It’s most probably was a water leak from above such as a toilet or an overflowing bathtub or something of that nature. Another cause could be a leaking roof which would cost more than even replace the toilet.
If you don’t believe it is any of the situations you don’t remember or know that there was no overflow of any kind and your roof is in good condition it might be a burst pipe summer is leaking. Just because you have a stain in a certain place on your ceiling doesn’t mean that is where the leak is originating from. You could have a pipe that is leaking from a totally different place and the water runs along the pipe and drops off at a certain point above your ceiling which means that the leak will not be directly above the water stain.
Try to remember and be aware of when the stain happened. Did it happen after a rainfall? Or was the snow melting on your roof at the time of the leak.
Do you notice that the stain is getting larger and larger over a period of time? Is it possible that your shower stall or your bathtub is not sealed properly and waters seeping down between the tiles down through the floor to your ceiling below?
If it was not a serious water leak and the integrity of the drywall and stucco if it had any is in good condition is just simply a orangey brown stain on your ceiling then it’s okay to spray some Kilz or SPS stain killers which can be sprayed on. Once the stink killer as totally dry you can repaint your ceilin
so we hope this gave you some good direction on topic of ” fix ceiling water stain“
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Mississauga, Ontario L4t2z5