I wrote an article on 05/12/2012 about our isolation of antibiotic-resistant genes in bacteria in water and in stream and river muds, comparing pristine waters with polluted ones along a stretch of a river in the Waikato region of New Zealand.
I recently read another article by Jack Heinemann and Sophie Joy van Hamelsveld from University of Canterbury in Stuff: https://www.stuff.co.nz/pou-tiaki/300930926/antibioticresistant-bacteria-in-wild-cockles-and-watercress-putting-people-at-risk-of-serious-illness. It's worth a read.