Cranbourne North Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.1
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
29.5 mg/L
Est. Daily Cost
A$0.06
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 North, your appliances are currently losing 2% efficiency due to mineral buildup.
| Appliance | In Cranbourne North | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 9 yrs | 8.5 yrs | — |
| Washing Machine | 13 yrs | 12 yrs | — |
| Water Heater | 14.9 yrs | 15 yrs | -1% |
Regional Water Comparison
How Cranbourne North compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Cranbourne North, Victoria | 17.5 mg/L | 🟢 Soft | reservoir |
| Narre Warren South, Victoria | 17.5 mg/L | 🟢 Soft | reservoir |
| Cranbourne West, Victoria | 17.5 mg/L | 🟢 Soft | reservoir |
| Cranbourne East, Victoria | 17.5 mg/L | 🟢 Soft | reservoir |
| Cranbourne, Victoria | 34.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Cranbourne North compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Cranbourne North | 17.5 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Cranbourne North's Water Unique?
Local geology and source profile
Cranbourne North'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 North is measured at 17.5 mg/L — classified as very soft — far below the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Cranbourne North, in the Casey LGA of Melbourne's outer south-east growth corridor, receives Melbourne Water's Yarra Ranges supply at near-source softness, with hardness identical to adjacent Cranbourne East and Narre Warren South, confirming a shared eastern outer suburban supply corridor.
Cranbourne North's very soft supply reflects Melbourne Water's protected Yarra Ranges catchments. The Thomson and Upper Yarra storages collect runoff draining across Devonian granite and metamorphic rhyodacite — ancient igneous formations contributing virtually no dissolved minerals. The eastern Casey supply corridor, stretching from Pakenham (5.5 mg/L) through Narre Warren South (17.5 mg/L), Cranbourne North (17.5 mg/L), and Cranbourne East (17.5 mg/L), consistently delivers near-source soft water from the Yarra Ranges with minimal pipeline mineral pickup, confirming a direct and efficient supply pathway from the highland reservoir system.
Cranbourne North residents enjoy very low limescale accumulation on tap fittings, in kettles, and around shower fittings — descaling is an occasional rather than routine task. 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. A benchtop carbon filter is popular for improved taste among residents who find the ultra-soft, low-TDS supply slightly flat, and the soft water is an everyday benefit for the many new homes and young families of the Casey outer south-eastern growth community.
Geology & Source: Supplied by South East Water (water retailer) and Melbourne Water (wholesale) from the Thomson Reservoir and Upper Yarra Reservoir catchments in the Yarra Ranges — the Cranbourne North Casey outer south-east supply carries very soft water at 17.5 mg/L, identical to adjacent Cranbourne East and Narre Warren South, reflecting the near-source eastern Yarra Ranges supply corridor serving the outer Casey communities.