ROB, nobody checks for microscopic bacteria. The copepods in NYC water are nireh l’einaim. I’ve seen them. Water having toloim issues is not new. There are teshuvos written about it from hundreds of years ago, as well as teshuvos about vegetable infestation.
The bugs in strawberries, which are also visible, stick to the berry unless soap is applied. Where you see outlandish chumros, I see lack of awareness in your part.