Pennon Group PlcLSE: PNN

Ofwat Investigation – leakage and PCC

PENNON GROUP PLC

23 May 2023

Ofwat investigation into leakage and per capita consumption data

Ofwat have this morning announced an investigation into South West Water's 2021/22 operational performance data relating to leakage and per capita consumption.

This operational performance data was reported in South West Water's Annual Performance Report 2021/22. This report is subject to rigorous assurance processes which include independent checks and balances carried out by external technical auditor.

We will work openly and constructively with Ofwat to comply with the formal notice issued to South West Water as part of this investigation.

For further information, please contact:

Pennon Group plc

+44 (0) 1392 443 168

Paul Boote

Group Chief Financial Officer

Jennifer Cooke

Group Head of Investor Relations

Media Enquiries - FGS Global

+44 (0) 20 7251 3801

James Murgatroyd

Harry Worthington