Logan City Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
8
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
551 mg/L
Est. Daily Cost
A$0.71
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 Logan City, your appliances are currently losing 30% efficiency due to mineral buildup.
| Appliance | In Logan City | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.2 yrs | 8.5 yrs | -74% |
| Washing Machine | 5.3 yrs | 12 yrs | -56% |
| Water Heater | 6.7 yrs | 15 yrs | -55% |
Regional Water Comparison
How Logan City compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Logan City, Queensland | 223.5 mg/L | 🔴 Very Hard | mixed |
| Brisbane, Queensland | 95 mg/L | 🟡 Moderately Hard | mixed |
| Gold Coast, Queensland | 100 mg/L | 🟡 Moderately Hard | mixed |
| Sunshine Coast, Queensland | 75 mg/L | 🟡 Moderately Hard | reservoir |
| Toowoomba, Queensland | 180 mg/L | 🔴 Very Hard | reservoir |
National Benchmark
How Logan City compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Logan City | 223.5 mg/L | 🔴 High |
| Australia National Avg | 81 mg/L | 🟡 Low |
| Hobart Top Rated | 11 mg/L | 🟢 None |
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What Makes Logan City's Water Unique?
Local geology and source profile
Logan City's drinking water is supplied by Queensland Urban Utilities (QUU), with bulk water managed by Seqwater primarily from the Wivenhoe Dam and supplemented by Lockyer Valley groundwater — elevated alluvial aquifers known for their mineral content — in south-east Queensland. Water hardness in Logan City is measured at 224 mg/L — classified as hard and exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Hardness levels can vary seasonally depending on the blend ratio between surface and groundwater sources.
Logan's elevated hardness is attributable largely to the Lockyer Valley alluvium component of its supply blend. The Lockyer Valley's shallow alluvial aquifers overlie Triassic–Jurassic sedimentary formations containing carbonate-cemented sandstone and gravel, where groundwater dissolves significant calcium bicarbonate as it moves through the aquifer matrix. When Wivenhoe surface water is blended with Lockyer Valley groundwater during dry periods, the hardness of the combined supply rises noticeably at the tap.
Logan City residents face substantial limescale accumulation on taps, shower screens, and kitchen appliances — kettle descaling every three to four weeks is common, and shower screen maintenance is an ongoing task. Solar hot water systems, popular in Queensland for their energy savings, are prone to significant scale build-up inside the collector tubes and storage cylinder at this hardness level; annual professional servicing is strongly recommended. Under Queensland water restrictions, residents are encouraged to manage outdoor irrigation carefully, while a scale inhibitor or whole-house water softener is a worthwhile investment for protecting indoor appliances long-term.
Geology & Source: Supplied by Queensland Urban Utilities with bulk water managed by Seqwater from the Wivenhoe Dam and Lockyer Valley groundwater in the Brisbane Valley system — water moving through Lockyer Valley alluvium and carbonate-cemented Triassic–Jurassic sediments dissolves elevated calcium and magnesium, producing hard supply at 224 mg/L, exceeding the ADWG aesthetic guideline of 200 mg/L.