2014/16 – Hughenden (Queensland) – E.coli, Lead, Antimony, Iron

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2016 Nov: Hughenden (Queensland) – E.coli
Incident Description: The non-compliance was a detection of E.coli from a routine sample taken on the 23/11/2016 at an outside tap located on the Western side of the Helicopter pad. 7.5 mpn
E.coli organisms were detected, with a disinfection level of 0mg/L.
Corrective and Preventative Actions: The non-compliance was reported to the regulators, Qld Health and the DON. The Reservoir was dosed again and follow samples were taken. Dosing in Hughenden was increased to 3 times a week. The Hospital now has their own disinfection system to ensure they maintain chlorine residuals in excess of 0.5mg/L
Flinders Regional Council Drinking Water Quality Management Plan 2016/17

“Coliforms are Gram-negative, non-spore-forming, rod-shaped bacteria that are capable of aerobic and facultative anaerobic growth in the presence of bile salts or other surface active agents with similar growth-inhibiting properties. They are found in large numbers in the faeces of humans and other warm-blooded animals, but many species also occur in the environment.

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

2014/16: Hughenden (Queensland) – Lead
2015/16: Hughenden (Queensland) – Lead 0.01mg/L(max)
Hughenden Incident Incident Description: A reading of 0.12mg/L was detected.
Corrective and Preventative Actions: The tap and the reticulation mains were flushed. Further
samples were taken. Other samples taken from different points in the reticulation were compared against the samples form the WTP. The other samples taken on the same day and the additional samples taken from the WTP reported below the Health limit. Council now regularly flushes the water mains in order to assist in the movement of sediment in the mains. Regularly testing of the reticulation network occurs.
Flinders Shire Drinking Water Quality Management Plan 2014/15

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

2016/17 – Hughenden (Queensland) – Antimony

2016/17: Hughenden (Queensland) – Antimony 0.086mg/L “(Bore 2 returned a reading of 0.0086 mg/L. All remaining bores and reticulation samples returned readings of <0.0001mg/L. After discussing exceedance with Council’s designated regulator contact it was determined that the exceedance was not reportable as it had diluted before it reached the reticulation).” Flinders Shire Council Drinking Water Quality Management Plan 2016/17.

Antimony: ADWG Guideline 0.003mg/L. Antimony shows similar toxic effects as arsenic. Can be a problem with antimony-tin solder.

Hughenden (Queensland) – Iron

2016/17: Hughenden (Queensland)  – Iron 5.6mg/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