Rochedale South Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
8.2
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
637.4 mg/L
Est. Daily Cost
A$0.77
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 Rochedale South, your appliances are currently losing 32% efficiency due to mineral buildup.
| Appliance | In Rochedale South | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.6 yrs | 8.5 yrs | -81% |
| Washing Machine | 4.6 yrs | 12 yrs | -62% |
| Water Heater | 5.9 yrs | 15 yrs | -61% |
Regional Water Comparison
How Rochedale South compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Rochedale South, Queensland | 243 mg/L | 🔴 Very Hard | mixed |
| Eight Mile Plains, Queensland | 220.5 mg/L | 🔴 Very Hard | mixed |
| Woodridge, Queensland | 271 mg/L | 🔴 Very Hard | mixed |
| Logan City, Queensland | 223.5 mg/L | 🔴 Very Hard | mixed |
| Wishart, Queensland | 255 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How Rochedale South compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rochedale South | 243 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Rochedale South's Water Unique?
Local geology and source profile
Rochedale South's drinking water is supplied by Logan Water (Logan 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 Logan City LGA outer eastern Brisbane distribution in Queensland. Water hardness in Rochedale South is measured at 243 mg/L — classified as very hard, significantly exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Rochedale South — a large residential suburb on the Logan City LGA northern border with Brisbane City, known for the Rochedale South Commercial Village, quality residential estates, and easy access to the M1 Pacific Motorway — carries supply consistent with the Logan City's harder supply profile.
Rochedale South's elevated hardness reflects the dominant Lockyer Valley groundwater supplement proportion in the Logan 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 highly mineralised Jurassic–Cretaceous carbonate-cemented formations — elevates the Logan City outer eastern distribution to 243 mg/L and TDS 637.4 mg/L. Rochedale South's hardness is consistent with the broader Logan City supply range (243 mg/L) reflecting the dominant Lockyer groundwater fraction in this outer eastern supply corridor.
Rochedale South residents face severe daily limescale challenges — kettle descaling every one to two weeks is standard, shower screens accumulate significant carbonate deposits, and hot water system elements require annual inspection. Under Queensland water restrictions, outdoor watering is limited during drought. The elevated lead reading (0.003 mg/L) warrants briefly running the cold tap before use. Logan Water provides water quality information online, with all ADWG health standards consistently met. A water filter or softener system is a worthwhile investment for Rochedale South's established residential community.
Geology & Source: Supplied by Logan Water (Logan City Council) with bulk supply from Seqwater via Lake Wivenhoe and Lake Somerset, supplemented by Lockyer Valley groundwater through the south-east Queensland water grid — the Rochedale South Logan City outer eastern Brisbane supply carries very hard water at 243 mg/L with elevated TDS of 637.4 mg/L, reflecting the dominant Lockyer Valley groundwater proportion in the Logan City distribution grid.