10 February 2023

Northumbrian Water Finance Plc

Publication of Final Terms

The following final terms (the "Final Terms") are available for viewing:

Final Terms dated 10 February 2023 in relation to the £350,000,000 4.500 per cent. Notes due 14 February 2031 (ISIN XS2585804946) (the "Notes") issued by Northumbrian Water Finance Plc (the "Issuer") and guaranteed by Northumbrian Water Limited (the "Guarantor") under the £6,000,000,000 Euro Medium Term Note Programme (the "Programme") of Northumbrian Water Finance Plc.

To view the Final Terms, please paste into the address bar of your browser or click on the following URL:

http://www.rns-pdf.londonstockexchange.com/rns/6367P_1-2023-2-10.pdf

A copy of the Final Terms has also been submitted to the National Storage Mechanism and will shortly be made available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism

For further information, please contact:

Dean McDonald

Assistant Group Treasurer

Email: [email protected]

DISCLAIMER - INTENDED ADDRESSEES

The Final Terms complete the Base Prospectus dated 19 October 2022 (the "Base Prospectus") with regard to the terms of the Notes. Please note that the information contained in the Base Prospectus as completed by the Final Terms may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Base Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the information contained in the Base Prospectus is not addressed. Prior to relying on the information contained in the Base Prospectus you must ascertain from the Base Prospectus whether or not you are part of the intended addressees of the information contained therein.

Your right to access this service is conditional upon complying with the above requirement.

Neither this announcement nor the publication of the Final Terms constitutes an offer of the Notes described in the Base Prospectus for sale in the United States. This is not for distribution in the United States. The Notes have not been, and will not be, registered under the United States Securities Act of 1933, as amended (the "Securities Act") and are subject to U.S. tax law requirements. Subject to certain exceptions, Notes may not be offered, sold or delivered, directly or indirectly, in the United States or to, or for the account or benefit of U.S. persons, as such terms are defined in Regulation S under the Securities Act. There will be no public offering of the Notes in the United States.