Sunshine Coast Water Hardness & Quality Report (2026)
Water Hardness
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
150 mg/L
Est. Daily Cost
A$0.24
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 Sunshine Coast, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Sunshine Coast | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.6 yrs | 15 yrs | -16% |
Regional Water Comparison
How Sunshine Coast compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Sunshine Coast, Queensland | 75 mg/L | 🟡 Moderately Hard | reservoir |
| Brisbane, Queensland | 95 mg/L | 🟡 Moderately Hard | mixed |
| Logan City, Queensland | 223.5 mg/L | 🔴 Very Hard | mixed |
| Gold Coast, Queensland | 100 mg/L | 🟡 Moderately Hard | mixed |
| Toowoomba, Queensland | 180 mg/L | 🔴 Very Hard | reservoir |
National Benchmark
How Sunshine Coast compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Sunshine Coast | 75 mg/L | 🟡 Low |
| Australia National Avg | 81 mg/L | 🟡 Low |
| Hobart Top Rated | 11 mg/L | 🟢 None |
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What Makes Sunshine Coast's Water Unique?
Local geology and source profile
The Sunshine Coast's drinking water is supplied by Unitywater, with bulk water sourced and managed by Seqwater from Baroon Pocket Dam on Obi Obi Creek and Lake Macdonald in the Blackall Range hinterland, Queensland. Water hardness on the Sunshine Coast is measured at 75 mg/L — classified as slightly hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Baroon Pocket Dam, with a capacity of around 61 gigalitres, is the region's primary storage.
The Sunshine Coast's moderate hardness reflects its hinterland catchment geology. The Blackall Range and Mapleton plateau area sits above d'Aguilar Range sandstone and metamorphic schist formations, where water percolating through fractured rock picks up modest quantities of calcium and magnesium. Seasonal rainfall patterns across the coastal hinterland produce some variation in hardness levels, though the supply consistently reads in the slightly-to-moderately hard category throughout the year.
Sunshine Coast households can expect light limescale accumulation on taps and around shower fittings, with kettle descaling recommended every two to three months. Hot water systems will accumulate some scale on heating elements over time, and an annual inspection is worthwhile to maintain energy efficiency. Under Queensland water restrictions, which can apply during drier periods, Sunshine Coast residents are encouraged to observe staged outdoor irrigation limits — making indoor appliance efficiency and everyday water-saving habits a practical year-round priority for households throughout the region.
Geology & Source: Supplied by Unitywater with bulk water managed by Seqwater from Baroon Pocket Dam and Lake Macdonald in the Blackall Range hinterland — water filtering through d'Aguilar Range sandstone and metamorphic schist accumulates moderate mineral content, producing mildly hard supply at 75 mg/L.