The presence of coliform in drinking water supply is a symptom of ________.
Contamination by human waste
Coliform bacteria (such as E. coli) live in the intestines of humans and warm-blooded animals and are passed out in faeces.
Their presence in drinking water is therefore used as an indicator of faecal (sewage) contamination, which may also carry disease-causing germs of cholera, typhoid and diarrhoea.
Fluoride, phosphorus and salinity are chemical contaminants; they are detected by chemical tests, not by coliform counts.
Hence, Contamination by human waste.
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