New Appointments and Variations (NAVs)

The Water Industry Act 1991 incorporates legislation which makes provision for sites within an existing undertaker’s area to be served by another undertaker. Where an alternative undertaker is appointed, a NAV is made by Ofwat.


There are three circumstances in which a NAV can be granted:

1.  Where the premises of one or more customers is supplied (or is likely to be supplied) with at least 50 megalitres of water per year. The same criterion applies for water recycling services;

2.  Where no premises within the area are served by an appointed company i.e. the site is ‘unserved’. This includes areas which are supplied by private, unregulated supplies. This criterion has to be met for both water and water recycling services;
3.  If the existing appointed company consents to the transfer of that area.
The alternative supplier (the “NAV appointee”) will hold an Instrument of Appointment and therefore have all the same duties and responsibilities to the customers within the NAV appointment site as the previous statutory supplier.


Every NAV must have access to adequate water resources and/or water recycling facilities in order to service the customers on the site. If the site is within the Anglian Water statutory area of supply and the NAV does not have direct access to its own water resources and/or water recycling facilities, these services can be purchased from Anglian Water Wholesale.

For water, this is purchased in the form of a bulk supply of water delivered to an agreed point, usually at the site boundary.

For used water, this is purchased in the form of a discharge point, usually at the site boundary, where bulk effluent is discharged into our water recycling system.

The supply of these services is governed by legal agreements, which are negotiated between the parties.


NAV enquiries can be submitted through our customer portal, InFlow. Our service level is 15 business days. Where additional modelling work is required, our Pre-development team will be in contact.


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