Related by context. Frequent words. (Click for all words.) 62 arsenic 59 contaminant 58 tritium 58 groundwater 57 contaminants 56 nitrate 55 chromium 54 fluoride 54 nitrates 54 ppb 53 toxic chemicals 52 TCE 52 benzene 52 PFOA 51 contamination 51 phosphorus 50 PCBs 50 mercury 50 cadmium 49 carcinogen 49 BPA 49 Superfund site 49 Arsenic 49 radioactive iodine 48 phthalates 48 MTBE 48 selenium 48 pollutant 48 dioxin 48 pollutants 48 trace amounts 48 EPA 48 chloride 47 bisphenol 47 iodine 47 chlorine 47 dioxins 47 hazardous waste 47 contaminated soil 46 contaminated 46 E. coli bacteria 46 aquifer 45 cesium 45 harmful chemicals 45 melamine 45 ozone 45 hazardous chemicals 45 radioactivity 45 phosphorous 45 pesticide 45 Groundwater 44 pesticides 44 volatile organic compounds 44 carcinogens 44 wastewater 44 radon 44 Environmental Protection Agency 44 E. coli 44 sodium 44 Water Quality 43 toxins 43 radioactive waste 43 nitrogen 43 chemicals 43 chemical 43 micrograms 43 toxic substances 43 Environmental Quality 43 ammonia 42 radiation 42 depleted uranium 42 coal ash 42 manganese 42 VOCs 42 DEQ 42 effluent 42 toxicity 42 birth defects 42 hydrogen sulfide 41 PCE 41 radioactive 41 biosolids 41 organic compounds 41 particulates 41 toxin 41 infant formula 41 septic systems 41 TCEQ 41 radioactive material 41 leaching 40 air pollution 40 sediment 40 methane 40 water 40 mercury emissions 40 aquifers 40 organics 40 hazardous materials 39 toxic 39 particulate matter 39 sulfur dioxide