Why Is My Toilet Seat Turning Blue? The 6 Main Reasons

“Why is my toilet seat turning blue?” If you have found yourself pondering this peculiar question, you’re not alone!

There are plenty of reasons to turn your toilet seat blue. These can include sitting on the seat after wearing denim jeans, the effects of chromhidrosis (or eccrine chromhidrosis), having a high level of Copper in water, mold buildup, or using cleaning products that contain blue dye. Discovering unexpected hues on your toilet seat can be both puzzling and intriguing.

In this engaging exploration, I will delve into the diverse reasons that could cause a distinct blue tint on your toilet seat. So, fear not, as we are about to unravel the mystery behind this curious phenomenon.

Why Is My Toilet Seat Turning Blue? The Main Reasons

Turning your toilet seat blue is not common. When you notice such an incident, don’t panic. Instead, try to figure out the exact cause by comparing your scenario with the following events.

Denim Jeans

Some denim jeans are dyed with a chemical called indigo dye. Indigo dye is commonly used to give jeans their blue color. It is likely that the dye from your jeans has transferred to your thighs.

So, if pregnant women wear denim jeans, they can accidentally transfer some of the dye to the toilet seat when sitting down. It can lead to the toilet seat turning blue. In such cases, try wiping the stain off the toilet.

If it doesn’t come off easily, there could be another reason behind the discoloration.


Chromhidrosis is a rare condition where a person’s sweat is colored. Often, this condition is most prevalent during adolescence, when the apocrine glands start producing secretions.

However, it can persist into adulthood. While Chromhidrosis is not physically harmful, it can cause emotional distress as the colored perspiration is easily visible to others.

In the case of chromhidrosis, the sweat does not change color on the skin. However, the color may change when it comes into contact with certain surfaces, like a toilet seat.

If a person with this condition sits on a toilet seat, their colored sweat can stain the seat and turn it blue.

Read: How to Install a New Toilet

Natural Oils And Sweat

To some extent, your body’s natural oils and hormones are responsible for the blue stains on your toilet seat. In certain cases, individuals may experience a condition called eccrine chromhidrosis, where colored sweat is released from their sweat glands. The sweat color may vary and not always be blue.

However, blue sweat, in particular, has the potential to stain the toilet seat.

Moreover, during pregnancy, hormonal changes in women can also lead to blue stains. Often, pregnant women who carry a boy have higher concentrations of testosterone. These elements in the human body can contain compounds that react with certain materials, including toilet seat materials or cleaning products.

Over time, this can cause a blue discoloration.

Water Conditions

In areas where the water supply contains high levels of copper, the toilet seat may turn blue. Moreover, water may take on a blue hue if it leaches copper from copper pipes. Most likely, it can happen due to a chemical reaction.

Although this situation is generally not considered hazardous, it is advisable to have your water tested. Copper can react with chemicals in cleaning products, natural oils, and sweat on the skin. Blue stains on the seat may result from this.

Read: How To Remove a Toilet by Yourself


Mold is a common issue in damp environments like bathrooms. Some types of mold can have a bluish appearance. If such mold grows on or beneath the toilet seat, it can give the appearance of a blue stain.

Plus, the presence of mold spores can pose health risks to the occupants of your home. This occurrence is more common when the seat isn’t cleaned regularly or if it remains exposed to moisture on a frequent basis.

In such cases, it is advisable to replace the toilet seat with a new one.

Cleaning Products

Certain cleaning products can react with the materials used in toilet seats. Most of the time, such products contain bleach or other strong chemicals. This reaction can result in a blue discoloration of the seat.

Some toilet cleaning products contain blue dye that imparts a pleasing blue color to the toilet water. While this blue dye effectively serves its purpose, it can inadvertently lead to bothersome blue stains on the toilet seat. So, be cautious while using blue toilet tablets.

How To Prevent My Toilet Seat From Turning Blue

Now that you have learned the reasons behind “Why is my toilet seat turning blue?” It is time to learn how to fix this issue.

Let’s explore in detail how the following methods can prevent the blue discoloration of your toilet seat:

Rubbing Alcohol

For this method, soak a cloth or cotton ball with rubbing alcohol first. Then, gently rub the toilet seat with this cloth or cotton ball to remove any dye or stain residues.

Rubbing alcohol is effective in breaking down and removing stains. This can remove stains caused by dye transfer from clothing or other sources.

