Loo Academy

Mushrooms Growing in the Bathroom: Why & How to Prevent It

Mushrooms, dark green and sometimes black, can grow in your bathroom in various sizes and patterns.

These fungi typically thrive in the moistest areas—around the shower grout, shower drain, bathroom walls, and bathroom floor corners.

Beyond their unsightly appearance, a musty odor often signals their presence.

Since mushrooms are a type of mold, it is crucial to remove them to prevent harmful health effects.

Discover effective strategies for removing mushrooms from your bathroom and preventing their regrowth.

bathroom mushroom

Why Is There a Mushroom Growing in the Bathroom

Mushrooms are fungal spores, tiny single-celled organisms present in the air, clothing, window screens, plants, and many other places.

Having mushrooms in the bathroom is a clear indication of three things: your bathroom has insufficient lighting, high heat, and high humidity.

These conditions support single-celled organisms to come together, start germinating, and form mushrooms as you see them in the bathroom.

If your bathroom has these three factors, you bet that mushrooms will start growing.


All types of molds, including fungi like mushrooms, thrive where they can find water for growth and nutrition.

It’s why the bathroom is the perfect area for them, especially the shower area which often gets pretty damp.


Mushrooms grow where it’s warm, typically between 77 to 86 degrees. They will not grow if the temperature is below 40 degrees.

Therefore, if your bathroom is usually warm, for example when there’s a heater working or when you often like taking long hot showers, mushrooms are more likely to grow there.

Insufficient Lighting

Low lighting isn’t directly related to mushrooms growing in the bathroom.

Nevertheless, darker areas have higher humidity.

Hence, damp nooks and crannies in the bathroom make a suitable breeding ground for mushrooms.

Where Can You Usually Find Mushrooms Growing in the Bathroom

Like all types of mold, mushrooms in the bathroom grow in areas with low light and those that stay moist and warm.

Given the right conditions, mushrooms can grow anywhere in your bathroom.

But you can usually notice them growing from the bathroom floor and walls, especially on the tile grout.

They can also grow on bathroom ceilings, especially if the ceiling is old and damp.

Mushrooms thrive in damp areas, so they are also common in shower areas, especially on the shower drain.

A leaking toilet also makes an attractive place for mushrooms to grow in the bathroom.

Are Mushrooms Growing in the Bathroom Dangerous?

There are many kinds of mushrooms that can grow in the bathroom.

While plenty of them are harmless, some are incredibly dangerous when inhaled or ingested.

Poisonous mushrooms can cause shortness of breath, other respiratory issues, and in severe cases even death.

But generally, mushrooms do not pose a significant risk to health.

The real danger about having mushrooms growing in the bathroom comes from accompanying threats.

Where mushrooms grow, there’s a huge risk that it also serves as a breeding ground for more harmful mold growth like black mold.

And where this mold and mildew can flourish, you expose yourself to risks like severe respiratory illness and serious allergic reactions.

For this reason, it’s always smart to choose the safest route and get rid of any mushrooms in the bathroom, whether they are a health hazard or not.

How to Get Rid of Mushrooms in the Bathroom

As soon as you notice mold and mushrooms growing in the bathroom, act right away before they spread widely.

And no matter what remedy you use, don’t forget to wear gloves, a mask, and other protective gear.

Pick the Mushroom Off the Bathroom Surface

The initial removal of mushrooms that have already grown large is as simple as picking them up off the bathroom floor, wall, or ceiling.

But remember, use gloves when picking the mushrooms up.

Never use your bare hands in handling any type of mold or fungus as it may be toxic.

Use Bleach Chloride on Tiled Walls

Once you’ve removed larger mushrooms growing in the bathroom, it’s important to clean the area to get rid of any remaining mushroom spores.

Clean the bathroom using a 1:3 bleach to water solution, spraying the cleaner before cleaning affected areas with a brush.

Alternatively, you can use fungicide cleaning solutions that not only kill fungi residue but also mold and mildew bacteria, preventing mushrooms growth in the future.

To eliminate fungus and prevent future growh
RMR-141 Disinfectant Spray Cleaner and Fungicide
$16.99 ($0.53 / Fl Oz)
This solution will help you clean any bathroom surface off of fungus residue. It also kills mold, mildew and bacteria, band creates fungicidal barrier /b that prevents future mushroom and bacteria growth.
We earn a commission if you make a purchase, at no additional cost to you.
02/18/2024 11:24 am GMT

You might need to make several rounds of cleaning to ensure the full eradication of mushroom spores in the bathroom.

