Tap Water Quality in Thornlie, WA
Postcode 6108 · Supplied by Water Corporation via Hills Direct
Quality Score
About Thornlie
Thornlie is a suburb of 23,665 residents in Western Australia (postcode 6108). The median age is 38. It falls within the Water Corporation area. Neighbouring suburbs include Langford, Lynwood, Parkwood, Beckenham.
Most residents own their home with a mortgage (43%), while 33% own outright, while 21% rent. The median household income is $81,692 per year. The top countries of birth for residents are United Kingdom (19%), India (10%), and Malaysia (8%).
Tap water in Thornlie is supplied by Water Corporation. The suburb receives water via the Hills Direct supply zone.
Water quality summary
Based on 2024-25 water quality reports, Thornlie achieves a WaterScore of 9.5 out of 10, rated excellent overall. Water hardness measures 48 mg/L, classified as soft. This is gentle on appliances and skin, with minimal limescale buildup expected. The pH level is 7.61, which is within the ADWG guideline range of 6.5–8.5. The water is fluoridated at 0.82 mg/L, within the recommended range of 0.6–1.1 mg/L for dental health, well under the ADWG maximum of 1.5 mg/L. Total dissolved solids (TDS) measure 187 mg/L, considered low against the ADWG guideline of 600 mg/L. Turbidity is 0.2 NTU, indicating clear water, within the ADWG guideline of 5 NTU.
Census Data
Suburb snapshot
Population
Median Age
Median Income
Owner-occupied
Recommended filters for Thornlie
Products matched to your water profile
BRITA
Marella 2.4L Fridge Water Filter Jug (Maxtra Pro)
4.8 · 125 ratings on Amazon
A reliable marella 2.4l fridge water filter jug (maxtra pro) suitable for Thornlie's water profile.
ZeroWater
2.8L 5-Stage Jug (IAPMO Certified: PFOA/PFOS + Lead)
4.2 · 5,315 ratings on Amazon
A reliable 2.8l 5-stage jug (iapmo certified: pfoa/pfos + lead) suitable for Thornlie's water profile.
Purewell
8.5L Stainless Steel Gravity System
4.4 · 1,137 ratings on Amazon
A reliable 8.5l stainless steel gravity system suitable for Thornlie's water profile.
Comparison
How Thornlie compares
Compared to Western Australia and national averages
| Metric | Thornlie | WA Avg | National Avg |
|---|---|---|---|
| Hardness | 48 mg/L | 99.8 mg/L | 80.3 mg/L |
| pH | 7.61 | 7.9 | 7.8 |
| Fluoride | 0.82 mg/L | 0.7 mg/L | 0.7 mg/L |
| Turbidity | 0.2 NTU | 0.2 NTU | 0.4 NTU |
| TDS | 187 mg/L | 434.2 mg/L | 267.4 mg/L |
Full Results
Detailed water quality data
All values compared against Australian Drinking Water Guidelines (ADWG)
| Parameter | Value | Unit | ADWG Guideline | Status |
|---|---|---|---|---|
| Alkalinity | 39 | mg/L CaCO3 | No limit | Measured |
| Aluminium | 0.01 | mg/L | < 0.2 | Good |
| Chloride | 70 | mg/L | < 250 | Good |
| Hardness | 48 | mg/L CaCO3 | < 200 | Good |
| Iron | 0.033 | mg/L | < 0.3 | Good |
| Manganese | 0.004 | mg/L | < 0.1 | Good |
| pH | 7.61 | pH units | 6.5 – 8.5 | Normal |
| Sodium | 39 | mg/L | < 180 | Good |
| Sulfate | 7 | mg/L | < 500 | Good |
| Total Dissolved Solids | 187 | mg/L | < 600 | Good |
| Colour | 1 | HU | < 15 | Good |
| Turbidity | 0.2 | NTU | < 5 | Good |
| Fluoride | 0.82 | mg/L | < 1.5 | Good |
| Nitrate | 0.2 | mg/L | < 50 | Good |
| Trihalomethanes | 0.031 | mg/L | < 0.25 | Good |
Safety
Safety assessment
Based on 15 parameters tested, all results fall within Australian Drinking Water Guidelines.
