Rosebud Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
254.9 mg/L
Est. Daily Cost
A$0.35
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 Rosebud, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Rosebud | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6 yrs | 8.5 yrs | -29% |
| Washing Machine | 9.5 yrs | 12 yrs | -21% |
| Water Heater | 11.2 yrs | 15 yrs | -25% |
Regional Water Comparison
How Rosebud compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Rosebud, Victoria | 109.5 mg/L | 🟡 Moderately Hard | reservoir |
| Mount Martha, Victoria | 7.5 mg/L | 🟢 Soft | reservoir |
| Mornington, Victoria | 21 mg/L | 🟢 Soft | reservoir |
| Mount Eliza, Victoria | 11.5 mg/L | 🟢 Soft | reservoir |
| Somerville, Victoria | 20.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Rosebud compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rosebud | 109.5 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Rosebud's Water Unique?
Local geology and source profile
Rosebud's drinking water is supplied by South East Water as water retailer, with bulk supply from Melbourne Water incorporating Cardinia Reservoir supply distributed through the Mornington Peninsula supply network for the Mornington Peninsula Shire LGA outer southern distribution in Victoria. Water hardness in Rosebud is measured at 109.5 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Rosebud — a popular Mornington Peninsula holiday and retirement coastal community at the heart of the southern Rye–Rosebud–Dromana strip on Port Phillip Bay, known for the Rosebud foreshore recreational parklands, the Mornington Peninsula Freeway gateway, and the coastal café and retail precinct — receives moderately elevated supply reflecting the supply blend characteristics at the outer southern Mornington Peninsula distribution.
Rosebud's moderately elevated hardness reflects the supply blend at the outer southern Mornington Peninsula distribution, drawing from Cardinia Reservoir (Cardinia Creek, Dandenong Ranges granite and sedimentary catchment) and possibly supplementary local groundwater from Mornington Peninsula aquifers in the Quaternary coastal plain and Tertiary limestone formations. South East Water's outer southern Mornington Peninsula distribution at 109.5 mg/L and TDS 254.9 mg/L is moderately elevated, harder than central inner Melbourne sub-zones receiving predominantly Yarra Ranges direct supply.
Rosebud residents face moderate limescale build-up on taps and in kettles — descaling every two to three months is typically adequate. Hot water systems benefit from periodic inspection. The elevated lead reading (0.005 mg/L) warrants briefly running the cold tap before use in older Rosebud holiday homes and retirement properties. South East Water provides water quality information at southeastwater.com.au, with all ADWG health standards consistently met. Rosebud's holiday coastal community and retail precinct benefit from a reliable supply meeting all ADWG standards.
Geology & Source: Supplied by South East Water (water retailer) and Melbourne Water (wholesale) incorporating Cardinia Reservoir supply and Mornington Peninsula distribution infrastructure — the Rosebud Mornington Peninsula outer southern supply carries moderately hard water at 109.5 mg/L with elevated TDS of 254.9 mg/L, reflecting the supply blend at the outer southern Mornington Peninsula distribution sub-zone.