Related by context. Frequent words. (Click for all words.) 59 manure 57 polluted groundwater 55 CAFOs 54 digesters 54 livestock manure 54 compost piles 53 methane 53 liquid manure 52 hydrogen sulfide 52 hog manure 51 CAFO 51 groundwater contamination 51 foul odors 51 noxious odors 51 hog barn 51 hog confinement 51 hog farms 50 anaerobic digesters 49 chicken manure 48 bio solids 48 pollutants 48 retention ponds 48 contaminants 48 fracking fluid 48 odors 48 methane gas 47 ash ponds 47 digester 47 volatile organic compounds 47 lagoons 47 toxic vapors 47 anaerobic digester 47 dairies 47 cow manure 47 gasoline vapors 46 biosolids 46 mold spores 46 wastewater discharge 46 vapors 46 unpleasant odors 46 harmful contaminants 46 sewage sludge 46 slurry 46 sediment runoff 46 contaminate groundwater 46 sludge 46 hexane 45 sewage discharges 45 pollution 45 ammonia 45 noxious chemicals 45 chemical vapors 45 septic tanks 45 suspected carcinogen 45 Odors 45 effluent 45 naturally occurring bacteria 45 pollutant 45 contaminant 45 detention basins 45 septic systems 45 coal slurry 45 coliforms 45 septic tank 45 confinements 45 toxic fumes 45 sediment 45 poultry manure 45 gases 44 barns 44 fumigants 44 carcinogenic chemicals 44 fermentation tanks 44 chlorides 44 smokestack emissions 44 contamination 44 vapor intrusion 44 pesticide drift 44 toxins 44 nutrient runoff 44 dissolved solids 44 stormwater runoff 44 total dissolved solids 44 pig farms 44 vinyl chloride 44 septic 44 poultry litter 44 landfills 44 Nitrates 44 byproducts 44 toxicants 43 sinkholes 43 toxic chemicals 43 droppings 43 fumigant 43 hazardous waste landfill 43 landfill 43 Sulfur dioxide 43 storage tanks 43 odorless colorless gas 43 mycotoxins