Nathalia (Victoria) – Pesticides

1972 August: Amitrole 430μg/L – 2011 Australian Guideline Amitrole 0.9μg/L

Untitled document ‘Contamination Limits’ State Rivers and Water Supply Commission August 1972

Nathalia (Victoria) – Arsenic

Nathalia 0.03mg/L (Goulburn Murray Water 2002/3).

Arsenic: Australian Drinking Water Guideline = 0.01mg/L

Arsenic is bioaccumulative and symptoms may take 10-15 years to develop after expsoure at high levels. Drinking water can be contaminated with inorganic arsenic through wind blown dust, leaching or runoff from soil, rocks and sediment. Groundwater sources such as bores will usually have higher arsenic levels than surface water. In major Australian reticulated water supplies concentrations of arsenic range up to 0.015mg/L, with typical values less than
0.005mg/L. https://www.health.qld.gov.au/ph/documents/ehu/2676.pdf

2022/23: Nathalia (Victoria) Manganese

2022/23: Nathalia (Victoria) Manganese 0.63mg/L (max)

31/10/22: Oxidation of manganese following extensive flooding in the Broken Creek
catchment. It took approx. 3 days of tankering to dilute the manganese to an acceptable
level. In response to the issue GVW arranged for full  supply tankering equivalent to an average of  650kl per day for 10 days from the Numurkah  treated water supply system.

Manganese: ADWG Guidelines 0.5mg/L. ADWG Aesthetic Guideline 0.1mg/L
Manganese is found in the natural environment. Manganese in drinking water above 0.1mg/L can give water an unpleasant taste and stain plumbing fixtures and laundry.

Nathalia (Victoria)

Highest Detection only  2010/11

Nathalia 23ug/L Chloral Hydrate 2010/11

2004 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.02mg/L

2011 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.1mg/L

“Chloral hydrate is a disinfection by-product, arising from chlorination of water containing naturally occurring organic material (NOM). Chloral hydrate has only been detected by Goulburn Valley Water since changing to a new contract testing laboratory in November 2007. The Department of Health is currently conducting a study into the detection of chloral hydrate across Victoria.”