Related by context. Frequent words. (Click for all words.) 90 phosphorus 59 Phosphorus 58 phosphates 58 nitrogen 57 nitrates 56 nutrient 55 nitrate 55 chloride 54 phosphate 54 dissolved oxygen 53 arsenic 53 selenium 52 sulfate 52 algae blooms 52 pollutants 51 contaminant 50 radium 50 algae 50 sulfur 50 dioxins 50 dioxin 50 pollutant 50 toxic chemicals 49 turbidity 49 toxic substances 49 chlorine 49 sediment 48 contaminants 48 chemicals 48 toxins 48 toxin 48 boron 48 nutrients 47 mercury 47 chromium 47 ammonia 47 soils 47 fertilizer 46 salts 46 cyanide 46 manganese 46 tritium 46 nitrogen fertilizer 46 groundwater 45 cyanobacteria 45 sludge 45 stormwater runoff 45 depleted uranium 45 salinity 45 silt 45 chlorophyll 45 potassium 45 toxic 45 manure 45 perchlorate 45 iron oxide 45 biosolids 45 PCBs 44 pollution 44 calcium carbonate 44 sedimentation 44 effluent 44 fertilizers 44 hazardous chemicals 44 chemical 44 hexavalent chromium 44 sodium 44 sulfuric acid 43 impurities 43 sulfide 43 harmful chemicals 43 volatile organic compounds 43 acidic 43 hydrochloric acid 43 nitrogen oxide 43 particulate matter 42 phytoplankton 42 bacteria 42 hazardous waste 42 untreated sewage 42 pigment 42 discharges 42 leaching 42 strontium 42 sediments 42 iodine 42 cobalt 42 magnesium 42 E. coli bacteria 42 Nitrogen 42 fluoride 42 nutrient rich 41 carbon dioxide 41 carcinogenic 41 pesticides 41 toxicity 41 ammonium nitrate 41 caustic soda 41 concentrations 41 neurotoxin 41 silica