Water quality standards

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Dr Paul T Francis, MD Community Medicine College of Medicine, Zawia

Dr Paul T Francis, MD Community Medicine College of Medicine, Zawia

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Dr Paul T Francis, MD Community Medicine College of Medicine, Zawia

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Presentation transcript:

Water quality standards Dr Paul T Francis, MD Community Medicine College of Medicine, Zawia

Water quality standards Physical standards Turbidity. Turbidity is the presence of suspended particles which make the water ‘not-clear’. Drinking water must be clear Color. Drinking water should not have any color Taste and Odour. Drinking water should not have any bad taste or odor

Water quality standards Chemical standards Chloride – should not be more than 200mg/litre Calcium (hardness) – calcium should not be more than 100-300mg/litre pH – pH should be between 6.5-8.5

Water quality standards Biological standards E coli – must not be present in any 100 ml samples of drinking water Viruses – drinking water should not contain any virus Protozoa – drinking water should not contain any protozoa (amoeba) Cysts/eggs – drinking water should not contain any eggs of helminths

Water quality standards Biological quality of water is tested by ‘presumptive coliform test’ Samples of water are added to culture medium to see if coliforms grow in it