Why Is There Mold in My Toilet Bowl: How to Tackle the Issue

If you are wondering why there is mold in my toilet bowl and tank, you should realize that you don’t clean your toilet regularly – at least, not as often as you should. Mold or fungus will grow in humid and warm places and not be periodically brushed or cleaned.

So, if you encounter such a mold problem in your toilet, there is no need to worry. You can learn about the causes and how to deal with it.

What Causes Black Mold in Toilet Bowl

Here’s the thing: mold thrives in ideal conditions that they love. As a fungus, mold likes it when it’s warm, dark, and moist. Toilets are perfect for mold to grow. Take a look at your toilet.

If you have little ventilation in your bathroom, your toilet is often damp and typically placed in a warm spot within the house. It’s not really a surprise if you find mold in the toilet bowl.

why is there mold in my toilet bowl

But the real reason why you find mold is the not-so-regular cleaning. The spores of the mold are everywhere. It’s so easy for them to be trapped within the toilet seat and bowl’s crannies and nooks. Whenever the spores make contact with the moisture, they will multiply and grow.

Food sources for mold also include organic matter in the water and mineral deposits, which can accumulate in less visible areas, making thorough cleaning essential.

It’s also possible that there are leaks around the toilet. Leaks are also the common cause of mold growth. When there is a persistent or slow leak, it leads to the creation of perfect conditions. Mold has this perfect condition to grow.

Faulty gaskets or seals are often responsible for toilet leaks. If you often ask yourself why there is mold in my toilet bowl, well, here are the answers.

Is It Bad to Have Mold in Your Toilet?

Black mold isn’t the only type of mold that you can find in toilets. Unfortunately, toilet mold is known to be unsanitary. With the combination of the toilet (known to be one of the most disgusting spots in a house) and dangerous spores, you can have health hazards.

Basically, mold can be harmful to humans, especially for health. When you are exposed to mold for a long time, it can lead to ailments. Knowing how to remove or prevent the mold is a smart thing to do.

How to Get Rid of Mold in Toilet

You don’t always need chemicals to remove the mold. You can start with natural substances that are easily found at home. But remember, you need to wear a mask, goggles, and gloves. Spores are airborne, so it’s easy to inhale them when you don’t wear all of these things.

To clean the bowl and under the seat, fill in the water in the tank and then flush your toilet. Your toilet bowl shouldn’t have any excess water. Sprinkle baking soda to your bowl and tank. Prepare vinegar and a scrubber in a spray bottle.

Spray the vinegar and let it be for a while. You can now scrub the mold until it is removed. Repeat the steps until you remove all of the black mold’s spots. Finally, flush the toilet so the bowl is free of any remaining vinegar or cleaner.

To clean the tank, pour a cup of bleach into it. Let it be for 30 minutes. Wash the tank using a toilet brush.

Read also: Why is My Toilet Bubbling When the Shower is Running?

Be careful because you don’t want to damage the components with the brush. Clean the toilet lid’s underside, too. Flush your toilet several times so the waste can be effectively removed.

After you finish the cleaning task, ensure you get rid of everything, including your goggles, gloves, brush….everything! They may have mold spores, and you don’t want to risk it. Take a shower and clean yourself thoroughly.


As you can see, dealing with the issue isn’t all difficult. Now that you know why is there mold in my toilet bowl, you can solve the problems and find out ways to prevent it.

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John Burns is an experienced author and expert home improvement advice. With years of practical experience in the field authored several informative articles on various aspects related to home improvement, including installation, maintenance, and repair.