Related by context. Frequent words. (Click for all words.) 68 contaminate groundwater 65 contaminating groundwater 62 contaminate drinking 60 groundwater 60 pollute groundwater 59 aquifers 57 fracking fluids 56 sewage effluent 56 underground aquifers 56 underground aquifer 56 tailing ponds 56 polluted groundwater 55 deplete oxygen 55 fracking chemicals 55 harmful contaminants 55 aquifer 54 toxic byproducts 54 fracking fluid 53 contaminating 53 evaporation ponds 52 contaminate 52 groundwater extraction 52 reinjection 52 contaminants 52 aquifer recharge 52 Toxic chemicals 51 Raw sewage 51 fracking 51 leaching 51 wellfields 51 dissolved solids 50 pollute 50 suspected carcinogen 50 sediment 50 wastewater discharges 50 contaminated groundwater 50 Soil erosion 50 seabeds 50 mine tailings 50 Hydrogen sulfide 50 sludges 50 Floridan Aquifer 50 intermittent streams 50 wastewaters 50 Great Artesian Basin 49 disinfection byproducts 49 coal slurry 49 groundwater pumping 49 discharges 49 Acidic 49 carcinogenic chemicals 49 MtBE 49 chlorinated solvents 48 reservoir 48 poisonous chemicals 48 bioaccumulation 48 naturally occurring radioactive 48 arsenic mercury 48 sequester carbon dioxide 48 Nitrates 48 treated effluent 48 frack 48 toxic chemicals 48 depletion 48 reservoirs 48 subsurface 48 wastewater 48 toxic wastes 48 water 48 contaminates 48 corrosives 48 hydraulic fracturing 48 aquatic organisms 48 toxic substances 48 polluted 48 headwater streams 48 Hydraulic fracturing 48 contaminant 48 contaminated sediments 47 streambeds 47 flouride 47 sewage discharges 47 groundwater basin 47 creeks rivers 47 PCBs polychlorinated biphenyls 47 Effluent 47 total dissolved solids 47 tailings 47 Hydrochloric acid 47 dewatering 47 radioactive contaminants 47 fertilizers pesticides 47 leach 47 saltwater intrusion 47 Contaminants 47 coalbed methane wells 47 toxic pollutants 47 sediment runoff 47 herbicides pesticides 46 frac sand 46 potent neurotoxin