Related by context. Frequent words. (Click for all words.) 59 arsenic 58 PFOS 57 ppb 57 trihalomethanes 57 fecal coliform bacteria 57 hexavalent chromium 55 perchlorate 55 arsenic contamination 55 #,# dioxane 54 fecal bacteria 54 coliform bacteria 54 contaminants 53 trace amounts 53 PFCs 53 perchlorethylene 53 contaminant 53 trichlorethylene 52 E. coli bacteria 52 fecal coliform 52 carcinogen 51 methyl mercury 51 cyanuric acid 51 Cryptosporidium 51 dioxin 51 coliform 51 PFOA 51 nitrates 51 PBDE 51 endocrine disruptors 51 Nitrates 50 PCBs 50 polychlorinated biphenyls PCBs 50 dioxins 50 fluoride 50 chlorpyrifos 50 cryptosporidium 50 organophosphates 49 toxin 49 E. coli 49 triclosan 49 PAHs 49 radium 49 mg l 49 contamination 49 malathion 48 atrazine 48 human carcinogen 48 picocuries per 48 chromium 48 groundwater contamination 48 vinyl chloride 48 microgram 48 tritium 48 carcinogens 48 nitrate 48 micrograms 48 benzene 48 nanograms per 47 Perchlorate 47 concentrations 47 pesticide residues 47 infected mosquitoes 47 Contaminants 46 fecal contamination 46 Arsenic 46 coli 46 groundwater 46 mercury contamination 46 PCB contamination 46 PBDEs 46 TCE 46 Atrazine 46 radioactive cesium 46 contaminate groundwater 46 pesticides 46 phthalates 46 Superfund site 46 Minnesota Pollution Control 45 BPA 45 mosquito pools 45 bacteria 45 radon 45 radioactive tritium 45 polycyclic aromatic hydrocarbons 45 toxicity 45 hydrogen sulfide 45 polychlorinated biphenyls 45 nanograms 45 e coli 45 becquerels 45 Nitrate 45 carcinogenic 45 bacterial contamination 45 MPCA 45 endotoxin 44 turbidity 44 ATSDR 44 Elevated levels 44 pesticide 44 contaminated 44 pesticide residue