Harrietville (Victoria) – Turbidity
7/09/10 –16/09/10 Harrietville Boil Water Notice Heavy rainfall resulted in increased turbidity at both source waters. As this site is unfiltered a precautionary BWN was implemented to reduce risk.
2010/11: Harrietville Turbidity 9.1NTU
2011/12: Harrietville Turbidity 5.3NTU
Australian Drinking Water Guideline 5NTU
Chlorine-resistant pathogen reduction: Where filtration alone is used as the water treatment
process to address identified risks from Cryptosporidium and Giardia, it is essential
that filtration is optimised and consequently the target for the turbidity of water leaving
individual filters should be less than 0.2 NTU, and should not exceed 0.5 NTU at any time
Disinfection: A turbidity of less than 1 NTU is desirable at the time of disinfection with
chlorine unless a higher value can be validated in a specific context.