Most probable number of organisms (MPN) present per
100 ml of water. This is an indicator of bacterial
2. Tests to investigate possible
source of bacterial contamination. These tests will be done only if the MPN
value is found unsatisfactory.
i. Confirmatory test for E.Coli
which indicates fecal contamination.
ii. Isolation of specific bacteria
such as Salmonella.
3. Physical indicators of
contamination: pH, Color, Odor, Turbidity, and Conductivity.
4. Chemical Indicators of
Contamination: (a) Ammonia, (b) Nitrites, and (c) Nitrates.
5.Mineral Content Estimation. These
test will assess whether the level of naturally dissolved minerals are
within permissible limits.
i. Total Hardness
which includes Calcium and Magnesium.
6. Indicators of Industrial
Pollution: Alkalinity Test.
7. Quality of Treatment Assessment.
8. Interpretation, based on test
results and sample collection record.