Horsham Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
reservoir
pH Level
8.6
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
514.9 mg/L
Est. Daily Cost
A$1.08
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 Horsham, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Horsham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Horsham compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Horsham, Victoria | ≈ 180+ mg/L | 🔴 Very Hard | reservoir |
| Hamilton, Victoria | ≈ 60–120 mg/L | 🟡 Moderately Hard | reservoir |
| Warrnambool, Victoria | ≈ 0–60 mg/L | 🟢 Soft | reservoir |
| Mount Gambier, South Australia | ≈ 120–179 mg/L | 🟠 Hard | groundwater |
| Wendouree, Victoria | 28.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Horsham compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Horsham | ≈ 180+ mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Horsham's Water Unique?
Local geology and source profile
The Grampians Wimmera-Mallee (GWMWater) utility provides treated drinking water to Horsham and surrounding communities in Victoria's Wimmera region. This supply originates from the Grampians Headworks Storages, a system of reservoirs and diversion weirs within the Grampians ranges and Wimmera River catchment. Water is then treated at the Mt Zero Water Treatment Plant before being distributed to residents. GWMWater ensures the water meets the Australian Drinking Water Guidelines through regular testing conducted by NATA-accredited laboratories.
The source water is drawn from the Wimmera-Grampians catchment. Geologically, this area is characterized by Paleozoic sedimentary rocks belonging to the Grampians Group, along with Quaternary alluvium found near the Wimmera River. These rock types, which include sandstones and some limestone deposits, interact with surface water and shallow groundwater. This geological interaction naturally dissolves minerals like calcium and magnesium, giving the water its characteristic hardness, a common trait for surface supplies influenced by groundwater in southeastern Australia.
This very hard water can lead to noticeable scale buildup in appliances such as kettles, hot water systems, dishwashers, and washing machines, which can decrease their efficiency and shorten their lifespan. You might also find that you need to use more soap and detergent, and water spots can appear on glassware and fixtures. To manage these effects and prolong the life of your equipment, homeowners can regularly descale appliances using vinegar, install scale filters on frequently used appliances, or consider a whole-house water softener.
Geology & Source: Grampians Group sedimentary rocks (sandstones, siltstones, mudstones) and Devonian granitic intrusions; limestone-influenced soils and fractured bedrock yield high hardness.
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