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WATER QUALITY

The quality of water from the Water Sources to consumers is evaluated through physical, chemical, and microbiological analysis of water samples from the water intake sources, water treatment plants, service reservoirs, and selected areas within the water distribution network in each of the 20 township that Water PNG has presence in.

All sampling and analytical work is performed by a NISIT (National Institute of Standard and Industrial Technology) registered laboratory. The Papua New Guinea (PNG) drinking water quality code of practice and the World Health Organisation (WHO) Drinking Water Quality Guidelines are the basis for Water PNG Water's water quality operations and monitoring.

 Water PNG publishes an Annual Drinking Water Quality Report which is a valuable resource for information on the PNG drinking water supply system and for recent data on the physical and chemical composition of PNG drinking water.

Typical Values for physical and chemical composition of Water PNG drinking water.

 Parameter

 

Units

 WHO Health Value

 Minimum Concentration

 Maximum Concentration

pH*

pH units

6.5-8.5*

7.0

8.0

Alkalinity 

mg/L as CaCO3

-

15

150

Colour (true)*

Pt-Co

10*

<1

<3.0

Turbidity*

NTU

5*

0.0 

3.0

Fluoride

mg/L

0.8-1.5*

0.3

0.9

Hardness*

mg/L

No min-300*

30

200

Iron*

mg/L

0.5*

<0.02

0.3

Manganese

mg/L

0.1

<0.005

0.01

Aluminium residual

mg/L

0.2*

0.01

0.05 

Copper

mg/L

1*

<0.001

0.50

FAC - Free Available residual Chlorine

mg/L

0.2-0.5*

>0.2

<0.6

TAC - Total Available residual Chlorine 

mg/L

0.2-0.5* 

>0.2

<0.6

Percentage FAC

%

85-100*

80

100

Total Coliform

C/100ml

Nil*

Nil

Nil

Faecal Coliform

C/100ml

Nil*

Nil

Nil

E Coli 

C/100ml

Nil*

Nil

Nil

TDS – Total Dissolve Solid

mg/L

1000*

 

 

Note: These values are based on water quality data reported in 2013-14.

*Current WHO health Guideline values

TDS consist of calcium, magnesium, potassium, sodium, bicarbonates, chlorides & sulphates.