Related by context. Frequent words. (Click for all words.) 70 fracking fluid 68 fracking fluids 59 petroleum distillates 59 frac fluid 57 fracking chemicals 56 dissolved solids 56 hydraulic fracturing 55 elemental sulfur 55 MtBE 55 disinfection byproducts 55 hydrofluoric acid 55 coalbed methane wells 55 Hydrogen sulfide 54 kerogen 53 corrosives 53 contaminating groundwater 53 potassium hydroxide 53 flowback 53 phosphine 53 Hydrochloric acid 53 chemical additives 53 fracing 53 methylene chloride 52 chloramine 52 chemicals 52 contaminate groundwater 52 drilling fluids 52 fracking 52 reinjection 52 frac sand 52 colorless liquid 51 additive MTBE 51 chlorine 51 Horizontal drilling 51 chlorinated solvents 51 isopropyl alcohol 51 chloramines 51 naturally occurring radioactive 51 harmful contaminants 51 carbon tetrachloride 51 potassium permanganate 51 solvents 51 total dissolved solids 50 corrosion inhibitor 50 sorbents 50 chlorides 50 fly ash 50 absorbents 50 mercaptan 50 suspected carcinogen 50 polluted groundwater 50 hydrogen sulfide 50 Solvents 50 hydrocarbons 50 carbonic acid 50 sodium nitrate 50 toxic byproducts 49 vinyl acetate 49 Hydraulic fracturing 49 mineral salts 49 additives 49 aluminum sulfate 49 hexane 49 proppant 49 biocide 49 wood preservative 49 COGCC 49 anaerobic bacteria 49 Dispersants 49 dispersants 49 hydroxide 49 Marcellus wells 49 chemical solvents 49 petrolatum 49 brine 49 oxidizers 48 adsorbent 48 contaminants 48 nitric acid 48 organic solvents 48 chlorine dioxide 48 Aquifers 48 Chesapeake Appalachia 48 dispersant chemicals 48 nonhazardous 48 carcinogenic chemicals 48 Floridan Aquifer 48 biogenic 48 Bromine 48 coagulant 48 quicklime 48 portland cement 48 H2S 48 sulfur 48 Sulfate 48 activated charcoal 48 dispersant 48 drillers 48 groundwater 48 frack 48 mixtures