Murrumba Downs 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
700.3 mg/L
Est. Daily Cost
A$0.80
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 Murrumba Downs, your appliances are currently losing 34% efficiency due to mineral buildup.
| Appliance | In Murrumba Downs | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.2 yrs | 12 yrs | -65% |
| Water Heater | 5.4 yrs | 15 yrs | -64% |
Regional Water Comparison
How Murrumba Downs compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Murrumba Downs, Queensland | 254 mg/L | 🔴 Very Hard | mixed |
| Kallangur, Queensland | 205.5 mg/L | 🔴 Very Hard | mixed |
| North Lakes, Queensland | 205 mg/L | 🔴 Very Hard | mixed |
| Bray Park, Queensland | 286 mg/L | 🔴 Very Hard | mixed |
| Bracken Ridge, Queensland | 206.5 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How Murrumba Downs compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Murrumba Downs | 254 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Murrumba Downs's Water Unique?
Local geology and source profile
Murrumba Downs's drinking water is supplied by Unitywater as water retailer, with bulk supply from Seqwater incorporating dominant Lockyer Valley groundwater supplementation through the south-east Queensland water grid for the Moreton Bay Regional Council LGA outer northern Brisbane metropolitan distribution in Queensland. Water hardness in Murrumba Downs is measured at 254 mg/L — classified as hard, substantially exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Murrumba Downs — an outer northern Brisbane metropolitan suburb in the Moreton Bay Regional Council LGA in the Petrie–North Lakes growth corridor, known for the Murrumba Downs residential estate, the proximity to North Lakes retail precinct, and the Petrie University Precinct community of the outer northern Brisbane growth corridor — receives very hard supply consistent with the broader Moreton Bay Unitywater distribution.
Murrumba Downs's very hard supply reflects the very high Lockyer Valley groundwater proportion in the Moreton Bay Unitywater SEQ supply blend. The Lockyer Valley alluvial aquifer percolates through highly mineralised Jurassic–Cretaceous carbonate-cemented Darling Downs formations — accumulating very high dissolved calcium, magnesium, and carbonates. At 254 mg/L and TDS 700.3 mg/L, the Murrumba Downs Moreton Bay distribution is among the harder Unitywater sub-zones, consistent with the Nambour Unitywater sub-zone (247 mg/L) and driven by the dominant Lockyer Valley groundwater fraction in the outer northern Moreton Bay Unitywater supply blend.
Murrumba Downs residents face significant limescale challenges — kettle descaling every one to two weeks is typical, shower screens accumulate heavy deposits, and hot water systems require annual inspection. Under Queensland water restrictions, outdoor watering is regulated. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. Unitywater provides water quality information at unitywater.com.au, with all ADWG health standards consistently met. Murrumba Downs's outer northern Brisbane Moreton Bay growth community benefits from supply meeting all ADWG safe drinking standards.
Geology & Source: Supplied by Unitywater with bulk supply from Seqwater via dominant Lockyer Valley groundwater supplementation through the south-east Queensland water grid — the Murrumba Downs Moreton Bay outer northern Brisbane metropolitan supply carries hard water at 254 mg/L with extreme TDS of 700.3 mg/L, reflecting the very high Lockyer Valley groundwater proportion in the Moreton Bay Regional Council outer northern Unitywater Murrumba Downs distribution sub-zone.