Bulk Charges for NAVs. These will be available with an updated questionnaire as soon as possible. Please contact us if you have any questions in the meantime.

Clean Water
Bulk supply agreement
Special Conditions (sample)
Bulk supply questionnaire: under development

NAV meter reading and information supply agreement

Bulk Supply Charges

Consultation on NAV Bulk Charges 2021/22 - Now Closed

Consultation on NAV Bulk Charges 2021/22 - now closed

In the following consultation we asked for your views on our proposals for 2021/22 Bulk Charges for NAVs


Bulk Charges for NAVs 2021/22 - consultation on proposals


The consultation closed at 5pm on the 22 December 2020. Please see below for a summary of the comments we received and our responses.

South West Water Consultation responses 2021/22