Today’s Solutions: December 17, 2025

We recently shared three signs there may be mold in your house, but did you know there’s an even quicker way to do a mold assessment of your home? This is a 30-second trick that can clue you into a potential mold problem.

Check the toilet tank

Lift up the cover of your toilet tank and look for signs of mold on the underside. Toilet tanks have minimal airflow, so a rogue mold spore that gets inside can easily colonize. This means that mold that may be invisible on your walls or ceiling will likely reveal itself inside your toilet tank.

What to do if you find mold

If you notice mold growing under the lid of your toilet tank, first start by cleaning it, then move on to addressing the larger issue. You can do an ERMI test of your home as a starting point, but if you believe you have invisible mold lurking in your home, you will probably need to invest in a full mold inspection. Also, remember that just because your toilet tank is clean doesn’t automatically mean your home is free of mold. Conduct other tests, like those mentioned in the article above, to be thorough.

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