Related by context. Frequent words. (Click for all words.) 65 total dissolved solids 65 maximum contaminant 63 tetrachlorethylene 61 fecal coliform bacteria 61 coliform 60 trihalomethanes 60 fecal coliform 59 turbidity 59 coliform bacteria 58 mg l 57 dissolved solids 56 exceedances 55 suspended solids 55 denitrification 55 contaminants 55 chloramine 55 enterococci 55 chloramines 54 fecal bacteria 54 dissolved oxygen levels 54 chlorination 54 arsenic 54 petroleum hydrocarbons 54 ppb 53 bromate 53 nitrate 53 contaminant 53 wastewater 53 wastewater discharge 52 alkalinity 52 leachate 52 perchlorate 52 dissolved oxygen 52 #,# dioxane 52 nitrates 52 hydrogen sulfide 52 groundwater 51 chromium 51 chlorine 51 tritium 51 sewage discharges 51 effluent 50 sewer overflows 50 bacteriological 50 radium 50 discharges 50 suspected carcinogen 50 benzene 50 microbial contamination 50 pretreatment 50 radionuclides 50 hexavalent chromium 50 chlorides 50 OEPA 50 TCE 50 particulate matter emissions 49 sodium hypochlorite 49 phosphorus 49 polychlorinated biphenyls PCBs 49 perchlorate contamination 49 trichlorethylene 49 methyl mercury 49 wastewater discharges 49 chloride 49 fecal contamination 49 arsenic contamination 49 per milliliter 49 radionuclide 48 vinyl chloride 48 toxicity 48 wastewater treatment 48 perchlorethylene 48 air toxics 48 particulate matter PM 48 dioxin 48 cyanuric acid 48 VOC emissions 48 mgd 48 Legionella bacteria 48 cryptosporidium 47 coli 47 chlorinated 47 PFOS 47 sedimentation 47 Cryptosporidium 47 pollutant 47 membrane filtration 47 H2S 47 Nitrate 47 nitrous oxides 47 outfalls 47 Nitrates 47 pesticide residue 47 sulfate 47 groundwater contamination 47 wellfield 47 disinfection 47 microbiological 47 hydrogen sulphide 47 THM 47 PCBs