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It's possible that you have a blockage, on the toilet line and the water is coming up in the tub to alleviate pressure. Or, your vent may be clogged causing what is called back syphonage, causing the water not to push out.

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19y ago
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18y ago

You had better get a plumber in. The sink drain and toilet drain should not be connected as waste from the toilet could bubble into the sink which couyld be extremely hazardous.

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Q: Why does the toilet bubble up when you turn on the water in the sink next to it?
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Does toilet water get reused as toilet water or tap water?

It all goes to the same treatment plant and is sent down stream to the next town or city. All tap water is the same, sink or toilet.


Water drained in the sink comes out of the bottom of the toilet?

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things that get flushed down the toilet sink bath all of that.


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A water closet or a 1/2 Bath


Why is the water in the toilet and sink brown?

There are a few reason why the water in a sink and toilet can be brown. It is possible that the pipes may be copper or galvanized, causing the water to change colors. Another reason may be that it is well water and it is not being filtered properly. Check with a local plumber for more options.


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What is a plumbing fixture?

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