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  • Mold

    Clean up and prevent mold in your home.

    Learn about mold, health effects from mold, how to get mold problems fixed and where to find legal or housing assistance.

    Mold information

    Tenant and landlord information

    Legal and housing information

    More information

    We do not provide mold inspections, testing, cleaning or repairs. Search online for these services.

    Call the Mold phone line for recorded information at (253) 649-1420, option 6.

    Mold FAQs

    Molds are a type of fungus. Other types of fungus include mildews and mushrooms. Molds occur widely in nature and outdoors. There is no practical way to get rid of all mold spores indoors.

    Molds grow in our homes because of too much water. Leaky plumbing or a hole in the roof can let water into your home to help mold grow. Humid air from cooking, breathing or showering can also lead to mold growth unless you let the damp air out and fresh air into your home. Common materials we have in our homes like paper, drywall, leather, and carpeting provide food for mold growth if they get wet. Controlling moisture is the most important thing to remember when dealing with mold.

    You might find mold in water damaged areas, on the inside of cold exterior walls, behind dressers, headboards and in closets where things are stored against a cold outer wall. Other areas where mold often grows are kitchens, bathrooms, laundry or utility rooms, and basements. Carpets and other water-damaged materials will easily support mold growth. Mold may also grow undetected inside wall spaces, under carpet, and inside heating ducts.

    If you see or smell mold, or a musty odor, you have a mold problem. You should clean up the mold as soon as possible. Testing for molds is not usually needed unless you need documentation for medical or legal reasons. Even dry or dead mold spores may cause health problems.

    Stop all water leaks first. Repair leaky roofs and plumbing right away. Move water away from basement walls and concrete slabs.

    Increase air movement within your home. If needed, use ceiling or standing fans to circulate air throughout your home. Pay special attention to outside walls.

    Provide warm air to all rooms of your home. Leave closet doors slightly open. Move furniture and large objects away from outside walls. Leave a few inches for air to move between the wall and belongings. ‘Flush’ the air in your home at least once or twice a day. Do this by opening all windows and turning on all exhaust fans for five minutes. Close windows and reheat home to 70 degrees.

    Make sure you have working exhaust fans in bathrooms, kitchens and laundry rooms. Run fans while bathing, cooking or doing laundry and for at least 30 minutes afterwards.

    If your living area is constantly humid even with proper ventilation and temperature control, you may want to consider the use of a dehumidifier. Dehumidifiers can be helpful to control moisture in basements or daylight basements.

    Ventilate and insulate attic and crawl spaces. Cover dirt in the crawl space with heavy plastic.

    Clean and dry water damaged carpets, clothing, bedding and fabric furniture within 24 to 48 hours. Otherwise consider throwing it away and replacing with new. Vacuum (with a HEPA vacuum if possible) and clean your home regularly.

    If you see or smell mold, it’s time to clean up.

    Try to determine how much of an area has a mold problem. For a larger area (greater than 10 feet square) you need to pay attention to personal protection. Use goggles, gloves and breathing protection, such as an N95 dust mask.

    Isolate the work area as much as possible. Cover heat vents. Close the door or hang plastic across open doorways and seal with tape. Open a window or use an exhaust fan.

    Cover all furniture in the area. Sheets or paint drop clothes can be used. For a large area of mold, move all belongings to another place before clean up. Sort articles for later clean up. See below for cleaning household articles.

    Remove severely mold-damaged materials by putting them in bags and throwing away.

    Scrub the area with a mix of dishwashing liquid and water or liquid laundry detergent (no bleach) and water. Use just enough detergent to make the water a little sudsy. It is important to physically remove all molds!

    Thoroughly dry the area. It is not necessary to use bleach. Bleach can be harmful to your health. Be sure that you scrub away mold with detergent first. If you do use bleach, a mix of 1 part bleach to 9 parts water is enough, or about 1 cup bleach to a gallon of water. Wipe this lightly over the previously moldy area, let sit for 20 minutes, then wipe dry.

    Give the entire area a good cleaning. Vacuum floors and wash bedding and clothes if needed. Consider hiring a professional if the area is larger than 10 square feet, or roughly the size of a full sheet of newspaper.

    Belongings should be sorted into three categories:

    • Permeable and washable: Clothing, bedding and other washable items should be run through the laundry.
    • Non-permeable and washable: wood, metal, plastic, glass and ceramics. First try scrubbing clean with a liquid soap. If that does not work, use one cap of bleach to one quart of water. Spot test to check for spotting from the bleach. Wipe down items, let sit for 20 minutes and then dry.
    • Permeable but not washable: Beds and furniture fit into this category. If items such as mattresses or couches are moldy, you should consider disposal and replacement. If not take them outside; give them a good vacuuming and let them air out. If you do not see or smell mold on the items after this, they should be okay.

    Watch for any new mold growth or health effects. Carpeting and upholstered furniture, if not too badly damaged by mold, can sometimes be cleaned by a professional using hot-water extraction or steam-cleaning. Rental rug-shampooing units are usually ineffective for proper removal of mold and in some cases may cause more mold to grow.

    We are exposed to mold by breathing mold spores from the air. When an area of mold is disturbed, levels of spores in the air may increase up to 10,000 times. It is important to wear protective equipment for cleanup. Eating mold-contaminated material may also expose us.

    There may be toxic effects or allergy. Molds sometimes produce toxins.

    Health effects from toxic exposure may include:

    • Tiredness.
    • Nausea.
    • Headache.
    • Respiratory or eye irritation.

    Allergic reaction to mold may include:

    • Eye, nose, and sinus irritation.
    • A skin rash.
    • Problems with asthma.

    Allergies may be to a specific mold species and you may not react to all mold species. Persons most at risk include young children, elderly, those with compromised immune systems and people with respiratory conditions such as asthma or Chronic Obstructive Pulmonary Disease.