Presumptive count includes
Presumptive coliform test

In presumptive coliform test the most probable number of all coliform organisms (not only E.coh) are counted → Presumptive coliform count.

The methods are : -

Multiple tube method
Membrane filtration technique.


After analysing presumptive coliforrn count, E.coli count is confirmed by other tests, e.g., by Eijkman test or indole production..
No E. Coli
Coliform but not only E.
Gram negative bacilli
Any bacteria