Related by context. Frequent words. (Click for all words.) 63 polluting groundwater 62 contaminating groundwater 61 contaminate drinking 60 contaminate groundwater 56 pollute groundwater 56 polluted groundwater 56 contaminates 53 deplete oxygen 52 groundwater 52 MtBE 52 acidify 51 groundwater aquifers 51 fracking fluids 51 Radioactive waste 51 Hydrogen sulfide 51 MTBE contamination 51 polluted 51 harmful contaminants 51 THMs 51 coal slurry 51 contaminating 51 bioaccumulation 51 contaminate 50 E coli bacteria 50 contaminants 50 tailing ponds 50 fracturing fluids 50 contaminated 50 fracking chemicals 50 discharging pollutants 50 shallow aquifer 50 hydro fracking 50 contamination 50 fracking 50 PCBs polychlorinated biphenyls 50 dissolved solids 49 fecal material 49 triclocarban 49 suspected carcinogen 49 manure spills 49 organochlorines 49 Dunkard Creek 49 fracking fluid 48 toxic solvents 48 nonpoint sources 48 wastewater discharges 48 contaminant 48 uncontaminated 48 mercury PCBs 48 sewage effluent 48 arsenic contamination 48 carbon tetrachloride 48 DBPs 48 herbicides pesticides 47 additive MTBE 47 Rotenone 47 groundwater contamination 47 total dissolved solids 47 phosphate mines 47 sediment runoff 47 aquifers 47 mold fungi 47 powerful neurotoxin 47 toxins 47 manure pits 47 fecal bacteria 47 toxic pollutant 46 sewage discharges 46 Paraquat 46 fecal coliform bacteria 46 iron manganese 46 nitrification 46 inland bays 46 byproducts 46 disinfection byproducts 46 arsenic mercury 46 BTEX 46 creeks rivers 46 naturally occurring bacteria 46 intermittent streams 46 bioaccumulate 46 dioxin contaminated 46 naturally occurring mineral 46 Wissahickon Creek 46 benzene toluene 46 oil sheens 46 Domoic acid 46 Thoroughly cooking 46 mountaintop removal mines 46 pollutes 46 sediment 46 Edge Moor 46 rotting vegetation 45 perfluorochemicals 45 wastewater effluent 45 animal droppings 45 underground aquifers 45 toxic byproducts 45 pollute 45 evaporation ponds 45 polycyclic aromatic hydrocarbons PAHs