2007/22: Kaltukatjura/Docker River (Northern Territory). Lead, Hardness, Iodine

Kaltukatjura/Docker River (Northern Territory) Lead

The highest lead level recorded in the Northern Territory in 2010 was 0.055mg/L at Kaltukatjura (Docker River) 2010.

2009/10: Kaltukatjara Lead 0.055mg/L

Lead Australian Drinking Water Guideline 0.01mg/L

“… Lead can be present in drinking water as a result of dissolution from natural sources, or from household plumbing systems containing lead. These may include lead in pipes, or in solder used to seal joints. The amount of lead dissolved will depend on a number of factors including pH, water hardness and the standing time of the water.

Lead is the most common of the heavy metals and is mined widely throughout the world. It is used in the production of lead acid batteries, solder, alloys, cable sheathing, paint pigments, rust inhibitors, ammunition, glazes and plastic stabilisers. The organo-lead compounds tetramethyl and tetraethyl lead are used extensively as anti-knock and lubricating compounds in gasoline…ADWG 2011

Kalkatjara/Docker River (Northern Territory) Hardness

2007/08: Kaltukatjara Hardness 288mg/L

2008/09: Kaltukatjara Hardness 282mg/L

2009/10: Kaltukatjara Hardness 273mg/L

2009/10: Kaltukatjara Hardness 278mg/L

2013/14: Kaltukatjara Hardness 277mg/L

2015/16: Kaltukatjara Hardness 293mg/L

2016/17: Kaltukatjara Hardness 264mg/L

2021/22: Kaltukatjara Hardness 300mg/L


“To minimise undesirable build‑up of scale in hot water systems, total hardness (as calcium
carbonate) in drinking water should not exceed 200 mg/L.

Hard water requires more soap than soft water to obtain a lather. It can also cause scale to form on hot water pipes and fittings. Hardness is caused primarily by the presence of calcium and magnesium ions, although other cations such as strontium, iron, manganese and barium can also contribute.”

Australian Drinking Water Guidelines 2011

Kaltukatjara/Docker River – (Northern Territory) – Iodine

2007/08: Kaltukatjara Iodine 0.16mg/L

Iodide: Based on health considerations, the concentration of iodide in drinking water should
not exceed 0.5 mg/L.
Iodine: No guideline value has been set for molecular iodine.
The element iodine is present naturally in seawater, nitrate minerals and seaweed, mostly in the form of iodide salts. It may be present in water due to leaching from salt and mineral deposits. Iodide can be oxidised to molecular iodine with strong disinfectants such as chlorine.
Molecular iodine solutions are used as antiseptics and as sanitising agents in hospitals and laboratories.
Iodine is occasionally used for the emergency disinfection of water for field use but is not used for disinfecting larger drinking water supplies. Iodide is used in pharmaceutical and photographic materials. Iodine has a taste threshold in water of about 0.15 mg/L.
Iodide occurs in cows’ milk and seafood. Some countries add iodide to table salt to compensate for iodide-deficient diets.