2004-14: Tantawanglo-Kiah (New South Wales) – E.coli, Lead, Iron

2004 – 2014 Tantawanglo-Kiah (New South Wales) – E.coli
From a total of 2,246 samples, 6 E. coli detections occurred from 1 Jan 2004 to 31 Mar 2014.
Detection dates: 07/01/2004, 12/07/2005, 31/10/2005, 04/01/2006, and 24/01/2011. The
highest E. coli detection of 4 cfu/100 mL occurred on 4 Jan 2006 and 24 Jan 2011, both at sample site 412 in Candelo. No E. coli detections have occurred since 24 Jan 2011.

Thermotolerant coliforms are a sub-group of coliforms that are able to grow at 44.5 ± 0.2°C. E. coli is the most common thermotolerant coliform present in faeces and is regarded as the most specific indicator of recent faecal contamination because generally it is not capable of growth in the environment. In contrast, some other thermotolerant coliforms (including strains of Klebsiella, Citrobacter and Enterobacter) are able to grow in the environment and their presence is not necessarily related to faecal contamination. While tests for thermotolerant coliforms can be simpler than for E. coli, E. coli is considered a superior indicator for detecting faecal contamination…” ADWG

2004-14 Tantawangalo-Kiah (NSW) – Lead

2004/14 – Tantawangalo-Kiah (NSW) – Lead 0.02mg/L (max)

From a total of 246 samples, 5 exceedances occurred from 1 Jan 2004 to 31 Mar 2014.

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

2004-14 Tantawangalo-Kiah (NSW) – Iron

2004/14 – Tantawangalo-Kiah (NSW) – Iron 0.72mg/L (max)

From a total of 246 samples, 5 exceedances occurred from 1 Jan 2004 to 31 Mar 2014. The ADWG value for iron based on aesthetic considerations is 0.3 mg/L.

Based on aesthetic considerations (precipitation of iron from solution and taste),
the concentration of iron in drinking water should not exceed 0.3 mg/L.
No health-based guideline value has been set for iron.

Iron has a taste threshold of about 0.3 mg/L in water, and becomes objectionable above 3 mg/L. High iron concentrations give water an undesirable rust-brown appearance and can cause staining of laundry and plumbing fittings, fouling of ion-exchange softeners, and blockages in irrigation systems. Growths of iron bacteria, which concentrate iron, may cause taste and odour problems and lead to pipe restrictions, blockages and corrosion. ADWG 2011