Warning comes as Western Europe experiences a heatwave, with temperatures reaching highs not expected until the summer.
The burst water main in Cirencester comes days after a similar situation in Bourton-on-the-Water.
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Heatwave latest: Experts warn of 'very real risk' of swimming in open water - as fifth child dies
The record for the UK's hottest May day was broken for a second day running yesterday, but temperatures are starting to cool.
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