Umina Beach Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
54.8 mg/L
Est. Daily Cost
A$0.10
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 Umina Beach, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Umina Beach | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.4 yrs | 12 yrs | — |
| Water Heater | 14.3 yrs | 15 yrs | -5% |
Regional Water Comparison
How Umina Beach compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Umina Beach, New South Wales | 33 mg/L | 🟢 Soft | reservoir |
| Woy Woy, New South Wales | 148 mg/L | 🟠 Hard | reservoir |
| Central Coast, New South Wales | 55 mg/L | 🟢 Soft | reservoir |
| Pittwater, New South Wales | 107.5 mg/L | 🟡 Moderately Hard | reservoir |
| Terrigal, New South Wales | 77.5 mg/L | 🟡 Moderately Hard | reservoir |
National Benchmark
How Umina Beach compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Umina Beach | 33 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Umina Beach's Water Unique?
Local geology and source profile
Umina Beach's drinking water is supplied by Central Coast Council Water, drawing from Mangrove Creek Dam and the Mardi Dam system on the Wyong River catchment network for the Central Coast LGA Woy Woy Peninsula distribution in New South Wales. Water hardness in Umina Beach is measured at 33 mg/L — classified as soft — well within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Umina Beach — a popular holiday and residential suburb on the sheltered western shore of the Woy Woy Peninsula, overlooking Brisbane Water, with the Ocean Beach surf beach on the eastern ocean side — benefits from a soft supply characteristic of the Central Coast water supply system, drawing from catchments in the forested sandstone and granite terrain of the Central Coast hinterland.
Umina Beach's soft supply reflects the Triassic Hawkesbury Sandstone and Permian–Triassic granite geology of the Central Coast catchments. The Mangrove Creek and Mardi Creek systems collect rainfall from the Central Coast Range — dense forested escarpment and plateau terrain of Hawkesbury Sandstone overlying Triassic and Permian basement granite and arenite — where tight siliceous formation provides minimal mineral dissolution, producing the characteristically soft low-mineral Central Coast supply. The Umina Beach Woy Woy Peninsula distribution sub-zone at 33 mg/L and TDS 54.8 mg/L confirms the clean, soft supply characteristic of this coastal catchment system.
Umina Beach residents enjoy very 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 very low lead reading (0.001 mg/L) confirms excellent supply quality. Central Coast Council provides water quality information online, with all ADWG health standards consistently met. The soft supply benefits Umina Beach's popular holiday residential community on Brisbane Water's scenic Woy Woy Peninsula foreshore.
Geology & Source: Supplied by Central Coast Council Water from Mangrove Creek Dam and the Mardi Dam system on the Mardi Creek (Wyong River catchment) — the Umina Beach Central Coast supply carries soft water at 33 mg/L with low TDS of 54.8 mg/L, characteristic of the Triassic Hawkesbury Sandstone and basement granite terrain of the Central Coast catchments that produces the soft surface supply for the Woy Woy Peninsula community.