South Penrith Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
125.6 mg/L
Est. Daily Cost
A$0.22
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 South Penrith, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In South Penrith | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How South Penrith compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ South Penrith, New South Wales | 69 mg/L | 🟡 Moderately Hard | reservoir |
| Kingswood Park, New South Wales | 58.5 mg/L | 🟢 Soft | reservoir |
| Penrith, New South Wales | 167.5 mg/L | 🟠 Hard | reservoir |
| Glenmore Park, New South Wales | 91 mg/L | 🟡 Moderately Hard | reservoir |
| Cranebrook, New South Wales | 150 mg/L | 🟠 Hard | reservoir |
National Benchmark
How South Penrith compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ South Penrith | 69 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes South Penrith's Water Unique?
Local geology and source profile
South Penrith's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant with a slightly elevated Hawkesbury-Nepean component for the Penrith City LGA outer western Sydney distribution in New South Wales. Water hardness in South Penrith is measured at 69 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. South Penrith — a residential suburb in the outer western Sydney Penrith City LGA adjacent to the Nepean River, known for the Penrith Stadium (BlueBet Stadium) precinct and the Greater Western Sydney rugby league community, the Peachtree Creek and South Penrith residential estates, and the outer western Sydney Blue Mountains foothills gateway residential community adjacent to the Nepean River floodplain — receives slightly elevated supply at the outer western Penrith Prospect distribution sub-zone.
South Penrith's slightly elevated hardness reflects a marginally higher Hawkesbury-Nepean component in the outer western Penrith Prospect distribution blend compared to the softer Kingswood Park sub-zone (58.5 mg/L) in the same Penrith LGA. The Hawkesbury-Nepean system's proximity contributes moderate dissolved calcium from Triassic carbonate-cemented Hawkesbury Sandstone alluvial deposits at the Nepean River corridor. The South Penrith outer western Penrith distribution at 69 mg/L and TDS 125.6 mg/L is still considerably soft by metropolitan standards, reflecting the predominantly Warragamba-dominant character of the outer western Sydney supply corridor.
South Penrith residents can expect occasional light limescale on taps and in kettles — descaling every two to three months is typically adequate. Hot water systems benefit from periodic inspection. The low lead reading (0.002 mg/L) is excellent. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. South Penrith's Nepean River community and the Penrith Stadium precinct benefit from this clean supply meeting all ADWG standards.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant with a slightly elevated Hawkesbury-Nepean component — the South Penrith Penrith outer western Sydney supply carries slightly hard water at 69 mg/L with TDS of 125.6 mg/L, slightly harder than the Kingswood Park sub-zone (58.5 mg/L) in the same Penrith LGA, reflecting a marginally higher Hawkesbury-Nepean proportion in the South Penrith outer western distribution sub-zone.