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-> Quarterly Water Quality Reports -> Fourth Quarter 2003/2004 -> Water Quality Data

 

Ryde Customer Supply System

RYDE CUSTOMER SUPPLY SYSTEM (1 July 2003 to 30 June 2004)

(delivering to an estimated population of 647,870) ***

CHARACTERISTICS
Actual test results for 12 months from1 July 2003 to 30 June 2004 taken from customers tap
Units of Measure
Australian Drinking Water Guidelines (ADWG) performance standard (assessment over 12 month period).

No. of samples

  Min  

  Max  

Average

Met
1996 ADW Guidelines*

MICROBIOLOGICAL

Total Coliforms (TC)
At least 95% results contain no TC's

1008

0

>200

-

98

 

E. coli****
At least 98% results contain no EC's

1008

0

0

-

100

 

PHYSICAL/CHEMICAL

Fluoride**
At least 95% results 0.9 to 1.5 mg/L

120

1

1.2

1.1

100

 

Chlorine

 Chlorine
At least 95% results less than 5 mg/L

1008

0

0.38

0

100
 
Mono- chloramine
At least 95% results less than 3 mg/L

1008

0

1.65

1.08
100

 

Manganese
Mean results less than 0.1 mg/L

120

<0.001

0.005

0.001

100

 

Turbidity
NTU
Mean results less than 5 NTU

1008

0.07

2.43

0.12

100

 

True Colour
HU
Mean results less than 15 HU

24

<2

3

<2

100

 

Iron
Mean results less than 0.3 mg/L

120

<0.005

0.07

0.012

100

 

Aluminium
Mean results less than 0.2 mg/L

24

<0.010

0.021

0.012

100

 

Trihalomethanes (THM's)
95% results less than 0.25 mg/L

48

0.017

0.067

0.032
100

pH
pH (pH Units)
Mean results 6.5 - 8.5

1008

7.3

9.2

8.2

97.7

 

Zinc
Average of test results less than 3 mg/L

24

<0.005

0.006

<0.005

100

 


The Australian Drinking Water Guidelines 1996 recognise that occasionally throughout the year there may be health or aesthetic related test results above the Guidelines values, and that these results are not necessarily an immediate threat to health. The Guidelines do not require a 100% result in all cases. Disturbances and operational changes can result in occasional localised elevated levels of aesthetic water quality characteristics such as pH. Each test result above the guideline value for Total Coliform is investigated and actions taken where necessary to minimise the risk of a recurrence.

* 1996 Australian Drinking Water Guidelines (ADWG).

** Although the ADWG specifies that 95% of fluoride test results should be less than 1.5 mg/L, the Fluoridation of Public Water Supplies Act 1957 requires that, over a year, greater than 95 % of all routine fluoride samples fall within the range 0.90 to 1.50 mg/L.

***Estimated population as at June 30, 2003

**** On the 1/7/2003 the laboratory method for the detection and enumeration of Total coliforms and E. coli was changed from Membrane Filtration to the Colilert method. Where no coliforms or E. Coli are detected, the Colilert method states they are presented as <1 orgs/100mL - for the purposes of this report they have been treated as 0.
# This table includes the test results for key characteristics only. For additional test results please contact Sydney Water.