It is difficult to say, because of the lack of information and were the water enters your Peugeot 206. Should it be into the cabin, I would check all your door seals. If it is entering via the bottom it would point to corrosion, in that case you need to get under the vehicle, whilst observing all the safety precautions.. I hope that this helps, if not, please, send more trouble shooting information.
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It is difficult to say, because of the lack of information and were the water enters your Peugeot 206. Should it be into the cabin, I would check all your door seals. If it is entering via the bottom it would point to corrosion, in that case you need to get under the vehicle, whilst observing all the safety precautions.. I hope that this helps, if not, please, send more trouble shooting information.