Determining whether a unit should have a mold test conducted typically depends on several factors, including visible signs of mold, the presence of moisture issues, and the potential health risks. Here are some criteria to consider when deciding whether to conduct a mold test:

  1. Visible Signs of Mold:  If there are visible signs of mold growth, such as discolored patches, fuzzy or slimy texture, or a musty odor, it’s a clear indication that a mold test may be needed. These signs suggest that there might be an underlying mold problem.
  2. Water Damage or Moisture Issues: If there has been recent water damage, flooding, leaks, or high humidity levels in the unit, it increases the likelihood of mold growth. Mold often thrives in damp conditions, so any history of water-related problems should trigger a mold inspection.
  3. Health Symptoms:  If residents or occupants of the unit are experiencing unexplained health issues, such as respiratory problems, allergies, or other symptoms that could be related to mold exposure, it may be advisable to conduct a mold test to identify potential sources of contamination.
  4. Pre-purchase or Pre-rental Inspection: Prior to purchasing or renting a property, it is common to have a mold inspection as part of a broader home inspection. This can help identify any pre-existing mold issues that may need to be addressed.
  5. Musty Odor: A persistent musty or earthy odor in the unit can be an indicator of hidden mold growth. If such odors are present, it may be a reason to consider mold testing.
  6. History of Mold Problems: If the unit has a history of mold problems or if neighboring units have experienced mold issues, it may be prudent to conduct periodic mold tests to monitor and address potential recurring problems.
  7. Concerns about Indoor Air Quality: Mold can negatively affect indoor air quality. If there are concerns about air quality, especially in environments where occupants spend a significant amount of time, it may be advisable to test for mold to ensure a healthy living or working environment.
  8. Preventive Measures:  In some cases, mold tests are conducted as part of routine maintenance or to proactively identify and address mold issues before they become severe.


It’s important to note that mold testing is not always necessary in every situation. In some cases, you may be able to visually identify and address the issue without testing.