Water hardness & quality in Mount Hawthorn
6016 · Perth Region · Reporting period 2023-2024
Reported by Water Corporation as the “Mt. Hawthorn” supply.
The verdict
Mount Hawthorn's water runs much saltier and harder than most other localities in the Perth Region.
Water hardness
Moderately hard110mg/L
Some scale builds up over time on kettles and shower heads. Most homes don't need a softener.
Measured at the Mount Hawthorn supply.
ADWG aesthetic guideline: 200 mg/L. Hardness affects scale and taste, not safety.
Compare water hardness across WA →At a glance
Position within the Perth Region
Purity
By-products & nitrate
About average for the Perth Region
Clarity
Turbidity, colour, metals
About average for the Perth Region
Taste
Sodium, chloride, TDS
Saltier than 91% of Perth Region supplies
Hardness
Calcium & magnesium
Harder than 77% of Perth Region supplies
pH balance
How close to neutral (7.0)
About average for the Perth Region
Full readings
Typical (mean) value at Mount Hawthorn versus the Perth Region average.
Purity & health
| Parameter | Mount Hawthorn | Region avg | Unit |
|---|---|---|---|
| Trihalomethanes (THMs) | 0.10 | 0.07 | mg/L |
| Nitrate | 1.8 | 2.3 | mg/L |
Clarity & appearance
| Parameter | Mount Hawthorn | Region avg | Unit |
|---|---|---|---|
| Iron | 0.03 | 0.03 | mg/L |
| Manganese | 0.01 | 0.01 | mg/L |
Taste & saltiness
| Parameter | Mount Hawthorn | Region avg | Unit |
|---|---|---|---|
| Sodium | 126 | 85.0 | mg/L |
| Chloride | 191 | 142 | mg/L |
| Total Dissolved Solids (TDS) | 564 | 400 | mg/L |
| Sulphate | 29.0 | 19.4 | mg/L |
Hardness & scale
| Parameter | Mount Hawthorn | Region avg | Unit |
|---|---|---|---|
| Hardness | 110 | 95.7 | mg/L |
| Alkalinity | 123 | 83.8 | mg/L |
| Silica | 16.5 | 8.9 | mg/L |
pH balance
| Parameter | Mount Hawthorn | Region avg | Unit |
|---|---|---|---|
| pH | 7.9 | 7.8 | pH units |
Compare nearby
All of Perth Region →Suburbs near Mount Hawthorn
These suburbs aren't individually tested — Mount Hawthorn is their closest monitored supply point.
Common questions
Is the tap water in Mount Hawthorn safe to drink?
In the 2023-2024 reporting year, Mount Hawthorn's supply met the NHMRC Australian Drinking Water Guidelines health limits for every parameter with published data.
How hard is the water in Mount Hawthorn?
Mount Hawthorn's water averages 110 mg/L of hardness (as calcium carbonate), which is moderately hard. That's harder than most of the Perth Region. Some scale builds up over time on kettles and shower heads. Most homes don't need a softener.
Is Mount Hawthorn's water fluoridated?
Yes — Water Corporation fluoridates the Mount Hawthorn supply. Fluoride averaged 0.82 mg/L in 2023-2024, within the ADWG limit of 1.5 mg/L.
Data & methodology
Data source: Water Corporation of WA Drinking Water Quality Annual Report 2023-2024.
Regional ranking: Each measured parameter is ranked against every other locality in the Perth Region using the typical (mean) reading. Lower readings rank better, except pH where the score is distance from neutral (7).
ADWG safety check: Every reading is independently checked against the NHMRC Australian Drinking Water Guidelines; any value above the limit is flagged regardless of how it compares to neighbours.