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acid activity alkalinity Atomic absorption spectrophotometric bacterial quality bacteriological examination biocoenosis biological examination bottle cadmium carried chemical examination chemical substances coli coliform group coliform organisms Colony counts Colorimetric Colorimetric method COMBINATIONS OF POSITIVE concentration confidence limits contamination daily intake dental caries disinfection distribution system entering the distribution examination of water faecal streptococci filtered fluoride forms for reporting Frequency of sampling laboratory limit Upper limit litre Lower limit Upper medium membrane filtration membrane filtration method Methyl orange mg/l MPN AND 95 nitrate Nitrosamines non-spore-forming Number of tubes P.O. Box pesticides piped present Public Health radiological examination raw water recommended reference number reporting the results residual chlorine samples for bacteriological Selenium sodium thiosulfate spectrophotometric storage of samples sulfanilic acid supplies of drinking-water TABLE Taste temperature tests thiocyanate tion transport and storage treatment virological virus viruses volume of water water entering water supply Windle Taylor World Health Organization