Microbiological Standards

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Microbiological standards

Water is monitored for organisms that may indicate the presence of harmful bacteria or viruses.

The presence of an indicator organism does not necessarily mean that the water is unsafe to drink, however any exceedance is investigated immediately.

 

Microbiological standards

Parameter

Description

Standard

E. coli and Enterococci

Bacteria found in the gut of humans and warm blooded animals. Their detection in water is an indication of faecal contamination. They are readily killed by disinfection but the occasional detection in drinking water can occur.

0 per 100 ml

Coliforms

Group of organisms widely found in the environment including soil, water and vegetation. Their presence in water may indicate faecal pollution has occurred. They are readily killed by disinfection but the occasional detection in drinking water can occur. 

0 per 100 ml

Clostridium perfringens

Bacterium that can produce spores that can persist in the environment for long periods of time. Their presence in water can indicate historic contamination.

0 per 100 ml

Colony counts measured at 22°C

General measure of the bacterial population within drinking water.

No abnormal change

 Key

Code/Units  

Description 

 °C

Degrees Centigrade 

 ml

Millilitre

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