Transaction in Own Shares

Pennon Group PLC
13 August 2007

Pennon Group Plc announces that it has today purchased through Credit Suisse
(Securities) Europe Limited 167,000 ordinary shares at a price of 588.43 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 3,138,909
ordinary shares in treasury and a total of 352,025,365 ordinary shares will be
in issue (excluding shares to be held in treasury).


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