Cymal 14 – Rhaid i’r Awdurdod Cystadleuaeth a Marchnadoedd (CMA) ofyn i Ofwat am farn, a rhaid i Ofwat roi barn, ar effaith uno cwmnïau ar allu Ofwat i reoleiddio ac ar faint yr effaith honno o’i chymharu â’r manteision posibl i gwsmeriaid. (Daw’r uno y cyfeirir ato yma o dan yr uno arbennig yn adran 32 i 35 o Ddeddf y Diwydiant Dŵr.) Wrth wneud yr asesiad hwn, rhaid i Ofwat ddefnyddio’r dulliau a nodir yn y datganiad dulliau sy’n ofynnol o dan yr adran 33C newydd. Bwriad Llywodraeth y DU yw y dylai’r datganiad roi rhywfaint o sicrwydd i ymgymerwyr sy’n caffael, ac i’r CMA, ynglŷn ag a fyddai uno arfaethedig (gan gymryd i ystyriaeth unrhyw ymgymeriadau a gynigir o dan yr adran 33D newydd) yn tanseilio gallu Ofwat i reoleiddio ac effaith debygol tanseilio. Rhaid i’r CMA ystyried barn Ofwat cyn dod i benderfyniad.
Clause 14– The Competition and Markets Authority (CMA) must ask Ofwat for, and Ofwat must give, an opinion on the impact of a merger on Ofwat’s ability to regulate and how that weighs up against potential customer benefits. (The merger referred to here is under the special merger in section 32 to 35 of the WIA.)  In making this assessment, Ofwat must apply the methods set out in the statement of methods required under new section 33C. The UK Government’s intention is that the statement should give acquiring undertakers and the CMA some certainty about whether a proposed merger (taking into account any undertakings proposed under new section 33D) would prejudice Ofwat’s ability to regulate and the likely impact of prejudice. The CMA must consider Ofwat’s opinion before coming to a decision.