1. Most probably number of organisms
(MPN) present per 100 ml of water.
This is an indicator of bacterial
2. Physical indicators of
contamination: pH, Color, Turbidity and Conductivity.
3. Chemical Indicators of
Contamination : (a) Ammonia, (b) Nitrites, and (c)
4. Total Hardness which includes
Calcium and Magnesium.
5. Confirmatory test for E.Coli
which indicates fecal contamination. This test
done only if the MPN value is found
6. Interpretation, based on test
results and sample collection record.