Killara 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
102.6 mg/L
Est. Daily Cost
A$0.18
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 Killara, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Killara | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.7 yrs | 8.5 yrs | -9% |
| Washing Machine | 11.5 yrs | 12 yrs | -4% |
| Water Heater | 13.3 yrs | 15 yrs | -11% |
Regional Water Comparison
How Killara compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Killara, New South Wales | 58 mg/L | 🟢 Soft | reservoir |
| Pymble, New South Wales | 90 mg/L | 🟡 Moderately Hard | reservoir |
| Saint Ives, New South Wales | 152 mg/L | 🟠 Hard | reservoir |
| Lane Cove North, New South Wales | 181 mg/L | 🔴 Very Hard | reservoir |
| Chatswood, New South Wales | 179.5 mg/L | 🟠 Hard | reservoir |
National Benchmark
How Killara compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Killara | 58 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Killara's Water Unique?
Local geology and source profile
Killara's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant drawing predominantly from Warragamba Dam (Nepean River system) for the Ku-ring-gai LGA upper north shore Sydney distribution in New South Wales. Water hardness in Killara is measured at 58 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Killara — a prestigious heritage residential suburb on the upper north shore of Sydney in the Ku-ring-gai LGA, adjacent to Gordon and Lindfield on the North Shore railway line, known for the Killara Golf Club, the Ku-ring-gai bush regeneration corridors of the Lane Cove National Park, the Killara Park, and the well-established heritage upper north shore residential community — receives slightly elevated supply at the Ku-ring-gai upper north shore Prospect distribution sub-zone.
Killara's slightly elevated hardness reflects a minor Hawkesbury-Nepean component in the Ku-ring-gai upper north shore Prospect distribution blend. Warragamba Dam collects rainfall from the Blue Mountains sandstone plateau and Kanangra–Boyd granite uplands — chemically resistant terrain contributing negligible dissolved minerals — producing predominantly soft supply. The slight elevation from the base Warragamba soft character at Killara (58 mg/L, TDS 102.6 mg/L) reflects minimal Hawkesbury-Nepean supplementation at this upper north shore distribution sub-zone, considerably softer than the harder lower north shore North Sydney LGA sub-zones (Neutral Bay 183 mg/L, Cremorne 183 mg/L).
Killara residents can expect minimal to occasional light limescale on taps and in kettles — descaling every two to three months is typically sufficient. Hot water systems accumulate minimal scale. The very 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. Killara's prestigious upper north shore Ku-ring-gai residential community benefits from a safe supply meeting all ADWG standards.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant drawing predominantly from Warragamba Dam — the Killara Ku-ring-gai upper north shore Sydney supply carries slightly hard water at 58 mg/L with low TDS of 102.6 mg/L, reflecting a predominantly Warragamba-dominant supply with minimal Hawkesbury-Nepean component at the upper north shore Ku-ring-gai LGA Killara Prospect distribution sub-zone.