I was given this advice for well testing:

"The first time you do a Coliform test yourself and find Coliform remove the petri dish lid or the Presence/Absence test container cap and take a whiff. Then the next time you are collecting well water samples, smell the water for the same odor and see if over a few years you can learn how to use an educated guess as to the different odors caused by the different types of bacteria found in well water. Not all Coliform contaminated waters will have an odor. More hands on field experience might help. "

Just wondered in getting some opinions here....