Crossword Genius

Indicator of water pollution (1,4)

Ross

I believe the answer is:

e coli

(Other definitions for e coli that I've seen before include "An infection found in food and water" , "cause of illness" , "Bug that causes food poisoning" , "Nasty bug" , "Some types of this bacterium are toxic" .)

I've seen this clue in the Sydney Morning Herald.
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