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I like to "close the loop" on things, so just wanted to tell you that I got in touch with Sandy Davis from CAWST (thanks to the hint by Kris) and she was able to send me the images that I was looking for. The best thing: they are open access (CC-BY SA). But they are not easy to find on their website, as they don't have an image library yet (my suggestion is to use flickr as an image library).

Anyway, you can see three of these images of CAWST now here on flickr:

https://www.flickr.com/photos/gtzecosan/collections/72157652445783148/

And you can see them being used in several Wikipedia pages:

https://en.wikipedia.org/wiki/Water_pollution#Pathogens https://en.wikipedia.org/wiki/Water_well#Contamination https://en.wikipedia.org/wiki/Waterborne_diseases https://en.wikipedia.org/wiki/Groundwater_pollution#Pathogens