Holding(s) in Company

Northumbrian Water Group PLC
21 March 2007


                          NORTHUMBRIAN WATER GROUP PLC

                               HOLDING IN COMPANY


                    NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the        Northumbrian Water Group plc
underlying issuer of existing shares to
which voting rights are attached

2. Reason for the notification          Disclosure triggered by the
                                        implementation of the Transparency
                                        Directive with new 5% disclosure
                                        threshold

3. Full name of person(s) subject to    Pictet Asset Management SA
the notification obligation

4. Full name of shareholder(s) (if      As above
different from 3)

5. Date of the transaction (and date on N/A
which the threshold is crossed or
reached if different)

6. Date on which issuer notified:       21 March 2007

7. Threshold(s)that is/are crossed or
reached:                                5%

8. Notified details:                    None disclosed

A: Voting rights attached to shares
Class/type   Situation previous to    Resulting situation after the Triggering
of shares if the Triggering           transaction
possible     transaction
using the    Number of Number of      Number Number of voting     % of voting
ISIN CODE    Shares    Voting Rights  of     rights               rights
                                      shares

                                      Direct Direct Indirect      Direct Indirect
Ordinary     N/A       N/A               0      0    37,040,370      0    7.142
shares
GB0033029744

B: Financial Instruments
Resulting situation after the triggering transaction
Type of      Expiration Exercise/     Number of voting rights that may   % of
financial    Date       Conversion    be acquired if the instrument is   voting
instrument              Period/Date   exercised/converted                rights


N/A          N/A        N/A           N/A                                N/A

Total (A+B)
Number of voting rights                      % of voting rights
37,040,370                                   7.142

9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable

Not applicable. No controlled undertaking individually holds 3% or more of the
voting rights.

Proxy Voting:
10. Name of the proxy holder:        Pictet Asset Management SA

11. Number of voting rights proxy holder will cease to hold:         37,040,370

12. Date on which proxy holder will cease to hold voting rights:  None disclosed

13. Additional information:      None disclosed

14. Contact information:         Jayne Powell, Northumbrian Water Group plc

15. Contact telephone number:    0191 3016704




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