I have a Caroma (Australia) eco-style toilet. There is a recurring leak around the base but ONLY when the water supply main valve is turned on.

The toilet can have water in the bowl, and water in the tank, with no leak. There is no sweating on tanks, and no leaks from any of the visible attachment points from water main, or tank-to-bowl.

I have replaced the wax seal with no change to the leak issue.

With water valve on, it takes about 2-3 minutes before I can see water collecting round the base. When I fill the tank up, and turn off the main, the tank will drain itself, I assume into the bowl, as it does not appear round the base.

The water is clear and not stinkified so don't think it has anything to do with the outgoing pipe and seal.

Any suggestions as to where/why/how this is happening and a fix?

  • just a guess, but check the inlet fitting on the tank valve. if its got a slight leak, water will drip down to the lowest point and slowly soak the ground. It can leak in two ways, either the coupler sealing the inlet pressure or externally where it pokes in to the tank reservoir. – mark f Oct 21 '20 at 17:34
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    If the tank drains when the water is turned off, then something's wrong. Check the seal between the tank and bowl – JACK Oct 21 '20 at 18:11
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    +1 for "stinkified" – Alaska Man Oct 21 '20 at 18:17
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    I would put some food coloring in the tank this may show you it is leaking to the bowl then at the seal , I have seen bad seals between the tank and bowl cause this and cracks in the tank the food coloring helps to trace the leak. – Ed Beal Oct 21 '20 at 19:46
  • Thanks responders... I've investigated most of your inputs and can find no source for leaking water on outside, anywhere. Nothing is leaking down the sides of the entire toilet at all. With no flushing involved, water just appears round the base only when the water main valve is left on for a few minutes. Puzzler. – Davo Oct 22 '20 at 12:11

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