Territory Stories

2009 Annual drinking water quality report 2009, major and minor urban centres



2009 Annual drinking water quality report 2009, major and minor urban centres


Northern Territory. Power and Water Corporation


Annual drinking water quality report; Reports; PublicationNT




Made available via the Publications (Legal Deposit) Act 2004 (NT).; At foot of title: Indigenous Essential Services.




Northern Territory. Power and Water Corporation -- Periodicals; Water quality -- Management -- Northern Territory -- Periodicals; Water quality -- Northern Territory -- Periodicals

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Northern Territory. Power and Water Corporation

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v. : ill., maps ; 30 cm.

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Northern Territory. Power and Water Corporation

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IRON The Australian Drinking Water Guidelines recommend iron levels below 0.3mg/L which is believed to be around the taste threshold in drinking water. Levels above 3mg/L are believed to be objectionable. Iron bacteria concentrate iron and can cause issues with taste and odour as well as pipe restrictions and blockages. Iron generally occurs in drinking water as oxidised ferric or ferrous compounds, in surface waters it can complex with organic matter. Groundwater sources that are oxygen depleted have reportedly provided drinking water with iron concentrations up to 100mg/L. The concentration of iron at the customer tap can also be affected by factors such as rusting iron pipes. There are a number of communities regularly monitored for iron levels above 0.3mg/L and a limited number above 1mg/L (Figure 9). Power and Water investigated alternative groundwater sources for Nauiyu Nambiyu in 2008-09 and in the next two years a further three production bores will be equipped to reduce the iron levels. Options to reduce iron levels in the other communities with high levels are being investigated. Short-term solutions to reduce iron levels such as blending water supplies are being trialled. SODIUM Sodium is an essential element for humans, although there is currently no agreement on the minimum amount required. The sodium ion is widespread in water due to the high solubility of sodium salts and the abundance of mineral deposits. The Australian Drinking Water Guidelines recommend no more than 180mg/L, when the taste becomes appreciable. There are eight communities with mean sodium levels above 180mg/L (Figure 10). S d Iro n (m g/ L) 0.80 1.00 1.20 1.40 0.60 0.40 0.20 0.00 Aesthetic Guideline Value 0.3mg/L Ga liw in ku Na ui yu N am bi yu Nu m bu lw ar Pe pp im en ar ti Ba ru ng a Bu lla M in ye rri Ng uk ur r Pi ge on H ol e COMMUNITIES WITH AN AVERAGE IRON CONCENTRATION GREATER THAN 0.3MG/L IN THE DISTRIBUTION SYSTEM figure 9: So di um (m g/ L) Sodium Aesthetic Guideline Value 180mg/L DRINKING WATER SUPPLIES WITH AVERAGE SODIUM LEVELS GREATER THAN 180MG/L 0 50 100 150 200 250 300 350 Am an bi dj i DJ ilk m in gg an Al i C ur un g Nt ur iya Ta ra W ilo ra Im an pa Pa pu ny a figure 10: 32 power and water corporation

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