Thornbury 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
56.3 mg/L
Est. Daily Cost
A$0.10
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 Thornbury, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Thornbury | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.6 yrs | 8.5 yrs | — |
| Washing Machine | 12.4 yrs | 12 yrs | — |
| Water Heater | 14.3 yrs | 15 yrs | -5% |
Regional Water Comparison
How Thornbury compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Thornbury, Victoria | 31.5 mg/L | 🟢 Soft | reservoir |
| Northcote, Victoria | 52.5 mg/L | 🟢 Soft | reservoir |
| Preston, Victoria | 58.5 mg/L | 🟢 Soft | reservoir |
| Brunswick East, Victoria | 82.5 mg/L | 🟡 Moderately Hard | reservoir |
| Ivanhoe, Victoria | 66 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Thornbury compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Thornbury | 31.5 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Thornbury's Water Unique?
Local geology and source profile
Thornbury's drinking water is supplied by Yarra Valley 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 Thornbury is measured at 31.5 mg/L — classified as soft — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Thornbury, in the Darebin LGA — a vibrant inner northern Melbourne suburb known for its café and music venue culture along High Street and the iconic Thornbury Theatre — receives predominantly soft Yarra Ranges reservoir supply, similar to adjacent Northcote (52.5 mg/L) in the same Darebin LGA but noticeably softer, confirming sub-zone variation within the inner northern Darebin distribution network.
Thornbury's soft supply reflects the predominant direct Thomson and Upper Yarra reservoir supply at this inner northern Darebin distribution sub-zone, with minimal Winneke Water Treatment Plant contribution. The Thomson and Upper Yarra storages drain across Devonian granite and rhyodacite — the most chemically resistant formations in Melbourne's catchment region — contributing negligible dissolved minerals. The Thornbury distribution node at 31.5 mg/L receives a proportionally higher direct reservoir supply fraction than the adjacent Northcote and Preston sub-zones, reflecting the fine variation in supply blend composition across Darebin's inner northern distribution network.
Thornbury residents enjoy low limescale accumulation on taps, in kettles, and around shower fittings — descaling is an occasional rather than regular maintenance task. Hot water systems accumulate minimal scale. Yarra Valley Water provides water quality information at yvw.com.au, with all ADWG health standards consistently met. The soft supply benefits Thornbury's thriving hospitality precinct, ideal for the specialty coffee and craft brewing culture that defines the suburb's progressive inner-north Melbourne identity.
Geology & Source: Supplied by Yarra Valley Water (water retailer) and Melbourne Water (wholesale) from the Thomson Reservoir and Upper Yarra catchment systems — the Thornbury Darebin inner north Melbourne supply carries soft water at 31.5 mg/L, reflecting a predominantly direct Yarra Ranges reservoir supply distribution sub-zone in the inner northern Darebin LGA corridor.