2015/18 – Judbury (Tasmania) – E.coli, Colour, Iron, Turbidity

BOIL WATER ALERT

Judbury (Tasmania) – E.coli

August 6 2015: Judbury (Tasmania) – E.coli 6.9 MPN100/mL

August 7 2015: Judbury (Tasmania) – E.coli 1 MPN100/mL

September 3 2015: Judbury (Tasmania) – E.coli 1 MPN100/mL

September 9 2015: Judbury (Tasmania) – E.coli 2 MPN100/mL

September 16 2015: Judbury (Tasmania) – E.coli 11 MPN100/mL

September 23 2015: Judbury (Tasmania) – E.coli 9.5 MPN100/mL

September 30 2015: Judbury (Tasmania) – E.coli 51.2 MPN100/mL

October 14 2015: Judbury (Tasmania) – E.coli 1 MPN100/mL

November 4 2015: Judbury (Tasmania) – E.coli 2 MPN100/mL

November 18 2015: Judbury (Tasmania) – E.coli 1 MPN100/mL

November 25 2015: Judbury (Tasmania) – E.coli 2 MPN100/mL

December 2 2015: Judbury (Tasmania) – E.coli 2 MPN100/mL

December 12 2015: Judbury (Tasmania) – E.coli 3.1 MPN100/mL

December 30 2015: Judbury (Tasmania) – E.coli 2 MPN100/mL

January 13 2016: Judbury (Tasmania) – E.coli 3.1 MPN100/mL

January 20 2016: Judbury (Tasmania) – E.coli 5.2 MPN100/mL

January 27 2016: Judbury (Tasmania) – E.coli 1 MPN100/mL

February 3 2016: Judbury (Tasmania) – E.coli 20.1 MPN100/mL

February 10 2016: Judbury (Tasmania) – E.coli 19.9 MPN100/mL

February 17 2016: Judbury (Tasmania) – E.coli 120.1 MPN100/mL

February 23 2016: Judbury (Tasmania) – E.coli 38.4 MPN100/mL

March 2 2016: Judbury (Tasmania) – E.coli 20.3 MPN100/mL

March 9 2016: Judbury (Tasmania) – E.coli 5.2 MPN100/mL

March 16 2016: Judbury (Tasmania) – E.coli 5.2 MPN100/mL

March 23 2016: Judbury (Tasmania) – E.coli 22.8 MPN100/mL

March 30 2016: Judbury (Tasmania) – E.coli 9.7 MPN100/mL

April 6 2016: Judbury (Tasmania) – E.coli 8.5 MPN100/mL

April 13 2016: Judbury (Tasmania) – E.coli 3.1 MPN100/mL

April 20 2016: Judbury (Tasmania) – E.coli 2 MPN100/mL

April 28 2016: Judbury (Tasmania) – E.coli 1 MPN100/mL

May 4 2016: Judbury (Tasmania) – E.coli 435.2 MPN100/mL

May 11 2016: Judbury (Tasmania) – E.coli 20.3 MPN100/mL

May 18 2016: Judbury (Tasmania) – E.coli 6.3 MPN100/mL

May 25 2016: Judbury (Tasmania) – E.coli 3.1 MPN100/mL

June 23 2016: Judbury (Tasmania) – E.coli 6.3 MPN100/mL

2016/17: Judbury (Tasmania) – E.coli 9 exceedences. Poor microbiological performance can be attributed to a lack of barriers and the susceptibility to changes in quality from the Dora Creek.
The risk to public health is mitigated through the communication of the Permanent BWA to customers.

5/7/17: E.coli of 7.5 MPN/100mL in monthly compliance sample

6/9/17: E.coli of 32.7 MPN/100mL in monthly compliance sample

4/10/17: E.coli of 3.1 MPN/100mL in monthly compliance sample

6/12/17: E.coli of 16 MPN/100mL in monthly compliance sample

3/1/18: E.coli of 1 MPN/100mL in monthly compliance sample

7/2/18: E.coli of 18 MPN/100mL in monthly compliance sample

7/3/18: E.coli of 24.3 MPN/100mL in monthly compliance sample

6/6/18: E.coli of 1 MPN/100mL in monthly compliance sample

25/6/18: E.coli of 2 MPN/100mL in monthly compliance sample

Escherichia coli should not be detected in any 100 mL sample of drinking water. If detected
in drinking water, immediate action should be taken including investigation of potential
sources of faecal contamination.

“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 2011

Judbury (Tasmania) – Colour

August 7 2015: Judbury (Tasmania) – Colour Apparent 80 PCU

February 2 2016: Judbury (Tasmania) – Colour Apparent 15 PCU

2016/17: Judbury (Tasmania – Colour 29 HU (max), 15 HU (mean)

2017/18: Judbury (Tasmania) – Colour 73 HU (max) 41 (mean)

Based on aesthetic considerations, true colour in drinking water should not exceed 15 HU.

“… Colour is generally related to organic content, and while colour derived from natural sources such as humic and fulvic acids is not a health consideration, chlorination of such water can produce a variety of chlorinated organic compounds as by-products (see Section 6.3.2 on disinfection by-products). If the colour is high at the time of disinfection, then the water should be checked for disinfection by-products. It should be noted, however, that low colour at the time of disinfection does not necessarily mean that the concentration of disinfection by-products will be low…

Judbury – Tasmania – Iron

August 7 2016: Judbury (Tasmania) – Iron 546ug/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

 

 

Judbury – Tasmania – Turbidity

August 6 2015: Judbury (Tasmania) – Turbidity 6.63 NTU

September 2 2015: Judbury (Tasmania) – Turbidity 7.81 NTU

January 13 2016: Judbury (Tasmania) – Turbidity 5.27 NTU

May 4 2016: Judbury (Tasmania) – Turbidity 8.94 NTU

 

Chlorine-resistant pathogen reduction: Where filtration alone is used as the water treatment
process to address identified risks from Cryptosporidium and Giardia, it is essential
that filtration is optimised and consequently the target for the turbidity of water leaving
individual filters should be less than 0.2 NTU, and should not exceed 0.5 NTU at any time
Disinfection: A turbidity of less than 1 NTU is desirable at the time of disinfection with
chlorine unless a higher value can be validated in a specific context.
Aesthetic: Based on aesthetic considerations, the turbidity should not exceed 5 NTU at the
consumer’s tap.