2007/8 + 2016/17: Learmonth (Victoria) – Fluoride, Turbidity

Learmonth (Victoria) – Fluoride

In terms of naturally occurring ‘Calcium Fluoride’, in 2007/8 the towns of Waubra and Learmonth who both source their drinking water from bores recorded Fluoride levels of 2.1mg/L and 1.8mg/L respectively. The highest level recorded in the Northern Territory was 2.1mg/L at Warrabri (Ali Curung) in 2010.

Fluoride: ADWG Guideline: non-fluoridated water 1.5 milligrams per litre of drinking water
Fluoridated water 1.0 milligrams per litre of drinking water (rolling annual average). In Victoria, the Health (Fluoridation) Act 1973 states that the annual average for fluoride in drinking water shall not exceed a level of 1mg/L. It can be added to water supplies through the ‘Flurodose’ process. Fluoride is added to water either as fluosilicic acid (sometimes known as hydrofluosilicic acid) or sodium silicofluoride. It is sourced from superphosphate and is soluble.
Naturally occurring fluoride is almost insoluble and is known as calcium fluoride.

2016/17 – Learmonth Victoria) – Turbidity

2016/17: Learmonth Turbidity 9.1NTU

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.

Aesthetic: Based on aesthetic considerations, the turbidity should not exceed 5 NTU at the
consumer’s tap