Mold in Your Apartment? Here’s What to Do

 In Featured Post, renting, Renting a Home, safety

Mold is always around you. There are probably spores in the air you’re breathing right now. For most people, a few mold spores won’t pose a health risk. But, given a chance to grow, mold can quickly threaten the health of a home and the people living there.

Studies have linked mold exposure to various health issues, which often involve respiratory symptoms like coughing, wheezing, and trouble breathing. According to the CDC, mold can aggravate asthma, trigger allergies, and cause hypersensitivity pneumonitis, a type of lung inflammation.

Human health aside, mold can also affect the well-being of pets and the home itself. Mold can grow on ceiling tiles, drywall, wood, and other materials, causing extensive damage over time.

It’s always best to address mold as soon as it’s discovered, no matter the type of mold or size of the problem. This is what you need to know about addressing mold issues in your apartment or rental home.

black mold on wall

What should you do if you think there’s mold in your apartment?

Mold growth is usually easy to recognize, when you can see it. It can be white, black, green, gray, or yellow in appearance and give off a musty odor. It will form near water damage or places where moisture collects.

You can’t always see mold growing. Sometimes, the smell is the only sign.

A mold infestation will spread as far as conditions allow, so it’s best to tell your apartment building management or landlord as soon as you suspect a problem. That gives your landlord a chance to fix the problem before it gets worse.

Take note of a few things:

  • The surface the suspected mold is growing on. Note whether it’s a hard surface (tile or glass) or a soft surface (carpet or upholstery).
  • The spread of the suspected mold. How much space is it affecting?
  • The color and odor of the suspected mold.

Take photos of the suspected mold for your records. If you can, try to determine the cause of the mold growth, such as a leaky pipe or lack of ventilation, but only if it’s easy to see. Don’t do anything that risks your health or damages the property.

Once you’ve gathered your findings, report them to your property manager or landlord.

Don’t wait to address a possible mold problem. If mold is present, it’s best to treat it quickly. Mold on hard surfaces can usually be cleaned, but soft surfaces usually need to be disposed of. More on that later.

What causes mold to grow indoors?

Microscopic mold spores are present in the air and aren’t visible to the naked eye. They can start growing within 12 to 48 hours after drifting onto a wet surface. This is why mold is most common in high-moisture areas like bathrooms and kitchens. It can also appear in places that always have a high humidity level.

Leaks and flooding also encourage mold growth. That makes roofs, attics, windows, pipes, and basements easy targets.

Mildew, a type of mold, likes to grow on hard surfaces. But it can also thrive on soft, damp surfaces, especially cellulose materials like paper, wallpaper, cardboard, and wood.

How do you know which types of mold are toxic?

Toxic molds release substances called mycotoxins, harmful byproducts of mold. Mycotoxins travel through the air on mold spores and can lead to illness in humans and pets.

All mold varieties can affect your health, but different types of mold affect people differently, having a stronger effect on some than others.

The people most at risk of developing mold-related irritation or illness are:

  • People with mold allergies
  • People with respiratory illness
  • People who have a compromised immune system

There are several types of toxic mold. The most widely known form is Stachybotrys chartarum, better known as black mold.

Black mold

Black mold is a common type of toxic mold found throughout the U.S. It likes to grow on paper and fabric materials and is typically dark in appearance. Sometimes, it looks fuzzy or speckled in orange. It has a distinct, musty odor. 

It can be hard to distinguish between black mold and other forms of mold. Black mold can cause serious health issues in some people, so it’s important to act quickly.


Mildew refers to a group of mold or fungus that likes to grow on hard surfaces, especially tiles, painted wood, and laminate in high-moisture conditions. You’ll often find mildew in the nooks and crannies around your shower.

Some types of mildew can produce mycotoxins, and all mildews can cause health issues if you’re exposed long enough. It’s generally easy to contain when it’s treated right away.

Other types of mold

There are many types of mold, and most mold colonies contain several different species. Some molds are more toxic than others, but all molds can potentially cause health problems for the people and animals in your home.

Things that can be mistaken for mold

Moss, algae, and lichen can grow on the siding, roof, or patio of your home and can often be mistaken for mold. They tend to grow in naturally humid climates. You might see moss growing on apartments in Seattle, WA, but it would be pretty unusual to see it on apartments in Phoenix, AZ.

These plants tend to be harmless, but they can be signs of a moisture problem that can lead to indoor mold or damage the home. They can also mean other, larger issues with the home.

Dark stains, pollen, and even dust buildup can also be mistaken for mold damage.

When in doubt, document the problem and tell your property manager or landlord, just in case.

houseplant in front of window with condensation

Should you test mold after you find it?

