Woy Woy Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
321.2 mg/L
Est. Daily Cost
A$0.47
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 Woy Woy, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Woy Woy | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 8.1 yrs | 12 yrs | -33% |
| Water Heater | 9.7 yrs | 15 yrs | -35% |
Regional Water Comparison
How Woy Woy compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Woy Woy, New South Wales | 148 mg/L | 🟠 Hard | reservoir |
| Umina Beach, New South Wales | 33 mg/L | 🟢 Soft | reservoir |
| Central Coast, New South Wales | 55 mg/L | 🟢 Soft | reservoir |
| Terrigal, New South Wales | 77.5 mg/L | 🟡 Moderately Hard | reservoir |
| Bateau Bay, New South Wales | 30 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Woy Woy compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Woy Woy | 148 mg/L | 🟠 Moderate |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Woy Woy's Water Unique?
Local geology and source profile
Woy Woy's drinking water is supplied by Central Coast Council, drawing from the Mardi-Mangrove Transfer System and Mangrove Creek Dam for the Central Coast LGA Woy Woy Peninsula distribution in New South Wales. Water hardness in Woy Woy is measured at 148 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Woy Woy — a heritage commuter township on the Woy Woy Peninsula at the southern end of Brisbane Water on the NSW Central Coast, known as the tightly-knit community celebrated in The Wiggles' Greg Page's hometown, the Woy Woy Channel foreshore and the Pearl Beach and Patonga access hub, and the popular Central Coast rail commuter community with the Woy Woy railway interchange — receives moderately hard supply substantially harder than other Central Coast sub-zones, reflecting a different supply blend at the Woy Woy Peninsula distribution.
Woy Woy's elevated hardness reflects a more mineralised supply blend at the Woy Woy Peninsula Central Coast distribution sub-zone. While the primary Mangrove Creek Dam and Mardi-Mangrove Transfer System supply drains predominantly Narrabeen Group sandstone terrain — typically very soft — the Woy Woy Peninsula distribution sub-zone receives a different pipeline routing compared to the softer Terrigal (77.5 mg/L) and Bateau Bay (30 mg/L) sub-zones. The higher hardness at 148 mg/L and TDS 321.2 mg/L likely reflects a different supply blend proportion or local Brisbane Water groundwater supplementation at the Woy Woy Peninsula sub-zone contributing elevated mineralisation.
Woy Woy residents can expect moderate limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from regular inspection. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. Central Coast Council provides water quality information at centralcoast.nsw.gov.au, with all ADWG health standards consistently met. Woy Woy's Brisbane Water foreshore community and the Woy Woy Peninsula railway corridor benefit from supply meeting all ADWG safe drinking standards.
Geology & Source: Supplied by Central Coast Council from the Mardi-Mangrove Transfer System and Mangrove Creek Dam — the Woy Woy Peninsula Central Coast supply carries moderately hard water at 148 mg/L with TDS of 321.2 mg/L, substantially harder than the Terrigal (77.5 mg/L) and Bateau Bay (30 mg/L) Central Coast sub-zones, reflecting a different supply blend with elevated mineralisation at the Woy Woy Peninsula Brisbane Water distribution sub-zone.