How do I find the leakage from the bathroom?

Our upstairs bathroom is leaking, into the downstairs. We can't find where the leakage.

  6 answers
  • Dfm Dfm on Jan 08, 2018
    water can travel away from where the leaking starts. try coloring the the tank and bowl water with food coloring. where it leaks that color should show.

  • Lisa S. Lisa S. on Jan 08, 2018
    Turn off each fixture at the pipe. Turn on each plumbing fixture individually and see what happens. You may not want this answer, but you may need to remove some of the ceiling to check the pipes under the tub. Lots of time that pipe starts to leak.

  • Sharon Sharon on Jan 08, 2018
    Use a moisture meter on the ceiling below to find the wettest spot, then cut a 1 foot square hole in the drywall to do a plumbing repair.
    If you are hiring a plumber to repair your leak, he will do it for you. You will have to do the repair after he's done. Its not hard.

  • William William on Jan 08, 2018
    I agree with Lisa. Cut a small inspection hole in the downstairs ceiling and look around with a flashlight. A hole about 4" square should be sufficient. The cut off then can be replaced and patched once the leak is repaired.

  • Dfm Dfm on Jan 08, 2018
    sorry had to take a call, if its not the commode, next the sink, again fill with water but a different color from the toilet. then fill tub give it its own color.

    there might be a bit of staining, a quart of kilz should get it. had to do this to find the leak in my place. new toilet seal fixed the issue.

  • C.B. C.B. on Jan 08, 2018
    ooowww! most often I have found that a bathroom leak that is hard to find is in 1 of 2 places....the toilet floor seal needs to be replaced or there is a hose connection leaking...sometimes right at the toilet tank...maybe under the sink? Usually a toilet floor seal will leak due to the floor anchors loosening up or coming totally off their floor plate; in which case, check them to see if they are tight. If the toilet moves at's the seal that needs to be replaced. If the toilet shifts instead of standing firm, you can try re-securing the floor anchor bolts to see if that will take care of the leak; if it doesn't...replace the seal. Look at the bottom of your toilet tank where the water hose connects...feel for any wetness...if you find wet, tighten the connection; BUT if the leak is coming from around the hose's metal band...replace the entire hose. Also check where that same hose connects to the water supply hose near the may need tightening or replacing.