Are you looking at the results in the table on the main page? That is tap water treated with some purifying tablet, not straight tap water. There is plain tap water in the full database but it doesn't seem to have levels of anything in excess of established limits.
My mistake, I didn't see that part. I thought the tablet treatment was just something they did to prepare it for testing. Maybe the tablets kill the microfauna via microplastic overdose.
