Related by context. Frequent words. (Click for all words.) 57 fracking 51 hydrofracking 50 hydraulic fracturing 50 Fracking 47 drillers 46 toxic chemicals 46 Safe Drinking Water 46 MTBE 46 contaminants 45 carcinogens 45 groundwater 45 toxic substances 44 pollutants 44 Polluters 44 groundwater contamination 44 Clean Water Act 44 underground aquifers 44 contaminant 43 toxics 43 drilling fluids 43 pollutant 43 harmful chemicals 42 polluters 42 carcinogen 41 aquifers 41 toxic pollutants 41 Contaminants 41 benzene 41 fecal coliform bacteria 41 methyl tertiary butyl ether 41 coal slurry 40 tar sands 40 polluted 40 Corexit 40 Marcellus Shale formation 40 hazardous chemicals 40 chemical additives 40 trace amounts 40 gasoline additive 40 chemicals 40 harmful pollutants 40 fecal bacteria 39 dispersants 39 fly ash 39 radionuclides 39 DEP 39 Perchlorate 39 pesticide residues 39 hydrogen sulfide 39 Pollutants 39 phthalate 39 hexavalent chromium 39 TCEQ 39 mercury pollution 39 PAHs 38 toxins 38 Benzene 38 Edwards Aquifer 38 nitrates 38 Environmental Protection 38 fecal coliform 38 DISCLOSE Act 38 aquifer 38 Clean Water Action 38 pollute 38 wastewater discharge 38 dispersant 38 bed methane 38 Sierra Club 38 Gas Drilling 38 shale deposits 38 coal ash 38 methane 38 underground piping 38 shale 38 combustible dust 38 tritium 38 DEQ 38 coal seams 38 ozone pollution 38 shale formations 38 toxic algae 38 mercury emissions 38 polluter 38 substances 38 additives 38 Marcellus Shale 37 TMDL 37 harmful substances 37 CAFOs 37 phthalates 37 pollution 37 contaminated groundwater 37 NRDC 37 PHMSA 37 coalbed methane 37 BOEMRE 37 cryptosporidium 37 watersheds 37 lobbyists 37 TSCA