Related by context. Frequent words. (Click for all words.) 65 suspected carcinogen 61 trihalomethanes 59 chromium 59 bromate 58 methyl mercury 58 total dissolved solids 58 hexavalent chromium 58 maximum contaminant 58 trichlorethylene 57 tetrachlorethylene 57 polychlorinated biphenyls PCBs 57 arsenic 57 contaminants 57 #,# dioxane 57 harmful contaminants 56 hydrogen sulfide 56 contaminant 56 toxic chemicals 55 dissolved solids 55 ultrafine particles 55 carcinogenic chemicals 55 concentrations 55 radium 55 perchlorate 54 fecal bacteria 54 PFOS 54 ppb 54 chloramine 54 coliforms 54 fecal coliform bacteria 53 arsenic mercury 53 toxicants 53 nitrate 53 carcinogen 53 perchlorethylene 53 hydrofluoric acid 53 benzene 53 vinyl chloride 53 air toxics 53 chlorine 53 radioactive cesium 53 PBDE 53 potentially carcinogenic 52 pollutants 52 nitrosamines 52 carcinogens 52 toxic substances 52 PFOA 52 volatile organic compounds 52 VOCs 52 Sulfur dioxide 52 pesticide residues 52 VOC emissions 51 pollutant 51 Acrylamide 51 trace amounts 51 cyanuric acid 51 phthalate 51 toxins 51 fine particulates 51 ozone 51 toxicity 51 selenium 51 mercury 51 particulate 51 chloramines 51 polluted groundwater 51 dioxins 51 toxic pollutants 51 Concentrations 51 sodium benzoate 51 dioxin 51 pesticide residue 51 bacterial contamination 51 fecal coliform 51 PAHs 51 nitrates 50 particulates 50 sulfur dioxide 50 particulate matter 50 mg l 50 formaldehyde 50 phthalates 50 PBDEs 50 contamination 50 tritium 50 petroleum hydrocarbons 50 sulfates 50 sulfur dioxide SO2 50 sulphates 50 chlorpyrifos 50 chemicals 49 carcinogenic 49 nitrogen dioxide 49 fracking fluid 49 toxic vapors 49 fine particulate matter 49 exceedances 49 hexane 49 chloride 49 cadmium