Get mold removed and the moisture fixed

The EPA says that if the moldy area is less than about 10 square feet, most people can handle the job themselves. For larger areas, the EPA advises following its remediation guidance and, if you hire help, choosing a contractor with mold cleanup experience. If the mold came from sewage or other contaminated water, the EPA says to call in a professional, and if you have health concerns, talk to a health professional before you start.

Usually not. The EPA says that in most cases, if mold growth is visible, sampling is unnecessary. Sampling can help confirm that an area was cleaned well, and the EPA says it should be done by professionals.

The EPA's remediation guide says biocides such as chlorine bleach are not recommended as a routine practice, because the goal is to remove mold, not just kill it. Porous materials with mold, like ceiling tiles and carpet, may have to be thrown away. If you do use bleach on a hard surface, the CDC says to use no more than 1 cup per gallon of water and never mix it with ammonia or other cleaners.

For some people, mold can cause a stuffy nose, sore throat, coughing or wheezing, burning eyes or a skin rash, according to the CDC. People with asthma or mold allergies may have severe reactions, and people with weakened immune systems or chronic lung disease can get lung infections from mold. If you have symptoms, talk to your doctor.

The EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth. Massachusetts public health guidance adds that porous materials not dried in that window may grow mold.

Fix leaks and water problems, and keep indoor humidity in check. The CDC advises keeping humidity no higher than 50 percent all day, and Triple-I suggests air conditioners or dehumidifiers to help. The EPA notes that a remediation plan has to fix the moisture problem, or the mold may come back.