Do You know how much chlorine and flourine is added into our public water supplies to kill bacteria ?
Chlorine levels up to 4 milligrams per liter (mg/L or 4 parts per million (ppm) are considered safe in drinking water. At this level, no harmful health effects are likely to occur.
To prevent contamination with germs, water companies add a disinfectant—usually either chlorine or chloramine 1—that kills disease-causing germs such as Salmonella, Campylobacter, and norovirus. The type of chloramine discussed on this page that is used to treat drinking water (monochloramine) is not the same type that can form and harm the indoor air quality around swimming pools (dichloramine or trichloramine) .
Straight from the CDC
https://www.cdc.gov/healthywater/drinking/public/water_disinfection.html