Related by context. Frequent words. (Click for all words.) 50 water 50 underground aquifer 48 Raw sewage 48 Elevation normal 47 groundwater 46 contaminating groundwater 45 Ogallala Aquifer 45 aquifer 45 underground aquifers 45 unnamed tributary 45 fecal coliform bacteria 45 wastewater 44 reservoirs 43 reservoir 43 untreated wastewater 43 Bend Reservoir 43 polluted groundwater 43 fecal contamination 43 chloramines 43 upstream 43 tailwater 43 river 42 hazmat crews 42 sewage 42 creek 42 sewage discharges 42 fecal bacteria 42 untreated sewage 42 creeks 42 downstream 42 fracking fluid 42 contaminants 42 Creek tributary 42 contaminated groundwater 42 seepage 42 chlorine leak 42 Saylorville Lake 42 groundwater contamination 41 fecal coliform 41 floodwater 41 downriver 41 oily sheen 41 total dissolved solids 41 raw sewage 41 River tributary 41 Floodwater 41 injection wells 41 chlorine 41 wastewater treatment 41 River basin 41 rivers 41 tailrace 41 tar mats 40 contaminate groundwater 40 cfs 40 sewage spills 40 aquifers 40 ice jams 40 Hydrochloric acid 40 drinkable water 40 brackish water 40 gallons 40 sewer overflows 40 potable 40 fracking fluids 40 contaminate drinking 40 upstream reservoirs 39 sewage overflow 39 Talmadge Creek 39 cryptosporidiosis 39 pollution 39 mgd 39 headwaters 39 effluent 39 wellfield 39 turbidity 39 treated effluent 39 rainbow sheen 39 lakes 39 rivers lakes 39 groundwater pumping 39 storm sewers 39 polluted runoff 39 wastewater discharges 39 waterways 39 evaporation ponds 39 sewage lagoon 39 heaviest rainfall 39 swollen creek 39 contamination 39 lake 39 Train derailment 38 lakh cusecs 38 turbid 38 pollutants 38 brine 38 Tar balls 38 rivers creeks 38 Fitzroy River 38 tanker trucks 38 Angat Dam