Cranbourne Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
62.3 mg/L
Est. Daily Cost
A$0.11
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 Cranbourne, your appliances are currently losing 5% efficiency due to mineral buildup.
| Appliance | In Cranbourne | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.3 yrs | 12 yrs | — |
| Water Heater | 14.2 yrs | 15 yrs | -5% |
Regional Water Comparison
How Cranbourne compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Cranbourne, Victoria | 34.5 mg/L | 🟢 Soft | reservoir |
| Cranbourne East, Victoria | 17.5 mg/L | 🟢 Soft | reservoir |
| Cranbourne West, Victoria | 17.5 mg/L | 🟢 Soft | reservoir |
| Cranbourne North, Victoria | 17.5 mg/L | 🟢 Soft | reservoir |
| Clyde, Victoria | 87 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Cranbourne compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Cranbourne | 34.5 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Cranbourne's Water Unique?
Local geology and source profile
Cranbourne's drinking water is supplied by South East Water as water retailer, with bulk supply from Melbourne Water drawn from the Thomson Reservoir and Upper Yarra Reservoir catchments in the Yarra Ranges, Victoria. Water hardness in Cranbourne is measured at 34.5 mg/L — classified as soft — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Cranbourne, the major commercial hub of Melbourne's outer south-eastern Casey LGA and home to the world-famous Royal Botanic Gardens Cranbourne Australian Garden, receives a soft Yarra Ranges reservoir supply consistent with the broader Casey corridor — comparable to Cranbourne North (17.5 mg/L) and Cranbourne East (17.5 mg/L) in the same LGA, with the slightly higher 34.5 mg/L at the Cranbourne town centre reflecting minor distribution pathway differences.
Cranbourne's soft supply stems from Melbourne Water's protected Yarra Ranges catchments. The Thomson and Upper Yarra storages collect runoff across Devonian granite and rhyodacite — highly resistant igneous terrain contributing negligible dissolved minerals. The Cranbourne town centre distribution node receives predominantly direct Yarra Ranges reservoir supply, with minimal Winneke WTP proportion, reflecting the soft character of the broader outer south-eastern Casey LGA supply corridor that delivers very soft to soft water throughout the Melbourne growth frontier zone.
Cranbourne residents enjoy very low limescale accumulation on taps, in kettles, and around shower fittings — descaling is an occasional task rather than a regular requirement. Hot water systems accumulate minimal scale throughout their service life. South East Water provides water quality information at southeastwater.com.au, with all ADWG health standards consistently met. The soft supply benefits the diverse and rapidly growing Cranbourne community — one of Melbourne's busiest outer south-eastern residential growth areas — with minimal appliance scale concerns in new development properties.
Geology & Source: Supplied by South East Water (water retailer) and Melbourne Water (wholesale) from the Thomson Reservoir and Upper Yarra catchment systems — the Cranbourne Casey outer south-east Melbourne supply carries soft water at 34.5 mg/L, characteristic of the direct Yarra Ranges reservoir supply typical of the outer south-eastern Casey corridor, consistent with Cranbourne North (17.5 mg/L) and Cranbourne East (17.5 mg/L) sub-zones.