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acid alkalinity bacterial quality bacteriological examination biocoenosis biological examination bottle cadmium carbon dioxide carried chemical examination chemical substances coli coliform group coliform organisms Colony counts Colorimetric Colorimetric method COMBINATIONS OF POSITIVE concentration confidence limits considered contamination daily intake dental caries disinfection distribution system entering the distribution Examination of Water faecal streptococci filtered fluoride forms for reporting Frequency of sampling frequently giving positive reaction laboratory levels limit Upper limit litre Lower limit Upper medium membrane filtration membrane filtration method method.3 methyl orange mg/l ml each Lower nitrate Nitrosamines non-spore-forming Number of tubes P.O. Box pesticides piped possible present Public Health radiological examination radionuclides raw water recommended residual chlorine routine samples for bacteriological samples for virological Selenium sodium thiosulfate storage of samples supplies of drinking-water TABLE temperature tests thiocyanate tion transport and storage tubes giving positive viruses volume of water water entering water supply Windle Taylor World Health Organization