Water Hardness - Hunter Water
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1FACT SHEET MAY 2014
WATER HARDNESS
HARDNESS REFERS TO THE AMOUNT OF
CALCIUM AND MAGNESIUM SALTS IN WATER
AND IS THE CHARACTERISTIC THAT AFFECTS
LATHERING OF SOAP AND SCALING OF HOT
WATER PIPES, FITTINGS AND HEATERS.
HOW IS HARDNESS MEASURED?
AREAS SUPPLIED BY HUNTER WATER TREATMENT PLANTS
Ranges of hardness, usually
Areas supplied by Hunter Water Corporation may be supplied by one or more
Water Treatment Plants (WTP):
expressed in units of milligrams per
litre (mg/L) of equivalent Calcium
WATER SUPPLY AREA
TYPICALLY
CAN BE
Carbonate (CaCO3) are rated by
SUPPLIED BY
SUPPLIED BY
the National Health and Medical
Newcastle, Lake Macquarie
Grahamstown WTP &
Grahamstown WTP
Research Council (NHMRC)
Dungog WTP
Australian Drinking Water Quality
Guidelines as follows:
Raymond Terrace, Tomago,
Grahamstown WTP
Grahamstown WTP &
Medowie, Stockton, Kooragang
Dungog WTP
Dungog, Paterson, Vacy, Martins Creek,
Dungog WTP
Grahamstown WTP &
<60 mg/L
Soft but possibly
Clarencetown, Seaham, Thornton,
Dungog WTP
corrosive
Maitland, Kurri, Cessnock, Branxton,
Tarro, Beresfield
60-200 mg/L
Good quality
Anna Bay, Salamander, Soldiers Point,
Anna Bay WTP &
Grahamstown WTP
Boat Harbour, Fishermans Bay, Corlette
Grahamstown WTP
200-500 mg/L Increasing scaling
Nelson Bay, Fingal Bay, Shoal Bay
Nelson Bay WTP,
Nelson Bay WTP
problems
Grahamstown WTP & Anna
>500 mg/L
Severe scaling
Bay WTP
Lemon Tree Passage, Karuah,
Lemon Tree Passage WTP
Mallabula, Oyster Cove, Swan Bay
Virtually all drinking waters available
Gresford, East Gresford
Gresford WTP
on the east coast of Australia can be
described as either soft or of “good
TYPICAL HARDNESS OF DRINKING WATER SUPPLIED BY HUNTER
quality” and the table below shows
WATER CORPORATION
that all Hunter Water sources fall into
this category.
SOURCE
mg/L Calcium
GERMAN
FRENCH
mmol/L
Waters supplied by Hunter Water
Carbonate (CaCO3) -
DEGREES
DEGREES
equivalent to parts per
Corporation are soft non-scaling
million (ppm) Calcium
waters at room temperature. The
Carbonate
tables below set out areas supplied
by different water treatment plants,
Grahamstown
30 - 105
1.68 – 5.88
3 – 10.5
0.3 – 1.05
Water Treatment
and typical hardness of waters
Plant
supplied by Hunter Water, expressed
in various units.
Dungog Water
15 - 55
0.84 – 3.08
1.5 – 5.5
0.15 – 0.55
Treatment Plant
Anna Bay Water
40 - 85
2.24 – 4.76
4 – 8.5
0.4 – 0.85
Treatment Plant
Nelson Bay Water
10 - 45
0.56 – 2.52
1 – 4.5
0.1 – 0.45
Treatment Plant
Hunter Water
Lemon Tree
50 - 80
2.8 – 4.48
5 - 8
0.5 – 0.8
ABN 46 228513 466
Passage Water
Customer enquiries: 1300 657 657
Treatment Plant
.au
Gresford Water
50 - 105
2.8 – 5.88
5 – 10.5
0.5 – 1.05
enquiries@.au
Treatment Plant
HUNTER WATER
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