Kirwan Water Hardness & Quality Report (2026)
Water Hardness
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
100.8 mg/L
Est. Daily Cost
A$0.14
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 Kirwan, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Kirwan | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.1 yrs | 8.5 yrs | -5% |
| Washing Machine | 11.9 yrs | 12 yrs | -1% |
| Water Heater | 13.8 yrs | 15 yrs | -8% |
Regional Water Comparison
How Kirwan compares to its nearest neighbours
| City | Hardness | Risk | Source |
|---|---|---|---|
| ▶ Kirwan, Queensland | 45 mg/L | 🟢 Soft | mixed |
| Kelso, Queensland | 41 mg/L | 🟢 Soft | mixed |
| Townsville, Queensland | 65 mg/L | 🟡 Moderately Hard | river |
| Bowen, Queensland | 139 mg/L | 🟠 Hard | mixed |
| Edmonton, Queensland | 76.5 mg/L | 🟡 Moderately Hard | mixed |
National Benchmark
How Kirwan compares to the Australia average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Kirwan | 45 mg/L | 🟢 None |
| Australia National Avg | 125 mg/L | 🟠 Moderate |
| Boronia Top Rated | 5 mg/L | 🟢 None |
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What Makes Kirwan's Water Unique?
Local geology and source profile
Kirwan's drinking water is supplied by Townsville City Council Water, drawing from Ross River Dam on the Ross River and supplementary Paluma Dam storage in the Paluma Range rainforest, serving the Townsville LGA outer northern residential suburb of Kirwan in Queensland. Water hardness in Kirwan is measured at 45 mg/L — classified as soft — well within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Kirwan, one of Townsville's largest residential suburbs adjacent to the James Cook University precinct and Stockland Kirwan shopping centre, benefits from soft supply characteristic of the Townsville coastal ranges granite terrain.
Kirwan's soft supply reflects the Precambrian granite and metamorphic geology of the Ross River Dam catchment. The Mount Spec Range and Paluma Range north-west of Townsville are composed of ancient Precambrian granites and metasediments — highly resistant crystalline formations contributing negligible dissolved minerals to catchment runoff. The Ross River Dam collects stormwater from this low-mineral terrain, producing a naturally soft supply that requires minimal treatment before distribution. The mixed source classification reflects occasional contributions from supplementary bore sources during dry periods, which carry slightly higher mineral content from the underlying Townsville coastal plain alluvial aquifer.
Kirwan residents enjoy very low limescale accumulation on taps, in kettles, and around shower fittings — descaling every two to three months is generally adequate. Hot water systems accumulate minimal scale throughout their service life. Townsville's tropical climate brings intense seasonal wet season rainfall and extended dry periods; Townsville City Council manages dam levels and supply security accordingly. All ADWG health standards are consistently met throughout the Townsville supply zone, and Kirwan's soft supply is a practical benefit for this large outer suburban community.
Geology & Source: Supplied by Townsville City Council Water from Ross River Dam and Paluma Range catchment impoundments — the Kirwan Townsville outer suburban supply carries soft water at 45 mg/L, characteristic of the Precambrian granite and metamorphic terrain of the coastal ranges supplying Townsville's Ross River Dam and the softer Paluma Range highland reservoirs.