Engadine 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
92.6 mg/L
Est. Daily Cost
A$0.17
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 Engadine, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Engadine | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.9 yrs | 8.5 yrs | -7% |
| Washing Machine | 11.6 yrs | 12 yrs | -3% |
| Water Heater | 13.5 yrs | 15 yrs | -10% |
Regional Water Comparison
How Engadine compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Engadine, New South Wales | 53 mg/L | 🟢 Soft | reservoir |
| Menai, New South Wales | 132.5 mg/L | 🟠 Hard | reservoir |
| Sutherland, New South Wales | 132 mg/L | 🟠 Hard | reservoir |
| Miranda, New South Wales | 88 mg/L | 🟡 Moderately Hard | reservoir |
| Sylvania, New South Wales | 51 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Engadine compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Engadine | 53 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
Bring Boronia-quality water to your Engadine home
Shop water softeners on Amazon.com →
What Makes Engadine's Water Unique?
Local geology and source profile
Engadine's drinking water is supplied by Sydney Water, incorporating supply from Woronora Dam on the Woronora River in the Sutherland Plateau and the broader Warragamba metropolitan grid for the Sutherland Shire LGA southern plateau distribution in New South Wales. Water hardness in Engadine is measured at 53 mg/L — classified as soft — well within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Engadine — an elevated southern Sydney suburb on the Sutherland Plateau, known for its bushland setting within Heathcote National Park and the Woronora River corridor — benefits from a soft supply characteristic of the Sutherland Plateau catchment, consistent with adjacent Cronulla (57.5 mg/L) in the same Sutherland Shire and typical of the southern Sydney soft supply zone.
Engadine's soft supply reflects the Triassic Hawkesbury Sandstone and basement granite geology of the Woronora River and Sutherland Plateau catchments. The Woronora Dam collects rainfall from the Royal National Park and Heathcote National Park area — ancient, deeply weathered sandstone and granite terrain where tight Triassic arenite and granite provide minimal mineral dissolution surface area — contributing a characteristically low-mineral soft supply. The Engadine Sutherland southern plateau distribution sub-zone at 53 mg/L and TDS 92.6 mg/L confirms the consistently soft supply character across the southern Sydney Sutherland Shire.
Engadine 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. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. The clean, soft supply is a natural complement to Engadine's distinctive bushland plateau residential setting within the Sutherland Shire national park corridor.
Geology & Source: Supplied by Sydney Water incorporating catchment supply from Woronora Dam on the Woronora River and the broader Warragamba grid — the Engadine Sutherland LGA southern plateau supply carries soft water at 53 mg/L, reflecting the Triassic Hawkesbury Sandstone and basement granite terrain of the Sutherland Plateau that produces the characteristic soft supply of the southern Sydney plateau distribution zone.