Alexandra Hills Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
8.3
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
747.7 mg/L
Est. Daily Cost
A$0.84
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 Alexandra Hills, your appliances are currently losing 35% efficiency due to mineral buildup.
| Appliance | In Alexandra Hills | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.8 yrs | 12 yrs | -68% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Alexandra Hills compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Alexandra Hills, Queensland | 266 mg/L | 🔴 Very Hard | mixed |
| Capalaba, Queensland | 204.5 mg/L | 🔴 Very Hard | mixed |
| Cleveland, Queensland | 265 mg/L | 🔴 Very Hard | mixed |
| Thornlands, Queensland | 211 mg/L | 🔴 Very Hard | mixed |
| Birkdale, Queensland | 231 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How Alexandra Hills compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Alexandra Hills | 266 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Alexandra Hills's Water Unique?
Local geology and source profile
Alexandra Hills' 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 eastern Brisbane corridor in Queensland. Water hardness in Alexandra Hills is measured at 266 mg/L — classified as very hard, significantly exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Alexandra Hills — a large and established outer eastern residential suburb of Redland City between the Cleveland corridor and the Capalaba commercial hub — carries notably harder supply than the adjacent Capalaba sub-zone (204.5 mg/L) in the same Redland City LGA, reflecting a higher Lockyer Valley groundwater proportion at the Alexandra Hills outer eastern distribution node.
Alexandra Hills' elevated hardness reflects the dominant Lockyer Valley groundwater supplementation in the outer Redland City SEQ supply grid blend. Lake Wivenhoe and Somerset draw from Triassic–Jurassic granite terrain of the Great Dividing Range, contributing relatively soft surface water, but Seqwater's extraction from the Lockyer Valley alluvial aquifer — percolating through Jurassic–Cretaceous carbonate-cemented formations — elevates supply to 266 mg/L and TDS 747.7 mg/L at the Alexandra Hills distribution sub-zone, reflecting the elevated Lockyer Valley proportion at this outer eastern Redland corridor.
Alexandra Hills residents face severe daily limescale challenges — kettle descaling every week is standard, shower screens accumulate heavy white deposits, and hot water systems require regular professional inspection. Solar hot water systems need annual servicing to prevent scale damage. Under Queensland water restrictions, outdoor watering is limited during drought periods. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. Redland City Council provides water quality data online, with all ADWG health standards consistently met.
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 Alexandra Hills Redland City outer eastern Brisbane supply carries very hard water at 266 mg/L with extreme TDS of 747.7 mg/L, reflecting the dominant Lockyer Valley groundwater proportion at this outer Redland City distribution zone.