Yes in some instances you get condensation on a toilet cistern (eg after shower or bath particularly in bathrooms not fitted with an extractor fan to take away steametc).
However if you have a close coupled toilet & cistern (tank sits on top of back of toilet) check between the two it could be the rubber seal gone. Or if you have a toilet with a pipe between the two parts check where the pipe goes into the back of the toilet.
To see if water is condensation or not try putting a 'blue loo' block in the cistern. Ensure you cover anything you want to protect from staining & flush the loo a few times. If the water is from a leak you will be able to trace the blue water trail back to where it is coming from.
Robin S
September 2008
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