More than 1,200 pupils returned to Chipping Norton School this morning after contractors fixed a burst water main.
Students were given the day off yesterday, as there was no water supply for the kitchens, toilets or sinks.
A spokesman for the school said: "We have managed to sort out all the problems."
Pupils at Greenmere Primary School, in Mereland Road, Didcot, were also back in class today. They were off school yesterday due to another burst water main.
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