Related by context. Frequent words. (Click for all words.) 68 ppb 62 total dissolved solids 60 ppm 59 nanograms per 58 mM 57 g l 57 pg mL 57 ng ml 56 coliforms 55 ng mL 55 alkalinity 55 nmol L 55 #ppm [001] 55 pH 55 ppm Cu 55 Sulfate 55 μg 54 micrograms 54 % P#O# 54 #mcg [003] 53 mmol L 53 sulphate 53 microgram 52 neutral pH 52 ml 52 tetrachlorethylene 52 PM# [003] 52 ppb Au 52 arsenic 52 fecal coliform bacteria 52 #.# oz Au 51 milligrams 51 maximum contaminant 51 Concentrations 51 gpt silver 51 mg kg 51 Nitrate 51 exceedances 51 #.#mg [004] 51 #g t [003] 50 per milliliter 50 fecal coliform 50 % MoS2 50 concentrations 50 chloride 50 Hg 50 coliform 50 sulfate 50 mg calcium 50 dissolved solids 50 alkaline phosphatase 50 bromate 50 Nb#O# 50 mL min 50 microgrammes 49 Oxides 49 iron manganese 49 SiO2 49 chromium 49 kPa 49 nitrate 49 ppb gold 49 IU mL 49 picograms 49 NaCl 49 #.#g t [006] 49 % Li2O 49 mg 49 turbidity 49 milligrams mg 49 mg d 49 g t AuEq 49 iodide 48 % eU#O# 48 ppm U#O# 48 mL 48 millisievert 48 Tg 48 #.#ppm [002] 48 sulfides 48 Nitrates 48 glomerular filtration rate 48 mg mL 48 g dL 47 oxidised 47 dissolved oxygen 47 #.#g t gold [004] 47 #.#g t gold [003] 47 arsenic mercury 47 samples assayed 47 μm 47 dL 47 copper Cu 47 suspended solids 47 cpht 47 chlorides 47 enterococci 47 % WO3 47 mg dl 47 ^ sup 47 arsenic contamination