We don't, except in some narrow contexts, like "Large quantities of E.c. found in bottled water". Looking at pristine lake far in woods one wouldn't say "Look,

We don't, except in some narrow contexts, like "Large quantities of E.c. found in bottled water". Looking at pristine lake far in woods one wouldn't say "Look, such a contaminated water!" just because there are bacteria. We also don't say "My intestines is contaminated with E.Coli" in spite of the fact it's there too.