Related by context. Frequent words. (Click for all words.) 42 fluoride 38 tritium 37 arsenic 35 drinking 35 toxic chemicals 35 radioactive iodine 34 contaminant 34 bottled water 33 chlorine 33 fluoridation 33 contaminants 33 cadmium 33 pesticide 33 Drinking 33 benzene 33 E. coli bacteria 33 perchlorate 33 trace amounts 32 MTBE 31 infant formula 31 Water Quality 31 acetaminophen 31 phthalates 31 iodine 30 PFOA 30 contamination 30 nitrate 30 dioxins 30 mercury emissions 30 phosphorus 30 groundwater 30 sewage treatment 30 pollution 30 septic systems 30 pollutants 29 dioxin 29 BPA 29 wastewater 29 caffeine 29 pesticides 29 pollutant 29 toxicity 29 nitrates 29 sodium 29 harmful chemicals 28 wastewater treatment 28 raw milk 28 chromium 28 hydraulic fracturing 28 Arsenic 28 sewage 28 bisphenol 28 sulfur dioxide 28 fracking 28 carcinogen 28 mercury 28 radon 27 ppb 27 PCBs 27 disinfection 27 cyanide 27 phosphorous 27 carcinogens 27 toxins 27 curbside recycling 26 reverse osmosis 26 fructose 26 selenium 26 active ingredient 26 breast feeding 26 birth defects 26 effluent 26 water 26 nutrient 26 emergency contraception 25 gum disease 25 dosages 25 alkaline 25 filtration 25 tooth decay 25 vitamin D 24 Vitamin D 24 carbon dioxide 24 milligram 24 discolored 24 aspartame 24 smoking bans 24 contraceptives 24 flu vaccines 24 preservative 24 potable water 23 chloride 23 pediatricians 23 flu vaccine 23 milligrams 23 toxin 23 Atkins diet 23 micrograms 23 vitamin C 23 probiotic 23 sanitary sewer