Alpheus Environmental Limited Anaheim Public Utilities Anglian Water Services Limited Aquarion Company AWG Plc
Biwater Plc Board of Water Commissioners, City and County of Denver, Colorad Bournemouth and West Hampshire Water Plc Bristol Water Group plc
Cambridge Water PLC Companhia de Saneamento de Minas Gerais
Dee Valley Group plc Degrémont
East Bay Municipal Utility District Enpure Limited
Folkestone and Dover Water Services Ltd.
Glas Cymru Cyfyngedig
Indianapolis Water Company
Kelda Group Limited
Macao Water Supply Co. Ltd. Mediterranea delle Acque
Nature Group PLC Northumbrian Water Group plc
Pennon Group Plc Pennsylvania-American Water Company Portsmouth Water Limited
San Antonio Water System San Diego County Water Authority San Jose Water Company Scottish Water Severn Trent Plc Severn Trent Services Sociedad General de Aguas de Barcelona, S.A. Società Azionaria per la Condotta di Acque Potabili SpA South East Water (Holdings) Limited South Staffordshire Plc South Staffordshire Water PLC South West Water Limited Southern Water Services Limited Suffolk County Water Authority Sutton and East Surrey Water plc
Tendring Hundred Water Services Ltd. Thames Water Holdings plc
United Utilities Group PLC United Water Inc. United Water International Utilities, Inc.
Veolia Water Central Limited Veolia Water North America Operating Services, Inc.
Wessex Water Services Limited
Yorkshire Water Services Limited