Here is the list of the Top 10 Signs you may have mold.

1. High Humidity

If you live in an area with high humidity, then you should always be on the lookout for potential mold problems. High outdoor humidity increases indoor humidity levels and creates an ideal environment for toxic mold growth.



2. Water/Pipe Leaks

Mold needs moisture in order to grow and thrive. Many mold problems originate as a result of some kind of water intrusion, especially those that are not resolved quickly. Water and pipe leaks are common culprits, since they provide plenty of moisture, and are often undetected for days, months, or even years if very minor.

3. Flooding

Mold problems are very common after flooding due to the excessive moisture which is perfect for mold growth. It usually requires several days to fully dry out a home or building once flooding occurs, giving colonies of black mold more than adequate time to become fully ingrained in these sections.

4. Musty Odors

Odors can often be the first or only sign of a potential mold problem since mold can grow and spread in places not normally in view. This does not necessarily mean you definitely have a mold problem, but it should prompt you to look for other signs of mold or look for the mold growth itself.

In some cases, mildew smells will only be evident when the air conditioning or heat is turned on, or it may just be much more evident when the HVAC system is running. If this is the case, then it is very possible you have significant mold growth within the HVAC system.

5. Increased Allergy/Respiratory Symptoms

Another sign of mold can be increased allergic reactions or an onset of respiratory symptoms. If one or more individuals begin suffering from allergic reactions that seem associated with the home or building, then it may be due to the presence of high levels of mold. This may be experienced after moving into a new home or starting work in a new building.

Remember, that according to a 1999 Mayo Clinic study, nearly all chronic sinus infections (afflicting about 37 million Americans) are a result of mold.

6. Condensation or Rusting

Condensation on or around pipes, windows, or walls is a sign of a leak or high humidity. Rusting on pipes or other metals is due to the close proximity of water or moisture. Runoff condensation from an AC unit can also create a moist environment that promotes mold

7. Discoloration of Walls (Water Stains)

Yellowish stains on walls and ceilings are a sign of excessive moisture. In cases where mold growth may already be in full swing, the wall or ceiling may have a greenish, brownish, or blackish discoloration. You may also notice places where the paint is coming off due to moisture

8. Black Growth in Bathroom Tiles

Bathrooms are a favorite breeding ground for mold. Increased moisture and the common presence of tile in bathrooms are highly supportive for the growth of mold colonies.

Tile grout is porous and will allow water penetration behind the actual tiles. In addition, dirt and other grime (favorite foods of mold) are easily trapped in the grout. This combination creates an ideal environment for mold to thrive.

9. Poor Ventilation

If the air pressure in your home is "negative", meaning the air pressure outside is greater than it is on the inside, then it will force moisture and contaminates into the home. If the air pressure in your home is much greater than the air pressure outside, then it can cause moisture to be forced into the walls. The air pressure in your home should be slightly “positive” or at least balanced.

10. Mold Test

There are a variety of sampling techniques that can be used to help determine whether or not you have excessive levels of mold. There are mold tests that take samples from the air and some that take samples from surfaces. Each method has its advantages and disadvantages.

Some techniques identify what species of molds are present. This can be helpful since some mold species pose a greater health risk than others.