Redland Bay Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
497 mg/L
Est. Daily Cost
A$0.66
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 Redland Bay, your appliances are currently losing 28% efficiency due to mineral buildup.
| Appliance | In Redland Bay | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.7 yrs | 8.5 yrs | -68% |
| Washing Machine | 5.8 yrs | 12 yrs | -52% |
| Water Heater | 7.2 yrs | 15 yrs | -52% |
Regional Water Comparison
How Redland Bay compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Redland Bay, Queensland | 210 mg/L | 🔴 Very Hard | mixed |
| Victoria Point, Queensland | 252.5 mg/L | 🔴 Very Hard | mixed |
| Thornlands, Queensland | 211 mg/L | 🔴 Very Hard | mixed |
| Cleveland, Queensland | 265 mg/L | 🔴 Very Hard | mixed |
| Alexandra Hills, Queensland | 266 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How Redland Bay compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Redland Bay | 210 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Redland Bay's Water Unique?
Local geology and source profile
Redland Bay's drinking water is supplied by Redland City Council Water as water retailer, with bulk supply from Seqwater drawing from Lake Wivenhoe, Lake Somerset, and Lockyer Valley groundwater through the south-east Queensland water grid for the Redland City LGA outer southern coastal distribution in Queensland. Water hardness in Redland Bay is measured at 210 mg/L — classified as very hard, marginally exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Redland Bay — a popular outer southeastern Redland City coastal community on the shore of Moreton Bay, known for its boat ramp and marina, fishing culture, water activities at the Redland Bay foreshore, and gateway to the Southern Moreton Bay Islands — carries supply consistent with the broader Redland City hard supply profile, somewhat softer than the harder northern Redland zones (Cleveland 265 mg/L, Victoria Point 252.5 mg/L).
Redland Bay's elevated hardness reflects the Lockyer Valley groundwater supplement proportion in the southern Redland City SEQ supply blend. Lake Wivenhoe and Somerset draw from Triassic–Jurassic granite terrain contributing moderately soft surface water, but Seqwater's supplementation from the Lockyer Valley alluvial aquifer — percolating through mineralised Jurassic–Cretaceous carbonate-cemented formations — elevates the southern Redland coastal distribution to 210 mg/L and TDS 497 mg/L. Redland Bay's lower hardness compared to northern Redland sub-zones may reflect a somewhat higher surface water proportion in the southern distribution corridor.
Redland Bay residents face significant daily limescale challenges — kettle descaling every one to two weeks is common, and shower screens and hot water systems accumulate carbonate deposits. Under Queensland water restrictions, outdoor watering is limited during drought periods. The low lead reading (0.002 mg/L) is reassuring. Redland City Council provides water quality information online, with all ADWG health standards consistently met. Redland Bay's marina and boating community benefits from a supply meeting all ADWG standards for drinking and household use.
Geology & Source: Supplied by Redland City Council Water with bulk supply from Seqwater via Lake Wivenhoe and Lake Somerset, supplemented by Lockyer Valley groundwater through the south-east Queensland water grid — the Redland Bay Redland City outer southern supply carries very hard water at 210 mg/L with TDS of 497 mg/L, reflecting the Lockyer Valley groundwater proportion in the southern Redland City coastal distribution zone.