Narangba 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
707.5 mg/L
Est. Daily Cost
A$0.81
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 Narangba, your appliances are currently losing 34% efficiency due to mineral buildup.
| Appliance | In Narangba | 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 Narangba compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Narangba, Queensland | 255 mg/L | 🔴 Very Hard | mixed |
| Burpengary, Queensland | 224 mg/L | 🔴 Very Hard | mixed |
| Kallangur, Queensland | 205.5 mg/L | 🔴 Very Hard | mixed |
| North Lakes, Queensland | 205 mg/L | 🔴 Very Hard | mixed |
| Deception Bay, Queensland | 276.5 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How Narangba compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Narangba | 255 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Narangba's Water Unique?
Local geology and source profile
Narangba's drinking water is supplied by Unitywater, with bulk water managed by Seqwater primarily from North Pine Dam (Lake Kurwongbah) on the North Pine River, heavily supplemented by Lockyer Valley groundwater during dry periods through the south-east Queensland water grid, in the Moreton Bay LGA north of Brisbane, Queensland. Water hardness in Narangba is measured at 255 mg/L — classified as very hard, substantially exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. The elevated TDS of 707.5 mg/L confirms the dominant mineralised groundwater influence at this northern Moreton Bay residential corridor, harder than nearby Morayfield (195.5 mg/L) and North Lakes (205 mg/L) in the same Moreton Bay LGA.
Narangba's very hard supply reflects an extreme Lockyer Valley alluvial groundwater proportion in the local Unitywater distribution blend. The Lockyer Valley groundwater percolates through Triassic–Jurassic carbonate-cemented sedimentary formations of the Clarence-Moreton Basin — where calcium, magnesium, and associated dissolved mineral salts concentrate to very high levels over long groundwater residence times. The Narangba distribution node sits further from the North Pine Dam surface supply source, receiving a proportionally larger groundwater fraction than the softer North Lakes and Morayfield sub-zones, producing the elevated 255 mg/L at the Narangba tap.
Narangba residents face severe limescale challenges — kettle descaling is a weekly necessity, and shower screens accumulate heavy carbonate deposits. Hot water systems require annual element inspection at this hardness level. Solar hot water systems need regular professional servicing to prevent scale damage. Under Queensland water restrictions, outdoor irrigation is limited during dry periods. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. Unitywater publishes water quality data at unitywater.com.au, with all ADWG health standards met.
Geology & Source: Supplied by Unitywater with bulk water from Seqwater via the North Pine Dam system, heavily blended with Lockyer Valley alluvial groundwater during dry periods — the Narangba Moreton Bay northern corridor carries very hard supply at 255 mg/L with elevated TDS of 707.5 mg/L, substantially exceeding the ADWG aesthetic guideline, reflecting extreme Lockyer Valley groundwater influence at this northern Moreton Bay distribution node.