Related by context. Frequent words. (Click for all words.) 62 contaminate groundwater 61 contaminating groundwater 60 polluted runoff 59 stormwater runoff 58 toxic algae blooms 58 sediment runoff 56 Raw sewage 56 septic systems 56 creeks rivers 56 nutrient runoff 56 sewage discharges 55 polluted groundwater 55 contaminants 55 sewage overflows 54 streambeds 54 siltation 54 pollute groundwater 54 contaminate drinking 54 sewage 53 polluted 53 drainage 53 sediment 53 Ice jams 52 polluted waterways 52 detention basins 52 stormwater 52 wastewater discharges 52 beaver dams 52 retention basins 52 saltwater intrusion 52 sewer overflows 52 Creek tributary 52 rainwater runoff 52 groundwater 52 creeks streams 52 pollutants 52 septic tanks 51 sewage lagoon 51 nutrient pollution 51 stormwater drains 51 sewage spills 51 storm drains 51 storm sewers 51 outfalls 51 drainage ditches 51 fecal coliform bacteria 51 Toxic chemicals 51 sedimentation 50 stormwater drainage 50 waterways 50 effluent 50 bd.className + = 50 Polluted 50 heavily polluted 50 sewage overflow 50 wetlands 50 fecal coliform 50 overfishing pollution 50 contaminating 50 septic 50 Pollutants 50 raw sewage 50 sewage lagoons 50 sewer backups 49 algae blooms 49 pesticides fertilizers 49 silt 49 suspected carcinogen 49 pollution 49 Illegal dumping 49 retention ponds 49 stormwater pollution 49 Invasive species 49 Sediment 49 watersheds 49 Contaminants 48 livestock manure 48 wastewater 48 chlordane 48 untreated wastewater 48 untreated sewage 48 aquifer recharge 48 contaminate 48 soil erosion 48 aquifers 48 stagnant pools 48 clogged drains 48 Lake Tenkiller 48 Sinkholes 48 shoreline erosion 48 silting 48 toxic algae 48 sinkholes 48 lagoons 48 groundwater pumping 48 underground aquifers 48 sewer 48 water 48 drainage basins 48 overgrazing 48 Nitrates