Corio Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
83.5 mg/L
Est. Daily Cost
A$0.14
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 Corio, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Corio | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.1 yrs | 8.5 yrs | -5% |
| Washing Machine | 12 yrs | 12 yrs | — |
| Water Heater | 13.8 yrs | 15 yrs | -8% |
Regional Water Comparison
How Corio compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Corio, Victoria | 44.5 mg/L | 🟢 Soft | reservoir |
| Lara, Victoria | 70 mg/L | 🟡 Moderately Hard | reservoir |
| Geelong, Victoria | 25 mg/L | 🟢 Soft | reservoir |
| Belmont, Victoria | 80 mg/L | 🟡 Moderately Hard | reservoir |
| Highton, Victoria | 102 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Corio compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Corio | 44.5 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Corio's Water Unique?
Local geology and source profile
Corio's drinking water is supplied by Barwon Water, incorporating supply from the Moorabool River and Lal Lal Reservoir system for the City of Greater Geelong LGA northern Corio Bay coastal distribution in Victoria. Water hardness in Corio is measured at 44.5 mg/L — classified as soft — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Corio, in the Greater Geelong LGA — an established northern Geelong suburb of workers' homes and community infrastructure at Corio Bay, adjacent to the Lara growth corridor and the Norlane industrial precinct — receives supply notably softer than the Barwon River-dominant Highton sub-zone (102 mg/L) in the same Greater Geelong LGA, confirming significant sub-zone supply blend variation across Barwon Water's northern Geelong distribution network.
Corio's softer supply reflects a distribution sub-zone incorporating a proportionally higher Moorabool River and Lal Lal Reservoir supply component compared to the Barwon River dominant zones of central Geelong. The Lal Lal Reservoir and Moorabool River system drain across Devonian granite and You Yangs granodiorite terrain west and north of Geelong — producing softer, lower-mineral water than the Barwon River's traverse through Devonian basalt plains. The Corio northern Geelong distribution node at 44.5 mg/L and TDS 83.5 mg/L benefits from the softer Moorabool/Lal Lal supply fraction proportionally higher at this northern coastal distribution sub-zone.
Corio residents enjoy low limescale accumulation on taps, in kettles, and around shower fittings — descaling every two to three months is typically adequate. Hot water systems accumulate minimal scale. The low lead reading (0.002 mg/L) is reassuring. Barwon Water provides water quality information at barwonwater.com.au, with all ADWG health standards consistently met. The soft supply is a practical benefit for Corio's working residential community in northern Geelong's Corio Bay coastal precinct.
Geology & Source: Supplied by Barwon Water incorporating Moorabool River and Lal Lal Reservoir supply at the northern Geelong Corio coastal distribution — the Corio Greater Geelong northern coastal supply carries soft water at 44.5 mg/L, notably softer than the Barwon River dominant Highton sub-zone (102 mg/L) in the same Greater Geelong LGA, reflecting a higher Moorabool/Lal Lal supply proportion at the northern Corio coastal corridor.