For the detection and enumeration of E. coli and coliform bacteria in water according to the ISO 9308-1 norm

Order References

Please use these references when
contacting your local distributor :

5000 mL Pack ………. EF342



Colonies Appearance

CHROMagar CCA ecoli

E. coli

metallic blue to violet

CHROMagar CCA coliform

Other coliforms

pink to red


Coliforms, Enterobacteriacae able to ferment lactose (lactose positive Enterobacteriacae), are bacteria present not only in human and warm blooded animals intestinal flora but also in the soil and water. Coliforms are proof of organic, environmental or faecal contamination. Faecal contamination, due to coliforms coming from animal waste, consists mainly of Escherichia coli and thermotolerant Klebsiella. Strict regulations exist for E. coli/coliform presence in water samples.

This can be explained by the importance of these germs in determining drinking water safety and process efficiency of treatment, storage and distribution.

1. Simultaneous detection and differentiation : CHROMagar™ CCA allows simultaneous detection and differentiation between E. coli and coliforms in one medium! This is helpful to determine if there is organic contamination (coliforms) or faecal contamination (E. coli). The use of this technique involves less work in comparison with traditional methods (MI Agar).

2. Easy to read: Easy counting of E. coli and coliform bacteria by the colour.

3. Convenient: Especially suitable for waters with low bacterial numbers that will cause less than 100 total colonies, like drinking water, disinfected pool water, or finished water from drinking water treatment plants.


Technical Documents

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Scientific Publications

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