AWWA/APHA Standard Methods for Examination of Water and Wastewater includes a chapter 9218 "Aerobic Endospores."
Realizing this is not routinely performed in water testing, can anyone provide perspective/ experience regarding any application of this method?
Note - It has been proposed for use in identifying soil intrusion into a distribution system: http://www.industrycodes.com/products/271ad0/awwa-jaw70392-journal-awwa-evaluating-aerobic