Water hardness & quality in Darlington
6070 · Perth Region · Reporting period 2023-2024
Reported by Water Corporation as the “Greenmount/Darlington” supply.
The verdict
Darlington's water is clearer — though it runs further from neutral pH than most of its 27 neighbours.
Water hardness
Moderately hard73mg/L
Some scale builds up over time on kettles and shower heads. Most homes don't need a softener.
Measured at the Darlington 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
Clearer than 78% of Perth Region supplies
Taste
Sodium, chloride, TDS
About average for the Perth Region
Hardness
Calcium & magnesium
About average for the Perth Region
pH balance
How close to neutral (7.0)
Further from neutral than 67% of Perth Region supplies
Full readings
Typical (mean) value at Darlington versus the Perth Region average.
Purity & health
| Parameter | Darlington | Region avg | Unit |
|---|---|---|---|
| Trihalomethanes (THMs) | 0.10 | 0.07 | mg/L |
| Nitrate | 0.40 | 2.3 | mg/L |
Clarity & appearance
| Parameter | Darlington | Region avg | Unit |
|---|---|---|---|
| Aluminium | 0.01 | 0.01 | mg/L |
| Iron | 0.02 | 0.03 | mg/L |
| Manganese | 0.00 | 0.01 | mg/L |
Taste & saltiness
| Parameter | Darlington | Region avg | Unit |
|---|---|---|---|
| Sodium | 88.0 | 85.0 | mg/L |
| Chloride | 148 | 142 | mg/L |
| Total Dissolved Solids (TDS) | 378 | 400 | mg/L |
| Sulphate | 17.0 | 19.4 | mg/L |
Hardness & scale
| Parameter | Darlington | Region avg | Unit |
|---|---|---|---|
| Hardness | 73.0 | 95.7 | mg/L |
| Alkalinity | 72.0 | 83.8 | mg/L |
| Silica | 5.2 | 8.9 | mg/L |
pH balance
| Parameter | Darlington | Region avg | Unit |
|---|---|---|---|
| pH | 7.9 | 7.8 | pH units |
Compare nearby
All of Perth Region →Suburbs near Darlington
These suburbs aren't individually tested — Darlington is their closest monitored supply point.
Common questions
Is the tap water in Darlington safe to drink?
In the 2023-2024 reporting year, Darlington's supply met the NHMRC Australian Drinking Water Guidelines health limits for every parameter with published data.
How hard is the water in Darlington?
Darlington's water averages 73 mg/L of hardness (as calcium carbonate), which is moderately hard. That's about average for the Perth Region. Some scale builds up over time on kettles and shower heads. Most homes don't need a softener.
Is Darlington's water fluoridated?
Yes — Water Corporation fluoridates the Darlington supply. Fluoride averaged 0.81 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.