Two Rocks
Perth Region · Western Australia · Reporting period 2023-2024
The verdict
Two Rocks's water is much clearer and much closer to neutral pH — though it runs much harder than most of its 27 neighbours.
At a glance
Position within the Perth Region
Purity
By-products & nitrate
About average for the Perth Region
Clarity
Turbidity, colour, metals
Clearer than 100% of Perth Region supplies
Taste
Sodium, chloride, TDS
About average for the Perth Region
Hardness
Calcium & magnesium
Harder than 86% of Perth Region supplies
pH balance
How close to neutral (7.0)
More neutral than 89% of Perth Region supplies
Full readings
Typical (mean) value at Two Rocks versus the Perth Region average.
Purity & health
| Parameter | Two Rocks | Region avg | Unit |
|---|---|---|---|
| Trihalomethanes (THMs) | 0.01 | 0.07 | mg/L |
| Nitrate | 4.0 | 2.3 | mg/L |
Clarity & appearance
| Parameter | Two Rocks | Region avg | Unit |
|---|---|---|---|
| Iron | 0.00 | 0.03 | mg/L |
Taste & saltiness
| Parameter | Two Rocks | Region avg | Unit |
|---|---|---|---|
| Sodium | 57.0 | 85.0 | mg/L |
| Chloride | 106 | 142 | mg/L |
| Total Dissolved Solids (TDS) | 535 | 400 | mg/L |
| Sulphate | 16.0 | 19.4 | mg/L |
Hardness & scale
| Parameter | Two Rocks | Region avg | Unit |
|---|---|---|---|
| HardnessAbove ADWG | 228 | 95.7 | mg/L |
| Alkalinity | 210 | 83.8 | mg/L |
| Silica | 11.5 | 8.9 | mg/L |
pH balance
| Parameter | Two Rocks | Region avg | Unit |
|---|---|---|---|
| pH | 7.6 | 7.8 | pH units |
Compare nearby
All of Perth Region →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.