Preston Beach
South West Region · Western Australia · Reporting period 2023-2024
The verdict
Preston Beach's water is much clearer — though it runs much harder and much saltier than most of its 34 neighbours.
At a glance
Position within the South West Region
Purity
By-products & nitrate
Less pure than 84% of South West Region supplies
Clarity
Turbidity, colour, metals
Clearer than 88% of South West Region supplies
Taste
Sodium, chloride, TDS
Saltier than 89% of South West Region supplies
Hardness
Calcium & magnesium
Harder than 93% of South West Region supplies
pH balance
How close to neutral (7.0)
Further from neutral than 82% of South West Region supplies
Full readings
Typical (mean) value at Preston Beach versus the South West Region average.
Purity & health
| Parameter | Preston Beach | Region avg | Unit |
|---|---|---|---|
| Trihalomethanes (THMs) | 0.09 | 0.05 | mg/L |
| Nitrate | 4.0 | 2.2 | mg/L |
Clarity & appearance
| Parameter | Preston Beach | Region avg | Unit |
|---|---|---|---|
| Iron | 0.01 | 0.05 | mg/L |
Taste & saltiness
| Parameter | Preston Beach | Region avg | Unit |
|---|---|---|---|
| Sodium | 94.0 | 58.5 | mg/L |
| Chloride | 170 | 98.2 | mg/L |
| Total Dissolved Solids (TDS)Above ADWG | 757 | 324 | mg/L |
| Sulphate | 17.0 | 16.9 | mg/L |
Hardness & scale
| Parameter | Preston Beach | Region avg | Unit |
|---|---|---|---|
| HardnessAbove ADWG | 293 | 83.9 | mg/L |
| Alkalinity | 278 | 81.8 | mg/L |
| Silica | 16.0 | 11.0 | mg/L |
pH balance
| Parameter | Preston Beach | Region avg | Unit |
|---|---|---|---|
| pH | 8.3 | 7.7 | pH units |
Compare nearby
All of South West 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 South West 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.