New Appointments and Variations (NAVs)
NAVs are companies who offer water and/or wastewater services in areas previously served by the local water company.
A new appointment
A new appointment happens when Ofwat appoints a company for the first time to provide water and/or sewerage services in a specific area.
A variation
A variation happens when a company already providing services asks Ofwat to expand its service area. The new provider has the same responsibilites as the previous water company.
Get started with NAV applications and enquiries
Our services to NAVs
If you’re a NAV company looking to become the appointee for a site that’s in our area, you’ll need some information from us to support your application to Ofwat.
We’ve outlined what to do and how to do it below:
Before you start development, request our existing mains and sewerage network plans to check that your site is in our area (charges apply).
You can view our maps for free (appointment only) by visiting our head office: Severn Trent Centre, 2 St John’s Street, Coventry, CV1 2LZ.
If you need confirmation that a site is “unserved” to support your application, please send us a site plan showing the boundary on an Ordnance Survey (OS) map.
For brownfield sites, if there are any existing buildings within the proposed NAV area, please share any details you have about the current bill payer and any plans to disconnect those services.
Site served requests should be sent to new.connections@severntrent.co.uk and we’ll get back to you within 21 days.
Apply now:
If you’d like to understand what’s needed to supply your new site with bulk water and/or sewer connections, send us a NAV development enquiry before making a full application.
We’ll assess how your development might affect our water or sewer network and respond within 28 days. Our reply will include:
Apply now:
If we’re supplying your site with bulk water and/or wastewater services, we’ll need to set up a Bulk Supply and/or Bulk Discharge Agreement. Ofwat requires this agreement to be in place before they can approve your appointment or variation.
You can request the agreement by emailing us at NAVenquiries@severntrent.co.uk.
When you're ready for your bulk water connection, you’ll need to submit a separate mains application and send it to new.connections@severntrent.co.uk.
This will allow us to send you a NAV offer letter with a detailed design and a firm quote for the offsite work needed to bring the water connection to your boundary.
Application fees apply, and we’ll need full payment for the connection before we can start the work.
Apply now:
We’ll help you find the right place to connect your site to our sewer network.
When you’re ready to make your bulk sewer connection, you’ll need to apply for approval to connect to our sewer (Section 106 process). You can find out more about how this process works by visiting our new sewer connections page.
You can find all the charges for NAV applications in our charging scheme.
Useful information for NAVs
Working together with NAVs
We’re here to support NAVs with reliable, cost-effective services that meet all standards — treating everyone fairly, keeping our promises, and performing at a high level.
Need help? Our dedicated NAV team is here for you.
Check out our NAV welcome pack for contact details and additional guidance if you need it.
PDF File | 9 pages | 315 KB
Contact our Developer Services team
Did you know our calls are answered on average within 29 seconds? For any questions, call us and we’ll be happy to help.