The Blue Coat School in Oldham has confirmed that it is closed today (Friday) because there is no water supply.
In a message sent to parents by head teacher Robert Higgins, the Egerton Street school said it had "no alternative" but to close and the issue seems to be an isolated one at the school.
United Utilities are investigating the problem but it has forced the school to cancel some exams for Year 13 students, with pupils asked to stay away today.
It read: "Unfortunately we are going to have to close the school today as we have no water.
"United Utilities have been on site since 7.30am and the problem seems to be solely related to the school as surrounding areas have water.
"Without water we can’t provide the children with any food or toilet facilities so regrettably we have no alternative but to close.
"The Year 7 school trip will carry on as normal and the pupils will be back at school for 3.20pm as planned. Year 13 exams will be cancelled and rearranged.
"All students will be set work via Bloodle and homework blocks so please ensure that they complete this. Any students that are struggling to get home we will be supported in the hall until they can make any arrangements."
Blue Coat is a mixed gender Church of England academy for 11 to 18 year olds.
It remains to be seen if the school will be able to re-open on Monday.