Human faeces, animal wastes, oil, urea (urine), pesticides, herbicides, fruits, and vegetable wastes etc.
Nitrates, phosphates, metals Phosphorus and nitrogen
The organisms which cause cholera and typhoid The organisms which cause dysentery and diarrhoea
Organise into categories these impurities found in sewage

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Organisms which cause cholera and typhoid: Human faeces, animal wastes which may contaminate drinking water or food.
Organisms which cause diarrhoea and dysentry: Nitrates, phosphates, herbicides in the drinking water can cause diarrhoea. But main cause is the food and water contaminated with human faeces and animal waste.
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