Ers i ddeddfwriaeth ynghylch cronfeydd dŵr gael ei chyflwyno gyntaf, nid oes unrhyw un wedi marw oherwydd methiannau cronfeydd dŵr. Eto i gyd, dros y blynyddoedd diwethaf, mae achosion wedi codi lle gallai marwolaethau fod wedi digwydd petai’r cronfeydd dŵr wedi methu. Cyflwynodd adroddiad Syr Michael Pitts ar lifogydd 2007 yn Lloegr 92 o argymhellion, gan gynnwys diweddaru’r ddeddfwriaeth ynghylch diogelwch cronfeydd dŵr.
Since reservoir legislation was first introduced, there has been no loss of life through reservoir failure, however, in recent years there have been a number of near-miss incidents where lives could have been lost if the reservoir had failed. Sir Michael Pitts report on the 2007 floods in England made 92 recommendations including updating reservoir safety legislation.