When I turn on the water to the sink, it sends water to the tub & shower, why would this happen?

  • Can you provide more information: type of residence (house or apartment), your location, are both hot and cold water involved?, how long has this been going on?, etc. – Barry Jan 4 '20 at 23:31
  • Also, does it happen the other way around at all? If you're running the shower, does anything come out of the sink? – cutrightjm Jan 5 '20 at 7:33

If you are talking about water backing up in the drains there is a down line obstruction and a snake or jetting may be required as the problem normally continues to get worse until totally plugged.

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