Related by context. Frequent words. (Click for all words.) 75 mercury arsenic 66 iron manganese 65 arsenic cadmium 61 arsenic 58 barium 58 lead mercury cadmium 57 polychlorinated biphenyls PCBs 57 pathfinder elements 55 methyl mercury 55 contaminants 55 furans 55 toxic pollutants 55 chlordane 54 carcinogenic chemicals 54 chromium 54 carcinogens 53 selenium 53 hexavalent chromium 53 pollutants 53 sulphates 53 dioxins 53 total dissolved solids 53 harmful contaminants 53 americium 53 tetrachlorethylene 53 hydrogen chloride 53 toxins 53 suspected carcinogen 53 polycyclic aromatic hydrocarbons 52 contaminant 52 Sulfate 52 toxicants 52 fecal coliform 52 harmful toxins 52 concentrations 52 toxic substances 52 toxic chemicals 52 iron oxides 52 mercury 52 Toxic chemicals 52 Sulfur dioxide 52 chlorinated solvents 52 radionuclides 51 PAHs 51 calcium magnesium 51 fecal coliform bacteria 51 bismuth 51 manganese 51 sulfides 51 dissolved solids 51 antimony 51 Arsenic 50 fecal bacteria 50 sulphate 50 harmful substances 50 carcinogen 50 Contaminants 50 trace amounts 50 harmful chemicals 50 nitrates 50 trichlorethylene 50 strontium 50 acrolein 49 sulfate 49 radioactive substances 49 toxic byproducts 49 Sediments 49 sulfur dioxide nitrogen oxide 49 galena 49 zinc 49 poisonous chemicals 49 benzene 49 dioxide 49 polychlorinated biphenyls 49 copper Cu 48 g t Pt 48 fine particulates 48 copper zinc 48 polycyclic aromatic hydrocarbons PAHs 48 coliforms 48 pollutant 48 contaminating groundwater 48 trihalomethanes 48 radioactive 48 bornite 48 hormone disrupting 48 Concentrations 48 solvents 48 radium 48 Pollutants 48 Dioxins 48 endocrine disruptors 48 sulfates 48 hazardous substances 48 radon 48 methylene chloride 48 carcinogenic 47 PBDE 47 ppm Cu 47 sulfur oxide 47 potentially carcinogenic