Karratha Water Hardness & Quality Report (2026)
Water Hardness
~0–59 mg/L
Softestimated · not lab-verified
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
96.4 mg/L
Est. Daily Cost
A$0.10
energy & soap waste
Source: BOM National Performance Report & ADWG · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Karratha, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Karratha | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.2 yrs | 8.5 yrs | -4% |
| Washing Machine | 11.5 yrs | 12 yrs | -4% |
| Water Heater | 14.4 yrs | 15 yrs | -4% |
Regional Water Comparison
How Karratha compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Karratha, Western Australia | ≈ 0–59 mg/L | 🟢 Soft | mixed |
| South Hedland, Western Australia | ≈ 180+ mg/L | 🔴 Very Hard | mixed |
| Port Hedland, Western Australia | ≈ 180+ mg/L | 🔴 Very Hard | mixed |
| Newman, Western Australia | ≈ 180+ mg/L | 🔴 Very Hard | mixed |
| Broome, Western Australia | ≈ 120–179 mg/L | 🟠 Hard | mixed |
National Benchmark
How Karratha compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Karratha | ≈ 0–59 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Karratha's Water Unique?
Local geology and source profile
Water Corporation delivers drinking water to Karratha and nearby areas in Western Australia's Pilbara region, including the Karratha Industrial Estate. The main sources are groundwater drawn from the Cape Preston and Millstream aquifers. These aquifers are part of the Canning Basin, with water recharged by rainfall and occasional tropical cyclones. Water Corporation treats the water at local facilities, adhering to the Australian Drinking Water Guidelines. The vast service area spans about 13,943 square kilometers within the City of Karratha local government boundary.
The groundwater originates from Proterozoic sedimentary rock sequences, specifically the Wyloo Group and Hamersley Basin formations. These consist of iron-rich shales, banded iron formations, and some sandstones. Because these rocks are not rich in carbonates like limestone or dolomite, they dissolve very little calcium and magnesium. This geological characteristic is why Karratha's water is naturally soft, with low levels of dissolved minerals from the slow movement of water through fractured parts of the aquifers.
Because the water is soft, you'll find minimal limescale buildup in appliances like kettles and hot water systems, which helps protect your plumbing. You won't notice much impact on dishwashers or washing machines, and soap will lather easily without needing extra amounts. A water softener isn't recommended; if you're concerned about sediment, basic filtration is sufficient. The water's pH is 7.85, turbidity is 0.1 NTU, and total dissolved solids measure 157 mg/L, all well within the Australian Drinking Water Guidelines. Fluoride levels are low, at 0.1 mg/L.
Geology & Source: Pilbara Proterozoic sedimentary formations; minimal dissolution of calcium and magnesium-bearing minerals result in soft water
Other Western Australia Water Reports
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