Terrigal Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
143.9 mg/L
Est. Daily Cost
A$0.25
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 Terrigal, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Terrigal | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.7 yrs | 12 yrs | -11% |
| Water Heater | 12.5 yrs | 15 yrs | -17% |
Regional Water Comparison
How Terrigal compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Terrigal, New South Wales | 77.5 mg/L | 🟡 Moderately Hard | reservoir |
| Bateau Bay, New South Wales | 30 mg/L | 🟢 Soft | reservoir |
| Central Coast, New South Wales | 55 mg/L | 🟢 Soft | reservoir |
| Woy Woy, New South Wales | 148 mg/L | 🟠 Hard | reservoir |
| Umina Beach, New South Wales | 33 mg/L | 🟢 Soft | reservoir |
National Benchmark
How Terrigal compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Terrigal | 77.5 mg/L | 🟡 Low |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Terrigal's Water Unique?
Local geology and source profile
Terrigal'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 coastal resort distribution in New South Wales. Water hardness in Terrigal is measured at 77.5 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Terrigal — a premier coastal resort and residential destination on the NSW Central Coast, known for the Terrigal Beach and surf pavilion, the Terrigal Haven and The Skillion headland walk, the Terrigal Lagoon café and restaurant precinct, the Crowne Plaza Terrigal Pacific Hotel, and the sought-after Central Coast coastal lifestyle of this nationally recognised NSW beach resort community — receives slightly elevated supply compared to the softer Bateau Bay sub-zone (30 mg/L) in the same Central Coast Council supply network.
Terrigal's slightly elevated hardness reflects greater mineralisation at the Terrigal coastal Central Coast distribution sub-zone. The Central Coast water supply from Mangrove Creek Dam and the Mardi-Mangrove Transfer System drains predominantly Narrabeen Group sandstone and Gosford Sandstone catchments — typically very soft terrain. The higher hardness at Terrigal (77.5 mg/L, TDS 143.9 mg/L) compared to Bateau Bay (30 mg/L) suggests a different distribution routing with elevated mineralisation — possibly incorporating local groundwater supplementation or a different blend proportion at the Terrigal coastal distribution sub-zone.
Terrigal residents can expect occasional moderate limescale on taps and in kettles — descaling every two to three months is typically adequate. Hot water systems benefit from periodic inspection. The low lead reading (0.002 mg/L) is excellent. Central Coast Council provides water quality information at centralcoast.nsw.gov.au, with all ADWG health standards consistently met. Terrigal's iconic coastal resort community and the Terrigal Beach foreshore precinct benefit from a safe supply meeting all ADWG standards.
Geology & Source: Supplied by Central Coast Council from the Mardi-Mangrove Transfer System — the Terrigal Central Coast coastal supply carries slightly hard water at 77.5 mg/L with TDS of 143.9 mg/L, harder than the soft Bateau Bay Central Coast sub-zone (30 mg/L) from the same supply system, reflecting the elevated mineralisation at the Terrigal coastal Central Coast distribution sub-zone compared to the softer inner Central Coast Narrabeen sandstone catchment sub-zones.