Based on comparison with Australian Drinking Water Guidelines (ADWG)
Explained
What these numbers mean
Soft (48 mg/L)
Water Hardness
Your water is classified as soft, which means minimal limescale buildup on fixtures and appliances. Soap and shampoo will lather easily, and you should notice no drying effects on skin or hair. Hot water systems and kettles are unlikely to suffer scale-related efficiency losses.
Normal Range
pH Level
pH of 7.61 is within the ideal range of 6.5–8.5. The ADWG recommends pH between 6.5 and 8.5 for drinking water.
Fluoridated
Fluoride
Fluoride at 0.82 mg/L. Within the recommended 0.6–1.1 mg/L range for dental health.
Data unavailable
Disinfection
Chlorine data is not currently available for Thornlie.
Learn more about these measurements in our water quality glossary — including Hardness , pH , Fluoride , and ADWG guidelines .
Advice
Practical tips for residents
Soft Water Advantage
Thornlie's water is soft at 48 mg/L. You can use less soap and detergent, as it lathers easily with softer water.
Fluoride in Your Water
Fluoride measures 0.82 mg/L in Thornlie. Australian guidelines allow up to 1.5 mg/L. This is added by utilities to support dental health in the community.
Flush After Absence
If your home has been unoccupied for several days, run the kitchen tap for 30 seconds before drinking. This clears stale water that has been sitting in pipes.
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We'll email you when Thornlie's water data is updated.
FAQ
Frequently asked questions
Is tap water safe to drink in Thornlie?
How hard is the water in Thornlie?
What water utility supplies Thornlie?
Does Thornlie water have fluoride?
What is the water quality score for Thornlie?
What is the population of Thornlie?
Supplier
Water utility
- Utility
- Water Corporation
- Supply Zone
- Hills Direct
- Data Source
- Water Corporation — WC Perth Aesthetic Tables 2024 25, WC Perth Health Tables 2024 25
Nearby
Nearby suburbs
Same water utility, similar water quality
Similar Quality
Suburbs with similar water quality
Suburbs scoring between 8.5 and 10.0
Utility reports average the grid — not your home
Thornlie's water meets ADWG standards at the source, but old pipes, roof tanks, and ageing plumbing can add lead, copper or bacteria before the water reaches your tap. These won't show up in your utility report.
Check your own tap before buying a filter or assuming the suburb average matches your home.
Tetra
EasyStrips 6-in-1 Water Test (100 strips)
4.6 · 8,650 ratings on Amazon
Tests 6 parameters in 60 seconds: hardness, chlorine, pH, nitrate, nitrite, alkalinity. Cheapest way to verify your utility data.
Test my tap →Sponsored Amazon link. Check Amazon for current price and availability.
Heavy Metals
Drinking Water Test Kit (Lead, Copper, Iron, Mercury)
4.2 · 250 ratings on Amazon
20 tests. Detects lead, copper, iron, mercury — the things utility reports miss. Mobile-app results, EPA-standard thresholds.
Check metals kit →Sponsored Amazon link. Check Amazon for current price and availability.
Guides for Perth and WA
In-depth articles on the water supply that serves Thornlie
Cite
Cite this page
Free to quote and reuse with a credit to WaterScore and a link to this page. Journalists and researchers can find key figures and contacts on our press and data page.
WaterScore. (2026). Tap water quality in Thornlie, WA [Data set]. Compiled from Water Corporation data (2024-25 annual report). https://waterscore.com.au/water-quality/thornlie-wa/
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Related
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Water Corporation
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Disclaimer: The information on this page is for general informational purposes only and does not constitute medical advice, health recommendations, or professional guidance. Water quality data is sourced from Water Corporation (2024-25 annual report) and reflects conditions at the time of utility testing — it may not reflect real-time water quality at your tap. Actual water quality can vary due to local plumbing, seasonal changes, and distance from the treatment plant. For specific health concerns, consult a qualified health professional. For the most current water quality information, contact your local water utility directly. See our Terms of Use.