Tewantin 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
482.5 mg/L
Est. Daily Cost
A$0.62
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 Tewantin, your appliances are currently losing 26% efficiency due to mineral buildup.
| Appliance | In Tewantin | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.1 yrs | 8.5 yrs | -64% |
| Washing Machine | 6.3 yrs | 12 yrs | -48% |
| Water Heater | 7.7 yrs | 15 yrs | -49% |
Regional Water Comparison
How Tewantin compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Tewantin, Queensland | 197 mg/L | 🔴 Very Hard | mixed |
| Nambour, Queensland | 247 mg/L | 🔴 Very Hard | mixed |
| Sunshine Coast, Queensland | 75 mg/L | 🟡 Moderately Hard | reservoir |
| Maroochydore, Queensland | 239.5 mg/L | 🔴 Very Hard | mixed |
| Buderim, Queensland | 235 mg/L | 🔴 Very Hard | mixed |
National Benchmark
How Tewantin compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Tewantin | 197 mg/L | 🔴 High |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Tewantin's Water Unique?
Local geology and source profile
Tewantin's drinking water is supplied by Noosa Council directly, drawing from Lake Cootharaba on the Noosa River and supplemented via the south-east Queensland Water Grid for the Noosa Shire Council LGA regional distribution in Queensland. Water hardness in Tewantin is measured at 197 mg/L — classified as hard, approaching the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Tewantin — the principal commercial and administrative centre of the Noosa Shire, situated at the mouth of the Noosa River adjacent to Noosaville and Noosa National Park, known for the Tewantin town centre, the Noosa Marina and River Heads ferry to Cooloola National Park, the Noosa River houseboat and leisure community, and the heritage-listed community of the Noosa Shire since its de-amalgamation from Sunshine Coast Regional Council in 2014 — receives hard supply approaching the ADWG aesthetic guideline from the Noosa Council distribution.
Tewantin's elevated hardness reflects the SEQ Water Grid Lockyer Valley groundwater supplement contribution at this Noosa Shire distribution sub-zone. While the primary Lake Cootharaba (Noosa River system) and Lake Weyba surface water sources provide moderately soft supply from the Great Sandy National Park and Cooloola sandplain terrain, the SEQ Water Grid supplementation introduces highly mineralised Lockyer Valley alluvial groundwater — percolating through Jurassic–Cretaceous carbonate-cemented Darling Downs formations — driving the Tewantin supply to 197 mg/L and TDS 482.5 mg/L at the Noosa Shire distribution sub-zone.
Tewantin residents face moderate-to-significant limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from regular inspection. The low lead reading (0.002 mg/L) is excellent. Under Queensland water restrictions, outdoor watering is regulated. Noosa Council provides water quality information online, with all ADWG health standards consistently met. Tewantin's Noosa River marina and leisure community benefits from supply meeting all ADWG safe drinking standards.
Geology & Source: Supplied by Noosa Council from Lake Cootharaba (Noosa River system) and supplementation via the SEQ Water Grid — the Tewantin Noosa Shire regional supply carries hard water at 197 mg/L with TDS of 482.5 mg/L, approaching the ADWG aesthetic guideline of 200 mg/L, reflecting the SEQ Water Grid Lockyer Valley groundwater supplement proportion in the Noosa Shire Tewantin distribution sub-zone.