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

2. 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

3. Water quality standards
Chemical standards
Chloride – should not be more than 200mg/litre
Calcium (hardness) – calcium should not be more than mg/litre
pH – pH should be between

4. 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

5. 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