Meanwhile, if you don’t want to use bleach, any household cleaner and disinfectant containing benzalkonium chloride will also be effective in removing mushroom spores.

How to Keep Mushrooms From Growing in the Bathroom

So you cleaned the bathroom floor, walls, and the shower drain from growing mushrooms.

But that’s only a temporary solution.

Unless you take necessary action, mushrooms will keep growing in the bathroom.

These tips will help prevent another mushroom from growing in the bathroom.

Ensure Proper Ventilation in the Bathroom

Excess moisture that allows mushrooms to grow in the bathroom is often a result of poor ventilation.

Making sure that the air inside the bathroom is moderately dry makes the space less welcoming for mushroom growth.

So, ensure that the bathroom has proper ventilation.

Open the bathroom window or turn on the exhaust fan, especially after a hot shower or bath.

If your bathroom doesn’t have an exhaust fan, consider installing it for efficient moisture and odor removal.

Fix Bathroom Leaks

Another way to keep the bathroom dry is to make sure that you repair any leaks.

Inspect your bathroom plumbing and ensure there are no broken pipes, leaky faucets, or dripping showerheads.

If you deny mushrooms or mold the moisture it needs to grow in the bathroom, they are less likely to start sprouting again.

Keep Bathroom Towels and Rugs Dry

Fibrous in nature, fabrics like your bathroom towels and rugs are a welcoming place for molds to root, particularly if they are frequently damp.

Once fungi grow in there, it will be hard to get rid of them, so you’ll have to throw these towels and rugs away.

Always keep your towels or any fabric in the bathroom dry.

If you are using shower curtains made of wool or cotton, consider using nylon shower curtains or a shower curtain liner with mold-resistant film or coating, such as LiBa PEVA 8G Bathroom Shower Curtain Liner.

Mildew-resistant shower curtain liner
LiBa PEVA Mildew-Resistant Shower Curtain Liner. Non Toxic, Rust Proof Grommets, 8G Heavy Duty and Waterproof.

Made with 100% high quality and eco-friendly PEVA material. Free of PVC & chlorine, which means no unpleasant plastic smell or unpleasant chemical fumes. Ultra-smooth design rolls off water beads, keeping your bathroom dry and clean.

We earn a commission if you make a purchase, at no additional cost to you.
02/18/2024 05:18 pm GMT

Consider Using a Dehumidifier

If excess moisture is a massive issue in your bathroom, even with the bathroom window opened, consider running a dehumidifier to lower the humidity and prevent mushroom growth.

A popular option is the NineSky Bathroom Dehumidifier, which effectively removes moisture and maintains an ideal humidity level.

Bathroom dehumidifier for high humidity and mold
NineSky Dehumidifier for Bathroom, 30 OZ Water Tank (300 sq.ft) with Auto Shut Off and Overflow Prevention.

This compact dehumidifier is perfect for controlling humidity in small spaces like bathrooms. It helps to prevent problems like excess moisture, mold growth, and damp clothes. The auto shut-off and overflow prevention features make it worry-free to use.

We earn a commission if you make a purchase, at no additional cost to you.
02/18/2024 05:08 pm GMT

Clean the Bathroom Regularly

Deep cleaning should be a routine in your bathroom, once or twice a month, whether you notice mushrooms growing or not.

Besides mopping with soapy water, consider disinfecting the bathroom floor and walls with a mixture of bleach and water.

Mandy Phillips

As a frequent contributor to top US magazines and publications in the home improvement niche, Mandy has been known for sharing her expertise on how to clean, organize, and decorate bathrooms.

Additionally, Mandy has immense experience offering lifestyle tips and tricks to her readers.

About Loo Academy

At Loo Academy, our mission is to offer trusted advice for everything related to bathrooms (design ideas, plumbing advice, showering & bathing tips, remodeling guides, and more) — a place where we all spend a great deal of time.

We work closely with qualified experts and follow a thorough editing and fact-checking process before publishing content.

Published content is regularly fact-checked and revised so that the information we provide is accurate and up-to-date.

Legal Info

Loo Academy is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate Loo Academy is compensated for referring traffic to Amazon.com.

The information contained in this website is provided for informational purposes only.

The inclusion of links from this site does not imply endorsement or support of any of the linked information, services, products, or providers.