The isolation of an aerobic Mycobacterium sp. strain from anaerobic groundwater highlights the fact that groundwater contamination plumes are dynamic, and the biogeochemical cycles within them are not fully understood. Studies that track VC in shallow aquifers show VC mineralization under hypoxic conditions (Bradley 2011 ), though this is the first study to identify an organism that may be responsible for these in situ observations. Further studies must be performed to determine whether these strains of Mycobacterium spp. play an important role in in situ VC mineralization.