Related by context. Frequent words. (Click for all words.) 58 chlorides 53 arsenic mercury 52 mercury arsenic 50 pollute groundwater 49 toxic pollutant 49 Hydrogen sulfide 48 total dissolved solids 48 corrosives 48 dissolved solids 48 intermittent streams 47 fracturing fluids 47 naturally occurring radioactive 46 fracking chemicals 46 contaminate groundwater 45 cadmium mercury 45 Acidic 45 iron manganese 45 harmful contaminants 45 fracking fluid 45 contaminants 45 heavily polluted 44 acidify 44 Coliform bacteria 44 disinfection byproducts 44 contaminating groundwater 44 fracking fluids 44 suspected carcinogen 44 benzene toluene 44 THMs 44 deplete oxygen 43 Nitrogen oxides 43 potent neurotoxin 43 oxidising 42 furans 42 Sulfate 42 Stormwater runoff 42 fluorides 42 acidic 42 tailing ponds 42 * Potentially libelous 42 remove impurities 42 nitrogen phosphorous 42 creeks streams 42 red sludge 41 wastewater discharges 41 residues 41 adsorb 41 Diesel exhaust 41 carcinogenic chemicals 41 toxic substances 41 pollutants 41 Sulfur dioxide 41 hydroxide 41 iron oxides 41 pollutant 41 mercury cadmium 41 nonhazardous 41 endocrine disruptor 41 lead mercury cadmium 41 PCBs polychlorinated biphenyls 41 bioaccumulation 41 noxious 41 rotting vegetation 40 petroleum distillates 40 toxicants 40 sediment 40 Hydrochloric acid 40 acrolein 40 contaminant 40 silts 40 fatty substances 40 polluted 40 DBPs 40 potentially harmful 40 trace amounts 40 toxins 40 toxic byproducts 40 naturally occurring asbestos 40 sludges 40 hazardous 40 Thoroughly cooking 40 impurities 40 Contaminants 40 nitrogen phosphorus 40 sulphates 40 friable 40 arsenate 40 Aquifers 39 excretions 39 streambeds 39 harmful toxins 39 slurries 39 americium 39 Sediment 39 contaminate drinking 39 toxic pollutants 39 wastewater effluent 39 frac fluid 39 Radioactive waste 39 ash ponds 39 leachable