Related by context. Frequent words. (Click for all words.) 67 shallow aquifer 60 underground aquifer 59 aquifers 59 underground aquifers 58 Floridan Aquifer 58 aquifer 57 Floridan aquifer 55 Ogallala aquifer 54 groundwater aquifers 53 groundwater 53 Aquifers 53 water 52 naturally occurring arsenic 52 trichloroethene 52 porous limestone 51 wellfields 51 saline aquifers 50 artesian wells 50 reservoir 50 mineral salts 50 Reverse osmosis 50 Aquifer 50 groundwater basin 49 wastewater effluent 49 bd.className + = 49 groundwater plume 49 wellfield 49 brackish 49 Septic tanks 48 hydrocarbon reservoirs 48 Hetch Hetchy Reservoir 48 ultraviolet disinfection 48 evaporation ponds 48 brine 47 artesian 47 reservoirs 47 dissolved solids 47 streambanks 47 irrigating crops 47 desalinated 47 de ionized 46 recharge groundwater 46 polluted groundwater 46 Marcellus shale formation 46 naturally occurring mineral 46 geologic formations 46 sewage effluent 46 magma chamber 46 Contaminated soil 46 deplete oxygen 46 dewatered 46 carbonic acid 46 brines 46 waterlines 45 decomposing garbage 45 recirculates 45 desalinization plant 45 tannic acid 45 wastewater 45 sediment 45 arsenic concentrations 45 calcium oxide 45 total dissolved solids 45 irrigate crops 45 superheated steam 45 Kuan Yin Taiwan 45 Odd numbered addresses 45 feedwater 45 Treated sludge 44 Carefully pour 44 sludges 44 limestone quarries 44 desalinization plants 44 stormwater ponds 44 corrosive fluids 44 Potable water 44 exhaust aftertreatment 44 embayment 44 E. Coli bacteria 44 replenishable 44 Wachusett Reservoir 44 sulfide minerals 44 mudstones 44 treated effluent 44 Hydrogen sulfide 44 decaying vegetation 44 Ogallala Aquifer 44 Raw sewage 44 nitrate concentrations 44 Pueblo Reservoir 44 groundwater basins 44 nearest hydrant 44 hydrologic cycle 44 coulees 44 tritiated water 44 sanitary sewage 44 dentine 44 chloramines 43 Slowly pour 43 l h 43 sewer mains