Charlestown Water Hardness & Quality Report (2026)
Water Hardness
~0–59 mg/L
Softestimated · not lab-verified
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
63.9 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 Charlestown, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Charlestown | 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 Charlestown compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Charlestown, New South Wales | ≈ 0–59 mg/L | 🟢 Soft | reservoir |
| New Lambton, New South Wales | ≈ 0–60 mg/L | 🟢 Soft | reservoir |
| Merewether, New South Wales | ≈ 0–60 mg/L | 🟢 Soft | reservoir |
| Wallsend, New South Wales | ≈ 0–60 mg/L | 🟢 Soft | reservoir |
| Newcastle, New South Wales | ≈ 0–60 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Charlestown compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Charlestown | ≈ 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 Charlestown's Water Unique?
Local geology and source profile
Residents of Charlestown, NSW, receive their water supply from Hunter Water, which operates the Grahamstown treatment plant. This facility draws from a mixed water source, utilizing both surface water from reservoirs and groundwater aquifers. The Hunter catchment area provides the raw water, which is then treated before distribution to the community. The utility aims to provide a consistent and safe supply to the region it serves.
The water's journey begins in the Sydney Basin, a geological province characterized by Carboniferous and Permian sedimentary rocks. These formations include coal measures and related strata, which typically result in water that is soft to only slightly mineralized. The interaction of surface and groundwater with these relatively young sedimentary deposits defines the water's chemical makeup. Charlestown's water is considered soft, aligning with the general characteristics of water supplies across the Sydney region.
Because the water is soft, homeowners typically won't face significant issues with scale buildup in appliances like kettles or water heaters. You might notice subtle taste differences, which many find can be improved by chilling the water or using a simple carbon filter. Given its softness, installing a water softener isn't generally recommended, as it's already gentle on your plumbing and household devices. Charlestown water scored an excellent 9.5/10 in a recent assessment, with all tested parameters meeting the Australian Drinking Water Guidelines.
Geology & Source: Sydney Basin sedimentary rocks; coal measures and associated strata yield soft to slightly mineralised water
Other New South Wales Water Reports
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