Black mold in the toilet bowl: reasons and how to get rid of this issue?

A beautiful, clean washroom not only helps to reduce your stress but also ensures the good health of yourself and your family. But one day, you notice some black color spots in the toilet bowl and tank. Don’t panic; this is just mold, and you can easily clean this from your toilet. You must know how to clean your bathroom, and then you can quickly get a spotlessly clean toilet. In this article, you will learn about the reason for this black mold and how to get rid of this. 

Reasons Health IssuesFixesPreventions
  • Fungus (Stachybotrys chartarum)
  • Humidity
  • Lack of light
  • Poor ventilation
  • Drywall
  • Coughing
  • Sneezing
  • Headache
  • Skin & eye irritation
  • White vinegar
  • Bleach solution
  • Baking soda & vinegar solution
  • Powerful toilet cleaner
  • Make proper ventilation
  • Let the sunshine or light in
  • Regular cleaning
  • Lower the humidity level

What is black mold?

You can find a black ring-shaped spot inside the bowl or tank of the toilet. This thing turns your comfort place into a nightmare. This is called black mold, which gets glucose-rich fluid as food. This mold is one kind of fungus. Mold loves to spread into humid and dark areas. So when you leave the house for a few days, the toilet remains unused. It has water in its bowl and tank. This is the best type of place for mold. Sometimes it is also seen in the pipes. When your toilet has rust on the line, it’s also a reason for black mold there.

What causes black mold in the toilet bowl?

If you have any idea about fungus, you must know it loves the higher humidity area. And this is an easy airborne mold that takes root in a toilet when you are left open most of the time. When you go on a long vacation, your toilet is left unused, and you find black mold there. This problem also occurs if any waste remains in the bowl for a period. So you know that the breeding place of this fungus is dark and humid. You get more prominent if the ventilation system is awful.

What health issues do you face with black mold?

Black mold is well known for its poisonous characteristic. If you think this toilet ring only gives an irritating look in the toilet, you are wrong. These are very poisonous to health. The fungus has mycotoxins, and it’s a toxic substance. This mold is the reason for various issues like aches with pain, mood changes, headaches, nose bleeds, etc. These are the result of mycotoxins.

And if anyone has allergies, this is a red alert for you. You can often face a blocked or runny nose, red eye, dry cough, rashes on the skin, wheezing, etc. And if you don’t clean it immediately, your health worsens daily.

How to get rid of black mold from the toilet bowl and rim?

After knowing the health issue of this black mold, I think now you must know how to remove this ring from the toilet. To remove the mold from the bathroom naturally, you need some essentials, like:How to Remove Mold From a Toilet

  • Cleaning gloves and mask,
  • Toilet scrubber,
  • Sraybottole,
  • Vinegar,
  • Toilet bowl cleaner,
  • Bleach, etc.

The natural cleaning process parts in two ways: clean the bowl and toilet water tank separately. So the process is also different from each other. So the cleaning process f these two-part is as follows:

Cleaning the black mold from the toilet bowl:

Start with the bowl of the toilet. First, remove excess water from the bowl. Then start scrubbing with your scrubber or pumice stone and spray vinegar in the affected area with a spray bottle. You left the place to rest for a while. Then again, scrub if the ring is still in there. Repeat the previous step until the mold properly comes off from the bowl. After that, flush the toilet a few times so that the vinegar washes off from the bowl properly.Cleaning Mold in Toilet Bowl

How you can get rid of black mold from the toilet tank:

Let’s clean the toilet bowl now. For the first step, pour bleach directly into the tank and rest it for 20 to 30 minutes. The water and bleach ratio depends on the size of the tank. You can learn it from Google or follow the instructions on the bleach packet. I usually use one cup of bleach for one gallon of water. Then use your scrub, too but be careful not to dump any of the molds in the tank if you want to bump the float or anything like that. After scrubbing the toilet, flush it several times to clean all the mess. Then clean that mess up and dump the gloves and any brushes you use there. If you stick with that, returning the mold spores on them is possible. So get rid of all of them.

How to Remove Mold From a Toilet Tank

How to stop mold from growing in the toilet?

If you don’t like this situation, you must follow some strict but easy rules. Like:

  1. If your toilet has windows, open them up for proper ventilation. If there is an exhaust fan, it also helps to ensure adequate ventilation in the bathroom,
  2. Ensure you flush the waste correctly and that no debris is left in the bowl. If there remains anything, then rinse again to clean the bowl.
  3. Clean the toilet regularly,
  4. Add vinegar to the toilet once a month so that no mold grows in the pipeline,
  5. Before going on an extended vacation, shut down the tank’s water supply tank.


As I told you before, any type of mold is not suitable for health. You must take care of this issue after noticing it in the washroom. Or it will make a significant health issue in the future. Always try to clean your bathroom regularly. A clean and well-ventilated toilet always remains free from any fungus.

We are really lucky to have a hard-working, multi-skilled plumber on our team. Collin D. Gallegos, a professional plumber who has worked with us since 2012, is an expert in vent, septic, and drainage systems. He is a Certified Master Plumber and has worked on various commercial plumbing projects. He usually helps our readers resolve plumbing and pipe-related issues with a proper DIY troubleshooting and repair guide.

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