Transaction in Own Shares

Pennon Group PLC
17 August 2007

Pennon Group Plc announces that it has today purchased through Credit Suisse
(Securities) Europe Limited 246,354 ordinary shares at a price of 546.85 pence
per share.



The purchased shares will all be held in treasury.  Following the above purchase
and non-cancellation of such equity shares, Pennon Group Plc will hold 4,135,263
ordinary shares in treasury and a total of 351,029,011 ordinary shares will be
in issue (excluding shares to be held in treasury).


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