In addition to the association of groundwater availability with this locale along the Balcones Fault, the area is also considered an ecological dividing line for occurrence of some species; for example, the California Fan Palm, Washingtonia filifera occurs only at or west of Comal Springs, i.e. Balcones Fault zone.
Beyond its association with groundwater availability along the Balcones Fault, this region serves as a significant ecological divide for certain species. For instance, the California Fan Palm is restricted to areas either at or west of Comal Springs, which falls within the Balcones Fault zone.