Coogee Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.6
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
217.7 mg/L
Est. Daily Cost
A$0.35
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 Coogee, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Coogee | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6 yrs | 8.5 yrs | -29% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 11.2 yrs | 15 yrs | -25% |
Regional Water Comparison
How Coogee compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Coogee, New South Wales | 109 mg/L | 🟡 Moderately Hard | reservoir |
| Randwick, New South Wales | 31.5 mg/L | 🟢 Soft | reservoir |
| Kingsford, New South Wales | 83.5 mg/L | 🟡 Moderately Hard | reservoir |
| Kensington, New South Wales | 195 mg/L | 🔴 Very Hard | reservoir |
| Maroubra, New South Wales | 169 mg/L | 🟠 Hard | reservoir |
National Benchmark
How Coogee compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coogee | 109 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
Bring Boronia-quality water to your Coogee home
Shop water softeners on Amazon.com →
What Makes Coogee's Water Unique?
Local geology and source profile
Coogee's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant blending Warragamba Dam with a significant Hawkesbury-Nepean component for the Randwick LGA eastern coastal Sydney distribution in New South Wales. Water hardness in Coogee is measured at 109 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Coogee — one of Sydney's most popular eastern suburbs coastal beach precincts, known for Coogee Beach, the Coogee RSL, the seaside Arden Street residential cliffs, and the vibrant Coogee village café and hotel strip — receives supply harder than adjacent Kingsford (83.5 mg/L) in the same Randwick LGA, reflecting a higher Hawkesbury-Nepean proportion at this eastern coastal Randwick distribution sub-zone.
Coogee's elevated hardness reflects the proportionally significant Hawkesbury-Nepean component in the eastern coastal Randwick Prospect distribution sub-zone. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented sedimentary formations — dissolving substantial calcium bicarbonate. The Coogee coastal Randwick distribution sub-zone at 109 mg/L and TDS 217.7 mg/L receives a higher Hawkesbury-Nepean fraction than the inland Kingsford sub-zone, confirming the within-LGA supply blend variation across the eastern Sydney Randwick distribution network.
Coogee residents face moderate limescale build-up on taps, shower screens, and in kettles — descaling every two to three months is typically adequate. Hot water systems benefit from periodic inspection. The elevated lead reading (0.003 mg/L) warrants briefly running the cold tap before use in older Coogee beachside properties. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met. Coogee's beach tourism precinct and the thriving café and hotel strip along Coogee Bay Road benefit from water quality meeting all ADWG safe drinking standards.
Geology & Source: Supplied by Sydney Water via the Prospect Water Filtration Plant blending Warragamba Dam with a significant Hawkesbury-Nepean component — the Coogee Randwick LGA eastern coastal supply carries moderately hard water at 109 mg/L, notably harder than adjacent Kingsford (83.5 mg/L) in the same Randwick LGA, reflecting a higher Hawkesbury-Nepean proportion at the coastal Randwick eastern Sydney distribution sub-zone.