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What To Do If You Have Mold In Your Home

Signs, Symptoms, and Solutions of Mold Contamination

Mold has been living on our planet for millions of years, and there is always some mold everywhere. The infamous “toxic mold”–which refers to the varieties that release mycotoxins into the air–are the largest cause for concern. However, there are many more types of insidious mold that can cause a range of damaging health effects–via allergens and irritants.

What is Mold?

Mold is a form of fungus that spreads through the production of spores.These spores are invisible to the naked eye and able to survive in harsh conditions.

Mold can enter your home through pretty much any entry-way you can imagine–from sneaker soles and doorway cracks to heating units and AC systems. If there's moisture, dampness, and protection from direct sunlight–the spores can, and will grow into mold. Rapid growth occurs in areas with lots of moisture–particularly near leaks in pipes, windows, or rooftops–but frankly no area is outside the realm of mold-growth possibility (e.g. they even grow in drywall).

Because it’s nearly impossible to prevent spores from coming inside, it is critical to prevent spores from growing into mold.

What are Signs of Mold Contamination?

Although mold often grows in areas that can’t be readily seen–such as inside walls–mold growth is usually noticeable.

Sight: Mold can come in a wide variety of colors depending on the species. It can even contain a variety of colors in a single patch. Common colors for mold include: green, black, white, red, and orange. As it grows, the color may evolve over time.   

Smell:  Once spores grow into mold, some release microbial volatile organic compounds (MVOC). The MVOCs diffuse into the air and fill nearby areas with a particular smell (which varies according to the type of compound released. Depending on the type of mold species, you may smell a musty, rotten, or “wet sock” smell. These smells may feel dusty or ticklish to your nose. Note: just as different species of mold can produce different smells, they can also produce no smell (if they do not produce MVOCs or if the humidity, temperature, or light prevents them from doing so).

Feel: Just as color and smell vary depending on the species of mold, so too does the texture. From smooth to rough to fuzzy, mold can feel like velvet, cotton, or suede (to name a few!).

Taste: Just kidding; do not eat the mold!

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What are the Health Impacts of Mold Contamination?

Not all mold is the same. On top of that, everyone responds differently to mold. Some people may experience no symptoms, while others can experience life-threatening allergic reactions. Those who already suffer from asthma, allergies, or immune problems are more likely to experience symptoms when exposed to mold. 

According to the World Health Organization (WHO), inhaling or touching mold (or its spores) can lead to allergic reactions (immediate or delayed). Symptoms include:

  • Nasal congestion
  • Throat irritation
  • Coughing
  • Eye irritation
  • Skin irritation
  • Immunological reactions
  • Additionally, some mold can emit volatile chemicals that may impact your nervous system.

    What Can I do About Mold in My Home?

    In order to treat mold in your home, the first step is to test for it. If you find (or at least suspect) that you have mold growing in your home, the key is to take action quickly.

    First: Identify where the mold is

    Ways to test for mold vary depending on its location. A few ways to check for mold include:

  • Pinpointing the sources of the odor: Start by pulling the air out of the (sealed) room by placing a fan in a window. Then crawl around and sniff for musty or earthy smells near cracks. (We know this one isn’t very glamorous–but neither is having a mold-filled home!)
  • Check around areas and sources of moisture: Areas that appear to have water damage can potentially harbor mold. A good way to check is to use a moisture meter to detect elevated humidity
  • After you’ve identified the location of the mold, there are two more steps you need to take: clean the mold and eliminate the moisture problem. It is commonly recommended that you wash down surfaces with a bleach solution (1 cup bleach to 1 gallon of water) to kill the mold.

    Then, control the mold source

    Mold removal is not always a permanent solution, as it can, and tends to, grow back–especially on porous surfaces like wood or fabric. This is why it is crucial to eliminate the source of the mold–i.e. the moisture. The best ways to do this include:

  • Controlling humidity (keep levels no higher than 50%)
  • Fixing leaks in roofs, windows, and pipes
  • Ventilating shower, laundry, and cooking areas
  • If you have a mold patch in your home 3ft by 3ft, we recommend contacting a professional mold-cleaning expert.

    It's hard to get trustworthy advice when it comes to your drinking water, so we made Tips for Taps to help answer your questions. Order a Tap Score Water Test and receive personalized support from professional engineers and scientists by phone, email and chat.


    Oct 18, 2018 • Posted by John H Pujol

    Hello Ebenezer !

    Great question. I’m really sorry to hear about the trouble you’re having. Getting rid of biological contamination (bacteria, mold, algae…) can be super frustrating.

    In general, when you find one mold problem, there are others lurking nearby (and this is true of bacteria often as well). Living things can quickly move down and upstream.

    My feeling is that you have contamination on either side of your filter and probably in your filter as well. Your best bet is to do a chlorine shock.

    Here is a comprehensive set of instruction that you can follow:

    If you have questions about this, reach out to us by email ( or by clicking the blue comment bubble on the bottom right hand side of our blog screen.

    Oct 17, 2018 • Posted by Ebenezer

    I dogged a water borehole and I have wasted it for more than 2weeks now, and I am still have a moldy test from the water, despite passing through sand and carbon fiber treatment plants it is there, I don’t know what else to do, pls else can I do to get that moldy test out from my water

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