Related by context. Frequent words. (Click for all words.) 42 contaminant 41 dioxins 41 perchlorate 39 contaminants 39 toxic substances 39 PBDEs 39 carcinogen 39 harmful chemicals 39 carcinogens 39 levels 38 acrylamide 38 toxins 38 toxic chemicals 37 harmful 37 arsenic 37 radioactive contamination 36 bisphenol 36 VOCs 36 nitrate 36 mercury 36 melamine 36 contamination 36 phthalates 35 benzene 35 chromium 35 hexavalent chromium 35 hydrogen sulfide 35 radioactive iodine 35 groundwater contamination 35 volatile organic compounds 35 cesium 35 toxin 35 potentially harmful 34 toxicity 34 radioactivity 34 nitrates 34 selenium 34 dioxin 34 toxics 34 dissolved oxygen 34 tritium 34 pollutant 34 pesticides 33 radioactive waste 33 toxic 33 Toxic Substances Control 33 unacceptably 33 concentrations 33 PFOA 33 air pollution 33 bacterial contamination 33 pollutants 32 cadmium 32 hazardous 32 ozone pollution 32 unhealthy 32 particulates 32 PCBs 32 BPA 32 neurotoxin 32 Water Quality 31 coliform bacteria 31 acceptable 31 strontium 31 unsafe 31 ppm 30 unsustainably 30 particulate matter 30 radon 30 pesticide 30 atrazine 30 fluoride 30 EPA 30 hazardous chemicals 30 iodine 30 turbidity 30 birth defects 30 groundwater 29 Bisphenol 29 radioactive 29 ozone 29 trace amounts 29 Environmental Protection Agency 29 radioactive particles 29 flame retardants 29 Environmental Quality 29 radiation 29 chloride 29 Toxic Substances 29 Levels 29 chlorine 28 hazardous waste 28 risk 28 contaminated soil 28 sodium 28 sediment 28 TCEQ 28 ppb 28 contaminated 28 intakes 28 chemicals