Mornington Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.1
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
36 mg/L
Est. Daily Cost
A$0.07
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 Mornington, your appliances are currently losing 3% efficiency due to mineral buildup.
| Appliance | In Mornington | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.9 yrs | 8.5 yrs | — |
| Washing Machine | 12.8 yrs | 12 yrs | — |
| Water Heater | 14.8 yrs | 15 yrs | -1% |
Regional Water Comparison
How Mornington compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Mornington, Victoria | 21 mg/L | 🟢 Soft | reservoir |
| Mount Martha, Victoria | 7.5 mg/L | 🟢 Soft | reservoir |
| Mount Eliza, Victoria | 11.5 mg/L | 🟢 Soft | reservoir |
| Frankston South, Victoria | 18 mg/L | 🟢 Soft | reservoir |
| Frankston, Victoria | 89 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Mornington compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mornington | 21 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Mornington's Water Unique?
Local geology and source profile
Mornington'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 Mornington is measured at 21 mg/L — classified as very soft — far below the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Mornington, the historic gateway township of the Mornington Peninsula in the Mornington Peninsula Shire, receives Melbourne Water's Yarra Ranges supply via the south-east coastal peninsula distribution pipeline, with hardness among the lowest in the greater Melbourne metropolitan supply network.
Mornington's very soft supply traces to Melbourne Water's pristine Yarra Ranges catchments. The Thomson and Upper Yarra storages collect water draining across Devonian granite and metamorphic rhyodacite — ancient igneous formations contributing negligible dissolved minerals. The south-eastern coastal pipeline corridor delivering supply to the Mornington Peninsula communities maintains low mineral content along the route, suggesting either a near-source supply connection or a distribution pathway with minimal additional mineral pickup, consistently delivering 21 mg/L to the Mornington residential and commercial areas.
Mornington 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 a popular choice for households who prefer further improved taste from the already soft Mornington Peninsula supply, which is well regarded among the region's residential and holiday communities.
Geology & Source: Supplied by South East Water (water retailer) and Melbourne Water (wholesale) from the Thomson Reservoir and Upper Yarra catchment systems — the Mornington Mornington Peninsula supply carries very soft water at 21 mg/L, reflecting the near-source eastern Yarra Ranges reservoir supply delivered to the Mornington Peninsula gateway via the south-east coastal pipeline corridor.