What is the difference between the group 1 and the group 2 molds?
Initial studies by the EPA analyzed 82 species of fungi, and 36 of these were commonly found across the U.S. This group of 36 species was then divided into 26 Group 1 molds and ten Group 2 molds. Group 1 molds are those molds that are most likely to indicate a water intrusion event. The Group 2 molds are outdoor molds that are not frequently associated with water damage.
