Related by context. Frequent words. (Click for all words.) 77 fluoridation 59 arsenic 57 chromium 54 perchlorate 54 mercury 53 tooth decay 52 chlorine 52 nitrate 51 iodine 49 selenium 49 manganese 49 nitrates 49 vitamin D 48 benzene 48 BPA 47 groundwater 47 folic acid 46 sodium 46 bottled water 46 dioxin 46 contaminant 46 trace amounts 46 phosphorus 46 Vitamin D 46 toxic chemicals 46 vitamin C 45 radioactive iodine 45 water 45 caffeine 44 contaminants 44 pesticide 44 radon 44 phthalates 43 carcinogen 43 drinking 43 acetaminophen 43 fructose 43 toxins 43 zinc 43 wastewater 43 wastewater treatment 42 pesticides 42 calcium 42 probiotics 42 phosphorous 41 Vitamin C 41 potable water 41 carcinogens 41 magnesium 41 sewage treatment 41 preservative 41 toxin 40 cadmium 40 nutrient 40 toxicity 40 infant formula 40 effluent 40 carcinogenic 40 gum disease 40 sewage 40 filtration 40 sunscreens 39 aquifer 39 sulfur dioxide 39 contamination 39 MTBE 39 raw milk 39 vitamin 39 depleted uranium 39 micrograms 39 sunscreen 39 preservatives 39 ppb 39 cyanide 39 alkaline 39 milligrams 39 salt 38 birth defects 38 dosage 38 dosages 38 pollutant 38 Drinking 38 salts 38 radiation 38 trans fats 38 discolored 38 mercury emissions 38 E. coli bacteria 38 fracking 38 PCBs 38 vitamin E 38 water mains 38 antioxidants 38 breastfeeding 38 TCE 38 flu vaccine 38 carbon dioxide 38 nutrients 37 pollutants 37 pollution 37 active ingredient