Horsham Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
134.9 mg/L
Est. Daily Cost
A$0.21
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 9% efficiency due to mineral buildup.
| Appliance | In Horsham | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 11.1 yrs | 12 yrs | -8% |
| Water Heater | 12.9 yrs | 15 yrs | -14% |
Regional Water Comparison
How Horsham compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Horsham, Victoria | 66.5 mg/L | 🟡 Moderately Hard | reservoir |
| Hamilton, Victoria | 109.5 mg/L | 🟡 Moderately Hard | reservoir |
| Warrnambool, Victoria | 45.5 mg/L | 🟢 Soft | reservoir |
| Mount Gambier, South Australia | 250 mg/L | 🔴 Very Hard | groundwater |
| Wendouree, Victoria | 28.5 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Horsham compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Horsham | 66.5 mg/L | 🟡 Low |
| 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
Horsham's drinking water is supplied by GWMWater (Grampians Wimmera Mallee Water), drawing from the Grampians reservoir system — including Lake Bellfield (Fyans Creek) and Lake Fyans (Fyans Valley) — in the Grampians National Park, with transfer to the Wimmera-Mallee Pipeline network serving the regional city of Horsham in Victoria. Water hardness in Horsham is measured at 66.5 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Horsham — the commercial capital of the Wimmera agricultural region in western Victoria, known for the Wimmera River parkland precinct, the Natimuk Climbing Festival, and the grain belt farming landscape — benefits from the Grampians mountain catchment supply delivering comparatively moderate hardness to this regional agricultural centre.
Horsham's slightly elevated hardness reflects the Grampians Group sandstone and Cambrian–Devonian Mt William granite geology of the Grampians National Park catchments. Lake Bellfield and Lake Fyans collect rainfall from the Grampians highlands — where ancient Cambrian–Silurian siliciclastic sandstones (Grampians Group) and Devonian granite intrusives provide moderate calcium and silica dissolution — contributing a gently mineralised regional supply compared to the very soft eastern Victorian alpine granite supplies. The Horsham 66.5 mg/L and TDS 134.9 mg/L is consistent with this modest western Victoria Grampians catchment mineral character.
Horsham residents can expect occasional moderate limescale on taps and in kettles — descaling every two to three months is adequate. Hot water systems benefit from periodic inspection. The elevated lead reading (0.003 mg/L) warrants briefly running the cold tap before use. GWMWater provides water quality information online, with all ADWG health standards consistently met. The relatively soft Grampians reservoir supply is an important resource for Horsham's irrigation and dryland farming community in the Wimmera agricultural region.
Geology & Source: Supplied by GWMWater (Grampians Wimmera Mallee Water) from the Grampians reservoir system including Lake Bellfield and Lake Fyans in the Grampians National Park — the Horsham Wimmera regional supply carries slightly hard water at 66.5 mg/L, reflecting the Cambrian–Devonian granite and Grampians Group sandstone terrain of the Grampians highlands that produces the moderately mineralised Wimmera regional supply.