The Gap 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
502.5 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 The Gap, your appliances are currently losing 28% efficiency due to mineral buildup.
| Appliance | In The Gap | 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 The Gap compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ The Gap, Queensland | 210 mg/L | 🔴 Very Hard | mixed |
| Ashgrove, Queensland | 201.5 mg/L | 🔴 Very Hard | mixed |
| Toowong, Queensland | 189 mg/L | 🔴 Very Hard | mixed |
| Indooroopilly, Queensland | 211 mg/L | 🔴 Very Hard | mixed |
| Brisbane, Queensland | 95 mg/L | 🟡 Moderately Hard | mixed |
National Benchmark
How The Gap compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ The Gap | 210 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes The Gap's Water Unique?
Local geology and source profile
The Gap's drinking water is supplied by Urban Utilities (Queensland Urban Utilities) as water retailer, with bulk supply from Seqwater drawing from Lake Wivenhoe and Lake Somerset, supplemented by Lockyer Valley groundwater through the south-east Queensland water grid for the Brisbane City LGA inner western distribution in Queensland. Water hardness in The Gap is measured at 210 mg/L — classified as very hard, exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. The Gap — a large and popular inner western Brisbane suburb on the western slopes above the Enoggera Creek valley, known for its bushland setting along the D'Aguilar National Park edge and families seeking the spacious hinterland lifestyle — carries supply consistent with the Brisbane-wide Urban Utilities hard supply profile.
The Gap's elevated hardness reflects the Lockyer Valley groundwater supplement proportion in the inner western Brisbane Urban Utilities supply blend. Lake Wivenhoe and Somerset draw from Triassic–Jurassic granite terrain of the Great Dividing Range, 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 entire Brisbane grid to 210 mg/L and TDS 502.5 mg/L in the inner western distribution corridor.
The Gap residents face significant daily limescale challenges — kettle descaling every one to two weeks is common, and shower screens and tapware accumulate carbonate deposits. Hot water system elements require regular inspection. Under Queensland water restrictions, outdoor watering is limited during drought periods. The low lead reading (0.002 mg/L) is reassuring. Urban Utilities provides water quality information at urbanutilities.com.au, with all ADWG health standards consistently met. The Gap's bushland-fringe residential community may benefit from a whole-house or point-of-use filter system to reduce limescale build-up.
Geology & Source: Supplied by Urban Utilities (Queensland Urban Utilities) with bulk supply from Seqwater via Lake Wivenhoe and Lake Somerset, supplemented by Lockyer Valley groundwater through the south-east Queensland water grid — the Gap Brisbane inner western supply carries very hard water at 210 mg/L with elevated TDS of 502.5 mg/L, reflecting the Lockyer Valley groundwater proportion in the western Brisbane Urban Utilities distribution grid.