The decision to test mold is up to you and your property manager or landlord.

The CDC suggests tenants skip testing and go straight to removal, since any mold can present health risks. “No matter what type of mold is present, you should remove it,” the CDC says.

Since health effects vary so much from person to person, they add that “you cannot rely on sampling and culturing (testing) to know your health risk.”

How do you treat mold in an apartment?

Fixing a mold problem is possible, but the treatment plan depends on how bad the problem is. Small mold or mildew issues tend to be easier (and cheaper) to fix.

This is why it’s so important to address mold as soon as you see or smell it. The bigger a mold problem gets, the more complicated and costly it gets to repair.

Treating minor mold problems

Minor mold problems are typically defined as anything smaller than 10 square feet. Mold is usually easier to address when it shows up on tile, around windows, or on other hard surfaces that tend to catch water.

The EPA doesn’t recommend using bleach to treat a common mold problem yourself. Instead, they suggest using a simple mixture of water and detergent.

If you see mold on soft surfaces, the best solution is usually to dispose of it. These surfaces include:

  • Laundry
  • Upholstery
  • Drapes
  • Rugs
  • Carpets
  • Books
  • Paper 

If the item belongs to the property owner, make sure to contact them before you throw anything away. If you aren’t sure whether to clean something or throw it away, talk to your property manager. If you want to try to save personal items with mold on it, contact someone who specializes in mold remediation and removal.

Treating larger mold problems

When mold infestation affects an area larger than 10 square feet or isn’t easy to clean, it’s best to seek professional help.

Professional mold removal services typically cost between $500 and $3,000, depending on the extent of the damage. In some cases, they can cost more.

person wearing rubber gloves while cleaning mold

Know your renter’s rights

Tenant rights vary from state to state. But they usually include laws that protect tenants from living in an unhealthy environment.

Tenants may need to meet some or all of the following requirements before management is legally required to fix a mold problem:

  • The tenant sent timely notice in writing (specific requirements may vary by state)
  • The mold wasn’t caused by the tenant or tenant’s guests in the rental unit
  • The tenant isn’t behind on rent

Unlike health hazards like lead paint, the U.S. government has no federal laws regarding mold in apartments or other rental property. Each state makes its own guidelines, so check the landlord-tenant law where you live to plan your next steps.

What to do if your landlord won’t fix a mold problem

You may have options if the landlord won’t fix a mold problem that meets your state’s requirements. If you aren’t sure about your rights, speak with an attorney or advocacy group specializing in landlord-tenant law.

A tenant’s options may include:

  • Break the lease without penalty
  • Pay for mold removal themselves and deduct the cost from the rent
  • File a lawsuit against the landlord

These options are a tenant’s last resort. Talk to a certified attorney to fully understand your rights.

How to keep mold out of your apartment

A landlord is much more likely to hold a tenant responsible if the tenant’s actions contributed to the problem. The CDC recommends taking these steps to prevent mold from growing in the first place:

  • Keep humidity levels low. Air humidity levels below 50% are optimal. Home improvement stores sell humidity meters that measure the air’s moisture. Air conditioners and dehumidifiers may be able to help tenants who don’t already have them.
  • Allow indoor air to flow freely. Use exhaust fans in bathrooms and kitchens to push moisture out of the home. If you have a clothes dryer, make sure it’s venting air outside.
  • Keep your apartment clean. Clean bathrooms with cleaning products that kill mold. Make sure to follow all safety instructions listed on the package, especially if it contains toxic chemicals.
  • Tell your landlord right away if you notice any water leaks or moisture buildup.

How property managers can keep mold away

Preventing mold problems protects a tenant’s health and the owner’s investment. In addition to the tips above, the CDC suggests that property owners:

  1. Remove soft materials (like carpeting and upholstery) from basements, bathrooms, and other damp areas.
  2. Use pressure-treated wood when you can. Properly paint, stain, or seal wood and repair cracks or holes in wood with caulk.
  3. Routinely inspect the property to check for leaks and proper care. Inspection laws may vary by state and the terms of the lease agreement.
  4. Ask tenants to report leaks and standing water immediately. Fix any water issues as soon as they appear.  

If a mold issue arises, it’s important for tenants and property managers to take action. Acting quickly and effectively is the best way to protect against mold’s harmful and costly effects.

Redfin does not provide legal, tax, or financial advice. This article is for informational purposes only and is not a substitute for professional advice from a licensed attorney, tax professional, or financial advisor.

The post Mold in Your Apartment? Here’s What to Do appeared first on Redfin | Real Estate Tips for Home Buying, Selling & More.

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