Mount Yokine water supply area
Perth Region · Reporting period 2023-2024
Reported by Water Corporation as the “Mt. Yokine” supply.
Mount Yokine is a Water Corporation supply area rather than a suburb — it's the monitored source for the suburbs listed below.
The verdict
Mount Yokine's water runs much saltier and harder than most other localities in the Perth Region.
Water hardness
Moderately hard103mg/L
Some scale builds up over time on kettles and shower heads. Most homes don't need a softener.
Measured at the Mount Yokine 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
Less pure than 68% of Perth Region supplies
Clarity
Turbidity, colour, metals
About average for the Perth Region
Taste
Sodium, chloride, TDS
Saltier than 88% 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 Yokine versus the Perth Region average.
Purity & health
| Parameter | Mount Yokine | Region avg | Unit |
|---|---|---|---|
| Trihalomethanes (THMs) | 0.11 | 0.07 | mg/L |
| Nitrate | 1.8 | 2.3 | mg/L |
Clarity & appearance
| Parameter | Mount Yokine | Region avg | Unit |
|---|---|---|---|
| Iron | 0.03 | 0.03 | mg/L |
| Manganese | 0.01 | 0.01 | mg/L |
Taste & saltiness
| Parameter | Mount Yokine | Region avg | Unit |
|---|---|---|---|
| Sodium | 130 | 85.0 | mg/L |
| Chloride | 188 | 142 | mg/L |
| Total Dissolved Solids (TDS) | 560 | 400 | mg/L |
| Sulphate | 27.0 | 19.4 | mg/L |
Hardness & scale
| Parameter | Mount Yokine | Region avg | Unit |
|---|---|---|---|
| Hardness | 103 | 95.7 | mg/L |
| Alkalinity | 123 | 83.8 | mg/L |
| Silica | 16.8 | 8.9 | mg/L |
pH balance
| Parameter | Mount Yokine | Region avg | Unit |
|---|---|---|---|
| pH | 7.9 | 7.8 | pH units |
Compare nearby
All of Perth Region →Suburbs near Mount Yokine
These suburbs aren't individually tested — Mount Yokine is their closest monitored supply point.
Common questions
Is the tap water in Mount Yokine safe to drink?
In the 2023-2024 reporting year, Mount Yokine's supply met the NHMRC Australian Drinking Water Guidelines health limits for every parameter with published data.
How hard is the water in Mount Yokine?
Mount Yokine's water averages 103 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 Yokine's water fluoridated?
Yes — Water Corporation fluoridates the Mount Yokine supply. Fluoride averaged 0.83 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.