The moment of discovering that there is mold in your apartment can be incredibly stressful, and the first step should always be to find a high-quality, well-researched information source to help you figure out what to do next.
You’ve done that step, so congratulations! You’re well on your way to solving this problem. But right now, you need quick answers – we get it. So here is the quick and dirty definitive list of what to do when your apartment has mold.
Table of contents
How to Know if It’s Mold
Fortunately for you, just because you see black stuff in your bathroom doesn’t mean it’s mold! Taking the time to learn whether or not it is can save you a lot of headache. So, what else could it be? The most likely answer is mildew.

Is It Mold or Mildew?
Determining if your apartment has mold or mildew is a very important step, and it could save you a lot of time! This is because the removal and cleaning process for mildew and mold are completely different – and one of them is much easier.
Signs It’s Mold
Mold is a kind of fungi that will grow just about anywhere there is warmth, darkness, and moisture. It appears furry or slimy, it is usually black and green (but can be red, according to Today’s Homeowner). It usually spreads quickly behind large appliances and furniture. Mold roots itself deep into the material it’s on, making it very difficult to just wipe off. Because it spreads quickly and roots deeply, a professional mold removal company is often required. You may have to look into hiring one, like the well-trusted Cleaner Guys.
Signs It’s Mildew
Mildew is actually a form of mold. However, it’s far less invasive than the forms described above. Mildew is usually grey or brown, often has a very small spot pattern, and is primarily found in showers, bathrooms, and on hard surfaces that see a lot of moisture. Luckily, mildew is very easy to clean off! It does not root into the surface it’s on – unlike other molds – and so usually all it takes is a strong cleaning chemical and a little scrubbing to remove it entirely. No need to call anyone.
Your Rights as the Apartment Renter
Once you’ve found mold, one of your first concerns is naturally going to be who is responsible for mold in an apartment. The answer is, of course, it depends. Here’s what you need to know.

1) Landlord-Tenant State Laws
Is it illegal to have mold in your apartment? Absolutely not. In Washington State, however – the area where Cleaner Guys provides our services – the Residential Landlord-Tenant Act does not require landlords to remove all mold. It states only that the landlord must maintain the state of all structural components “in reasonably good repair so as to be useable.” (RCW 59.18.060)
Landlord-tenant laws in other states vary widely, and while Cleaner Guys is not certified to give any legal advice, we strongly advise you to look up the laws in your state in this matter.
2) Your Landlord’s Responsibilities
Your landlord is always where to report apartment mold first. However, if you’re in Washington State, as mentioned above, there are no laws requiring your landlord to fix the mold for you. Therefore, the best course of action is probably to get a professional mold inspection, to figure out the source of the mold. This will determine whether the mold is your fault, or your landlord’s, and can help facilitate a discussion about who should pay for the mold removal.
Will Apartment Mold Make You Sick?
Yes, mold can make you sick. Is mold in apartments dangerous? Not usually. But knowing the symptoms of mold sickness can be the first step to knowing if you have mold in your apartment. Any mold illness symptoms you may be showing can be a clue as to how severe your mold problem is.

Mold Sickness Symptoms
Not everyone is sensitive to mold. However, you may know that you are if you experience symptoms such as persistent congestion, constant sneezing, itchy eyes or skin, or unusual amounts of coughing. The CDC even links mold to upper respiratory infections.
What to Do If You Have Mold Sickness Symptoms
If you have any number of these symptoms, search your apartment thoroughly for mold. Look behind all large appliances and furniture, in the back of all cupboards, around windowsills and other areas that can collect moisture. Check out our related article listing some of the top sneakiest hidden places to find mold.
How to Clean Apartment Mold
Different levels and types of cleaning are necessary depending on how large the affected area is. Figuring out what kind of mold cleaning techniques you’ll need for YOUR mold is essential.

If the Affected Area is Small
If the mold in your apartment is about 1 square foot or smaller, you can safely try cleaning it yourself before calling a mold removal company like Cleaner Guys. According to Homes & Gardens, a popular home remedy you can try is spraying vinegar on the affected area and letting it sit for at least an hour, making sure the room is ventilated, and then scrubbing the mold off thoroughly. Another method is purchasing a detergent specifically designed to kill mold. Cleaner Guys recommends Fiberlock Shockwave, an unsponsored product we use in our own work.
If the Affected Area is Large
If the mold you discover covers an area greater than 1 square foot, you should not attempt to clean it yourself. It is almost certainly too deeply rooted to be easily cleaned off. The first thing you should do is call your landlord and let them know about it immediately. Negotiate with them whether they will pay for a mold removal service or if you will, usually depending on whether the cause of the mold was the landlord’s fault or yours. (See the above section on “Landlord Responsibilities” for more.) The best way to determine this is by getting a mold inspection, to lock onto the true cause of the mold. Learn about what to expect from the mold removal process here.
How to Prevent Mold Growth in the Future
Taking steps to ensure you make your apartment an inhospitable place for mold is essential moving forward. You certainly don’t want to have to deal with this kind of stress again! Luckily, there are some simple things you can keep track of that will greatly reduce your chances of getting mold again in the future.

What Causes Mold in Apartments?
What causes mold in apartments is 4 things: darkness, moisture, warmth, and oxygen. If there are areas like these in any indoor space, mold can sprout up overnight. However, there are some simple things you can do to make mold spores skip rooting in your home.
How to Prevent Mold in Your Apartment
- Keep Indoor Humidity Low. We agree with the CDC’s recommendation to keep your indoor humidity ideally lower than 50%. This means less moisture for mold to grow in.
- Take Care of Leaks Immediately. If you live in a rental home, alert your landlord about leaks and damaged window sealings immediately, pressing them about it as necessary and pointing out that it will cause mold they may have to fix.
- Ventilation, ventilation, ventilation! Try to have some kind of airflow in every room. Ceiling fans, freestanding fans, and even opening a window will do. Stagnant air encourages mold growth.
- Regular Cleaning. Mold feeds on organic materials like dust and crumbs — so don’t give it any!
Key Takeaways
Mold can unfortunately grow just about anywhere given the right conditions, and it spreads incredibly quickly. But with this ultimate guide, you can be empowered to not only know what to do if you find mold in your apartment but also to know how to prevent it from happening!
If you find yourself in the unfortunate position of needing a professional mold inspection or removal company near Mount Vernon WA, consider Cleaner Guys as a high-quality, well-trusted option. We’re proud to both keep our prices lower than other such companies, and still deliver top-notch workmanship.
Disclaimer: This article is for informational purposes only. No part of this article is medical or legal advice, and may not be used as such. For all serious medical matters, consult your doctor. For all serious legal matters, consult your legal advisor. This article contains Cleaner Guys’ experience and opinions only.