Using Baking Soda And Vinegar

Baking soda and vinegar are natural cleaning agents for removing stains from the toilet seat. Here’s how to use them:

  • Create a paste by mixing baking soda with vinegar.
  • Try to maintain a thick consistency while creating the paste.
  • Next, apply the paste to the stained areas of the toilet seat. Let the paste sit for several minutes to work on the stain.
  • Scrub the stained areas with a sponge or soft-bristled brush.
  • After that, rinse off the paste thoroughly with water.

Diluted Bleach Solution

Bleach is a powerful disinfectant that can remove stains and kill mold. As a result, this will prevent mold or mildew from creating a blue discoloration on your toilet seat.

  1. Start by mixing bleach with water to make a diluted solution.
  2. Use a diluted bleach solution to clean stained areas of the toilet seat. Let the solution sit for a few minutes.
  3. Use a toilet brush or sponge to gently scrub the stain.
  4. Finish by giving the bleach solution a good water rinse.

As a safety precaution, you should wear gloves and ensure proper ventilation when handling bleach.

Read: How to unclog toilet when nothing works

Toilet Cleaners

You can always use a commercial toilet cleaner designed to remove stains and discoloration.

  • Following the product’s instructions, apply the cleaner to the stained areas.
  • Allow the cleaner to sit for the recommended time.
  • Next, use a toilet brush or sponge to scrub the stains.
  • Use water to fully rinse the cleaner off.

New Color

If the above methods don’t work, you might consider painting your toilet seat a different color. While repainting your toilet seat, opt for a color other than white.

The blue stains will be less noticeable in other colors. Ultimately, the issue of blue discoloration can be successfully prevented.

Bonus: New Toilet Seat

This is a bonus method for preventing blue color from your toilet seat. It involves replacing the toilet seat with a new one.

If the blue discoloration persists despite trying various cleaning methods, this is the only option you have. However, you must have the finances to buy a new toilet seat. A new toilet seat will ensure a fresh and clean appearance in the bathroom.

Just as I said to ignore white when repainting, you should also ignore a white toilet seat.

The Myths Regarding Blue Toilet Seats

Still, wondering why is my toilet seat turning blue. Well, the above are the actual reasons. The rest you hear like the following are just myths.

Myth 1: Pregnancy hormones

Okay, the first myth on my list is the idea that blue toilet seats are a result of pregnancy hormones. It is true that hormonal changes during pregnancy can lead to various physical and physiological changes in a woman’s body.

However, there is no scientific evidence linking pregnancy hormones to the discoloration of toilet seats.

The myth appeared as many pregnant women reported their toilet seats turning blue, attributing it solely to their pregnancy. As there has been limited research conducted on this topic, many experts consider this claim to be a myth.

Myth 2: Indicates Potential Cancer

There is no scientific basis to suggest that blue toilet seats are an indication of potential cancer. Cancer is a complex disease with various types and risk factors. The color of a toilet seat has nothing to do with cancer development or diagnosis.

With that said, there is a new invention called the “Smart Toilet,” developed by Saniv Gambhir, a Ph.D. from Stanford University. This special toilet can analyze urine and stool samples in the bowl to detect potential diseases like urologic issues, colorectal problems, and even cancer. It uses advanced technology to identify markers that may indicate these illnesses.

Myth 3: A Sign Of Diabetes

There is no established connection between blue toilet seats and diabetes. Diabetes is a metabolic disorder that affects blood sugar levels. It can have various symptoms, such as frequent urination, increased thirst, and unexplained weight loss.

However, the color of a toilet seat is not an indicator of diabetes or any other medical condition related to the disease. There’s not enough scientific information on the possibility of diabetes due to the toilet seat turning blue..

Myth 4: Vitamin B12 Or Cobalt

The belief that blue toilet seats are caused by excess vitamin B12 or Cobalt intake is not supported by medical evidence. Vitamin B12 is an essential nutrient that plays a vital role in the body’s metabolism. But it does not cause toilet seats to turn blue.

Similarly, Cobalt is a naturally occurring element found in some foods, which is not responsible for toilet seat discoloration.

However, if you are taking B12 supplements, you might observe that your urine becomes a brighter yellow than usual.

Don’t worry; this change in color is normal. It happens because of how the supplement affects your body. So, taking vitamin B12 or cobalt will turn your toilet seat blue is nothing more than a myth.

Bottom Line

Understanding the reasons behind the question, “Why is my toilet seat turning blue?” empowers us to take effective measures to prevent or address the issue.

Overall, knowledge is the key to maintaining a pristine and stain-free bathroom environment. By being aware and proactive, we can have a toilet seat that stays as fresh and clean as it should.

Leave a Comment