Croydon 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
43.5 mg/L
Est. Daily Cost
A$0.08
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 Croydon, your appliances are currently losing 3% efficiency due to mineral buildup.
| Appliance | In Croydon | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.8 yrs | 8.5 yrs | — |
| Washing Machine | 12.7 yrs | 12 yrs | — |
| Water Heater | 14.6 yrs | 15 yrs | -3% |
Regional Water Comparison
How Croydon compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Croydon, Victoria | 25 mg/L | 🟢 Soft | reservoir |
| Kilsyth, Victoria | 108 mg/L | 🟡 Moderately Hard | reservoir |
| Ringwood East, Victoria | 14.5 mg/L | 🟢 Soft | reservoir |
| Mooroolbark, Victoria | 25.5 mg/L | 🟢 Soft | reservoir |
| Bayswater, Victoria | 93.5 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Croydon compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Croydon | 25 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Croydon's Water Unique?
Local geology and source profile
Croydon's drinking water is supplied by Yarra Valley Water as water retailer, with bulk supply from Melbourne Water drawn from the Maroondah Reservoir and Upper Yarra Reservoir catchments in the Yarra Ranges, Victoria. Water hardness in Croydon is measured at 25 mg/L — classified as very soft — far below the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Croydon, in the Maroondah LGA at the base of the Dandenong Ranges foothills, sits directly adjacent to Melbourne Water's Maroondah Reservoir system and benefits from near-source supply with negligible pipeline mineral accumulation.
Croydon's very soft supply stems from its proximity to Melbourne Water's Maroondah Reservoir catchment. The Watts River and Dom Dom Creek systems feeding Maroondah drain through pristine Devonian granite and metamorphic rhyodacite of the Yarra Ranges — the same ancient igneous terrain contributing to Melbourne's characteristically soft supply. Croydon's location at the eastern urban fringe, almost in the shadow of the Maroondah catchment fences, means water reaches the Croydon tap with minimal pipeline travel distance and negligible additional mineral loading beyond the source reservoir hardness.
Croydon residents enjoy very low limescale accumulation on tap fittings, in kettles, and around shower fittings — descaling is an occasional rather than regular task. Hot water systems accumulate minimal scale throughout their service life. Yarra Valley Water provides water quality information at yvw.com.au, with all ADWG health standards consistently met. A benchtop carbon filter is popular among residents who prefer improved taste from the already soft supply, particularly after heavy autumn and winter rainfall events in the Maroondah Ranges catchment area adjacent to the Croydon residential community.
Geology & Source: Supplied by Yarra Valley Water (water retailer) and Melbourne Water (wholesale) from the Maroondah Reservoir and Upper Yarra catchment systems — the Croydon Maroondah outer east Melbourne supply carries very soft water at 25 mg/L, reflecting the near-source eastern Yarra Ranges reservoir supply delivered directly to the Croydon foothills community.