Lake Grace
Great Southern Region · Western Australia · Reporting period 2023-2024
The verdict
Lake Grace's water is clearer and fresher — though it runs much further from neutral pH and less pure than most of its 58 neighbours.
At a glance
Position within the Great Southern Region
Purity
By-products & nitrate
Less pure than 78% of Great Southern Region supplies
Clarity
Turbidity, colour, metals
Clearer than 71% of Great Southern Region supplies
Taste
Sodium, chloride, TDS
Fresher than 66% of Great Southern Region supplies
Hardness
Calcium & magnesium
About average for the Great Southern Region
pH balance
How close to neutral (7.0)
Further from neutral than 90% of Great Southern Region supplies
Full readings
Typical (mean) value at Lake Grace versus the Great Southern Region average.
Purity & health
| Parameter | Lake Grace | Region avg | Unit |
|---|---|---|---|
| Trihalomethanes (THMs) | 0.10 | 0.07 | mg/L |
Clarity & appearance
| Parameter | Lake Grace | Region avg | Unit |
|---|---|---|---|
| Turbidity | 0.30 | 0.53 | NTU |
| Aluminium | 0.02 | 0.02 | mg/L |
| Iron | 0.07 | 0.10 | mg/L |
| Manganese | 0.00 | 0.01 | mg/L |
Taste & saltiness
| Parameter | Lake Grace | Region avg | Unit |
|---|---|---|---|
| Sodium | 39.8 | 58.9 | mg/L |
| Chloride | 85.0 | 111 | mg/L |
| Total Dissolved Solids (TDS) | 189 | 324 | mg/L |
| Sulphate | 10.0 | 16.7 | mg/L |
Hardness & scale
| Parameter | Lake Grace | Region avg | Unit |
|---|---|---|---|
| Hardness | 53.0 | 101 | mg/L |
| Alkalinity | 19.0 | 70.2 | mg/L |
| Silica | 3.5 | 8.3 | mg/L |
pH balance
| Parameter | Lake Grace | Region avg | Unit |
|---|---|---|---|
| pHAbove ADWG | 8.5 | 7.7 | pH units |
Compare nearby
All of Great Southern 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 Great Southern 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.