Tap Water Quality in Guildford, WA
Postcode 6055 · Supplied by Water Corporation via Greenmount
Quality Score
About Guildford
Guildford is a suburb of 2,040 residents in Western Australia (postcode 6055). The median age is 46. It falls within the Water Corporation area. Neighbouring suburbs include Ashfield, Bassendean, Eden Hill, Kiara.
Most residents own their home with a mortgage (44%), while 33% own outright, while 20% rent. The median household income is $114,764 per year. The top countries of birth for residents are United Kingdom (43%), New Zealand (13%), and India (4%).
Tap water in Guildford is supplied by Water Corporation. The suburb receives water via the Greenmount supply zone.
Water quality summary
Based on 2024-25 water quality reports, Guildford achieves a WaterScore of 9.0 out of 10, rated excellent overall. Water hardness measures 95 mg/L, classified as moderately hard. This may cause light mineral deposits on fixtures over time. The pH level is 8.23, which is within the ADWG guideline range of 6.5–8.5. The water is fluoridated at 0.84 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 497 mg/L, considered moderate against the ADWG guideline of 600 mg/L. Turbidity is 0.1 NTU, indicating clear water, within the ADWG guideline of 5 NTU.
Compare with nearby suburbs: Ashfield , Bassendean , Eden Hill
Census Data
Suburb snapshot
Population
Median Age
Median Income
Owner-occupied
Recommended filters for Guildford
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 Guildford'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 Guildford'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 Guildford's water profile.
Comparison
How Guildford compares
Compared to Western Australia and national averages
| Metric | Guildford | WA Avg | National Avg |
|---|---|---|---|
| Hardness | 95 mg/L | 99.8 mg/L | 80.3 mg/L |
| pH | 8.23 | 7.9 | 7.8 |
| Fluoride | 0.84 mg/L | 0.7 mg/L | 0.7 mg/L |
| Turbidity | 0.1 NTU | 0.2 NTU | 0.4 NTU |
| TDS | 497 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 | 105 | mg/L CaCO3 | No limit | Measured |
| Aluminium | 0.008 | mg/L | < 0.2 | Good |
| Chloride | 172 | mg/L | < 250 | Good |
| Hardness | 95 | mg/L CaCO3 | < 200 | Good |
| Iron | 0.011 | mg/L | < 0.3 | Good |
| Manganese | 0.002 | mg/L | < 0.1 | Good |
| pH | 8.23 | pH units | 6.5 – 8.5 | Normal |
| Sodium | 114 | mg/L | < 180 | Good |
| Sulfate | 23 | mg/L | < 500 | Good |
| Total Dissolved Solids | 497 | mg/L | < 600 | Near limit |
| Colour | 1 | HU | < 15 | Good |
| Turbidity | 0.1 | NTU | < 5 | Good |
| Fluoride | 0.84 | mg/L | < 1.5 | Good |
| Nitrate | 0.9 | mg/L | < 50 | Good |
| Trihalomethanes | 0.114 | 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
Moderately hard (95 mg/L)
Water Hardness
Your water is moderately hard. You may notice light limescale deposits on kettle elements and taps over time. Soap lathers reasonably well, though slightly more product may be needed. Skin and hair are generally unaffected, and appliance lifespan should not be significantly reduced at this level.
Normal Range
pH Level
pH of 8.23 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 0.84 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 Guildford.
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
Guildford's water is moderately hard at 95 mg/L. You can use less soap and detergent, as it lathers easily with softer water.
Fluoride in Your Water
Fluoride measures 0.84 mg/L in Guildford. 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 497 mg/L. A reverse osmosis filter can reduce dissolved minerals if you prefer a cleaner taste in drinking water.
Get water quality alerts
We'll email you when Guildford's water data is updated.
FAQ
Frequently asked questions
Is tap water safe to drink in Guildford?
How hard is the water in Guildford?
What water utility supplies Guildford?
Does Guildford water have fluoride?
What is the water quality score for Guildford?
What is the population of Guildford?
Supplier
Water utility
- Utility
- Water Corporation
- Supply Zone
- Greenmount
- 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 8.0 and 10.0
Utility reports average the grid — not your home
Guildford'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 Guildford
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 Guildford, WA [Data set]. Compiled from Water Corporation data (2024-25 annual report). https://waterscore.com.au/water-quality/guildford-wa/
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Related
Explore more
Related pages for Guildford, WA
Is tap water safe?
Safety assessment
Water hardness
95 mg/L
Best water filter
Filter recommendations
Western Australia water quality
State coverage
Water Corporation
Water utility
Compare with Ashfield
Guildford vs Ashfield
Compare with Bassendean
Guildford vs Bassendean
Compare with Eden Hill
Guildford vs Eden Hill
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.