black mold in toilet tank

Have you ever noticed some toilets get more moldy than others? Even if you clean your toilet weekly, that black mold in your toilet tank keeps coming back!

What Causes Black Mold in Toilet Bowl?

Mold spores thrive in dark, damp places so it’s only natural to find mold in your toilet. However, some toilets can become moldier than others depending on your water or if you have calcium deposits built up in your toilet.

I’ve even heard that if your body has higher glucose levels from diabetes, your excrement can cause additional toilet mold!

stop toilet mold

Stop Mold From Growing in Toilet Tank

Note: The links below are to Amazon. When you click through and purchase a product I receive a small compensation at no extra cost to you. The money I receive goes to helping me keep this blog live and filled with helpful DIY information. Thanks for your support!

While cleaning your toilet is a necessary part of life, there are several hacks that can help eliminate a few of the common causes of mold.

Before you do anything, clean your bowl like usual. I try to avoid chemicals as much as I can so I like to use natural cleaners, like Lemi Shine or this one.

Be sure to thoroughly flush the cleaner out of the toilet since you don’t want it to react with the next product.

Next, check to see if there is black mold in the toilet tank, the area behind the toilet bowl. If you notice mold in there you will need to treat it first since that is probably what is causing your chronic moldy toilet.

I’ve had a few friends tell me they’ve had success using Lime-A-Way Toilet Bowl Cleaner to your toilet tank in order to eliminate any mold buildup within the hidden recesses of your toilet. This way every time you flush a little Lime-A-Away is sent swirling through your toilet bowl to keep black mold from growing in the toilet. But keep in mind, it is a toxic chemical product and should be used as a last result to stop moldy toilets.

If you don’t see any mold buildup in the toilet tank, try using a Fluidmaster automatic toilet bowl cleaner. It’s made for the toilet tank (that way you avoid causing any damage to your toilet).

what causes black mold in toilet

Natural Solutions for Toilet Mold

Looking for a more natural solution to moldy toilets? Try adding the Better Life toilet bowl cleaner to the toilet tank. It’s not as effective as the others mentioned above but it does slow the growth down.

Warning: Do NOT scrub your toilets with a metal or steel wool pad!

When we first moved into our house, I gave our toilets a good scrub but just couldn’t get a hard water line off of the toilet bowl so I used an SOS pad– BAD IDEA! It turned the inside of the toilet bowl grey!

Instead use this pumice stone to get any hard water stains off your toilets.

Interested in renovating your bathroom on a budget? Check out my gorgeous bathroom renovation here!

Updated: September 6, 2021.