More than 1,500 pupils have been sent home from the William Howard School in Brampton after problems with the water supply.
Engineers from United Utilities have been working with local contractors to try and establish the fault.
Pupils were sent home after after registration at 9.20am.
More top news
Snow and heavy rain may hamper Monday morning rush hour
Often very windy, especially as we head into Sunday, with rain or showers. Met Office 'Be Aware' warnings have been issued
The family of a Cumbrian who suffered a botched blood transfusion are furious there was no reference to compensation in the Spending Review.