Tap Water Quality in Cottesloe, WA
Postcode 6011 · Supplied by Water Corporation via Mt Eliza
Quality Score
About Cottesloe
Cottesloe is a suburb of 7,750 residents in Western Australia (postcode 6011). The median age is 44. It falls within the Water Corporation area. Neighbouring suburbs include Peppermint Grove, Claremont, Swanbourne, Claremont North.
Most residents own outright (45%), while 27% rent, while 26% own their home with a mortgage. The median household income is $174,252 per year. The top countries of birth for residents are United Kingdom (40%), South Africa (7%), and New Zealand (7%).
Tap water in Cottesloe is supplied by Water Corporation. The suburb receives water via the Mt Eliza supply zone.
Water quality summary
Based on 2024-25 water quality reports, Cottesloe achieves a WaterScore of 9.2 out of 10, rated excellent overall. Water hardness measures 57 mg/L, classified as soft. This is gentle on appliances and skin, with minimal limescale buildup expected. The pH level is 7.95, which is within the ADWG guideline range of 6.5–8.5. The water is fluoridated at 0.81 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 349 mg/L, considered moderate against the ADWG guideline of 600 mg/L. Turbidity is 0.2 NTU, indicating clear water, within the ADWG guideline of 5 NTU.
Compare with nearby suburbs: Peppermint Grove , Claremont , Swanbourne
Census Data
Suburb snapshot
Population
Median Age
Median Income
Owner-occupied
Recommended filters for Cottesloe
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 Cottesloe's water profile.
ZeroWater
23-Cup Dispenser (incl. TDS Meter)
4.3 · 27,123 ratings on Amazon
A reliable 23-cup dispenser (incl. tds meter) suitable for Cottesloe'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 Cottesloe's water profile.
Comparison
How Cottesloe compares
Compared to Western Australia and national averages
| Metric | Cottesloe | WA Avg | National Avg |
|---|---|---|---|
| Hardness | 57 mg/L | 99.8 mg/L | 80.3 mg/L |
| pH | 7.95 | 7.9 | 7.8 |
| Fluoride | 0.81 mg/L | 0.7 mg/L | 0.7 mg/L |
| Turbidity | 0.2 NTU | 0.2 NTU | 0.4 NTU |
| TDS | 349 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 | 55 | mg/L CaCO3 | No limit | Measured |
| Aluminium | 0.009 | mg/L | < 0.2 | Good |
| Chloride | 150 | mg/L | < 250 | Good |
| Hardness | 57 | mg/L CaCO3 | < 200 | Good |
| Iron | 0.046 | mg/L | < 0.3 | Good |
| Manganese | 0.007 | mg/L | < 0.1 | Good |
| pH | 7.95 | pH units | 6.5 – 8.5 | Normal |
| Sodium | 89 | mg/L | < 180 | Good |
| Sulfate | 12 | mg/L | < 500 | Good |
| Total Dissolved Solids | 349 | mg/L | < 600 | Good |
| Colour | 1 | HU | < 15 | Good |
| Turbidity | 0.2 | NTU | < 5 | Good |
| Fluoride | 0.81 | mg/L | < 1.5 | Good |
| Nitrate | 0.2 | mg/L | < 50 | Good |
| Trihalomethanes | 0.06 | 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 (57 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 7.95 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 0.81 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 Cottesloe.
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
Cottesloe's water is soft at 57 mg/L. You can use less soap and detergent, as it lathers easily with softer water.
Fluoride in Your Water
Fluoride measures 0.81 mg/L in Cottesloe. Australian guidelines allow up to 1.5 mg/L. This is added by utilities to support dental health in the community.
Consider a Filter for TDS
Total dissolved solids measure 349 mg/L. A reverse osmosis filter can reduce dissolved minerals if you prefer a cleaner taste in drinking water.
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We'll email you when Cottesloe's water data is updated.
FAQ
Frequently asked questions
Is tap water safe to drink in Cottesloe?
How hard is the water in Cottesloe?
What water utility supplies Cottesloe?
Does Cottesloe water have fluoride?
What is the water quality score for Cottesloe?
What is the population of Cottesloe?
Supplier
Water utility
- Utility
- Water Corporation
- Supply Zone
- Mt Eliza
- 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 8.2 and 10.0
Utility reports average the grid — not your home
Cottesloe'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 Cottesloe
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 Cottesloe, WA [Data set]. Compiled from Water Corporation data (2024-25 annual report). https://waterscore.com.au/water-quality/cottesloe-wa/
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Related
Explore more
Related pages for Cottesloe, WA
Is tap water safe?
Safety assessment
Water hardness
57 mg/L
Best water filter
Filter recommendations
Western Australia water quality
State coverage
Water Corporation
Water utility
Compare with Peppermint Grove
Cottesloe vs Peppermint Grove
Compare with Swanbourne
Cottesloe vs Swanbourne
Compare with Mount Claremont
Cottesloe vs Mount Claremont
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.