Tap Water Quality in Kearns, NSW
Postcode 2558 · Supplied by Sydney Water via Macarthur
Quality Score
About Kearns
Kearns is a suburb of 2,693 residents in New South Wales (postcode 2558). The median age is 36. It falls within the Sydney Water area. Neighbouring suburbs include Eschol Park, Eagle Vale, Claymore, Blairmount.
Most residents own their home with a mortgage (56%), while 27% own outright, while 15% rent. The median household income is $111,644 per year. The top countries of birth for residents are United Kingdom (14%), Philippines (8%), and New Zealand (7%).
Tap water in Kearns is supplied by Sydney Water. The suburb receives water via the Macarthur supply zone.
Water quality summary
Based on 2024-25 water quality reports, Kearns achieves a WaterScore of 9.6 out of 10, rated excellent overall. Water hardness measures 34.9 mg/L, classified as soft. This is gentle on appliances and skin, with minimal limescale buildup expected. The pH level is 7.6, which is within the ADWG guideline range of 6.5–8.5. The water is fluoridated at 1.05 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. Chlorine, used for disinfection, measures 0.74 mg/L — well within the ADWG guideline of 5 mg/L. Some residents may notice a slight taste, which can be reduced by refrigerating water or using a carbon filter. Total dissolved solids (TDS) measure 126.3 mg/L, considered low against the ADWG guideline of 600 mg/L. Turbidity is 0.1 NTU, indicating clear water, within the ADWG guideline of 5 NTU. E. coli was not detected in testing, meeting the ADWG standard for microbiological safety.
Compare with nearby suburbs: Eschol Park , Eagle Vale , Claymore
Census Data
Suburb snapshot
Population
Median Age
Median Income
Owner-occupied
Recommended filters for Kearns
Products matched to your water profile
ZeroWater
2.8L 5-Stage Jug (IAPMO Certified: PFOA/PFOS + Lead)
4.2 · 5,315 ratings on Amazon
Ideal for Kearns — removes fluoride (currently 1.05 mg/L).
iSpring
RCC7AK 6-Stage Under-Sink RO (with Alkaline Re-min)
4.6 · 13,756 ratings on Amazon
Ideal for Kearns — removes fluoride (currently 1.05 mg/L), removes chlorine taste and odour.
Waterdrop
TSA Under-Sink Carbon Filter (Chlorine + Taste)
4.4 · 2,237 ratings on Amazon
Ideal for Kearns — removes chlorine taste and odour.
Comparison
How Kearns compares
Compared to New South Wales and national averages
| Metric | Kearns | NSW Avg | National Avg |
|---|---|---|---|
| Hardness | 34.9 mg/L | 45.9 mg/L | 85.3 mg/L |
| pH | 7.6 | 7.7 | 7.8 |
| Fluoride | 1.05 mg/L | 1 mg/L | 0.7 mg/L |
| Chlorine | 0.74 mg/L | — | — |
| Turbidity | 0.1 NTU | 0.2 NTU | 0.4 NTU |
| TDS | 126.3 mg/L | 116.3 mg/L | 275.7 mg/L |
Full Results
Detailed water quality data
All values compared against Australian Drinking Water Guidelines (ADWG)
| Parameter | Value | Unit | ADWG Guideline | Status |
|---|---|---|---|---|
| Iron | 0.011 | mg/L | < 0.3 | Good |
| Aluminium | 0.034 | mg/L | < 0.2 | Good |
| Manganese | 0.0005 | mg/L | < 0.1 | Good |
| Copper | 0.007 | mg/L | < 2 | Good |
| Zinc | 0.002 | mg/L | No limit | Measured |
| Ammonia | 0.235 | mg/L | No limit | Measured |
| Turbidity | 0.1 | NTU | < 5 | Good |
| Colour | 2 | HU | < 15 | Good |
| Dissolved Oxygen | 99.4 | % saturation | No limit | Measured |
| Total Dissolved Solids | 126.3 | mg/L | < 600 | Good |
| Sulfate | 2.5 | mg/L | < 500 | Good |
| Hardness | 34.9 | mg/L | < 200 | Good |
| pH | 7.6 | pH units | 6.5 – 8.5 | Normal |
| Temperature | 20 | degrees C | No limit | Measured |
| E. coli | 0 | orgs/100 mL | < 0 | Compliant |
| Free Chlorine | 0.74 | mg/L | < 5 | Good |
| Monochloramine | 0.93 | mg/L | < 3 | Good |
| Fluoride | 1.05 | mg/L | < 1.5 | Good |
| Trihalomethanes | 0.05 | mg/L | < 0.25 | Good |
| Ndma | 0.0001 | mg/L | No limit | Measured |
| Chloride | 0.004 | mg/L | < 250 | Good |
| PFOS + PFHxS | 0.0007 | µg/L | PFOS < 0.008, PFHxS < 0.03 | Good |
| PFOA | 0.0001 | µg/L | < 0.2 | Good |
Safety
Safety assessment
Based on 23 parameters tested, all results fall within Australian Drinking Water Guidelines. E. coli was not detected, meeting the ADWG standard for microbiological safety.
Based on comparison with Australian Drinking Water Guidelines (ADWG)
Explained
What these numbers mean
Soft (34.9 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 7.6 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 1.05 mg/L. Within the recommended 0.6–1.1 mg/L range for dental health.
Chlorine
Disinfection
Chlorine measured at 0.74 mg/L, well within the ADWG guideline of 5 mg/L. Used for disinfection to keep water safe. May affect taste slightly — refrigerating water or using a carbon filter can help.
Learn more about these measurements in our water quality glossary — including Hardness , pH , Fluoride , and ADWG guidelines .
Advice
Practical tips for residents
Chlorine Levels Are Low
Chlorine in Kearns measures 0.74 mg/L, which is low. Filling a jug and letting it stand for 30 minutes will reduce any residual taste.
Soft Water Advantage
Kearns's water is soft at 34.9 mg/L. You can use less soap and detergent, as it lathers easily with softer water.
Fluoride in Your Water
Fluoride measures 1.05 mg/L in Kearns. Australian guidelines allow up to 1.5 mg/L. This is added by utilities to support dental health in the community.
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FAQ
Frequently asked questions
Is tap water safe to drink in Kearns?
How hard is the water in Kearns?
What water utility supplies Kearns?
Does Kearns water have fluoride?
What is the water quality score for Kearns?
What is the population of Kearns?
Supplier
Water utility
- Utility
- Sydney Water
- Supply Zone
- Macarthur
- Data Source
- Sydney Water — quarterly macarthur q2 202425, quarterly macarthur q3 202425, quarterly macarthur q4 202425
Nearby
Nearby suburbs
Same water utility, similar water quality
Similar Quality
Suburbs with similar water quality
Suburbs scoring between 8.6 and 10.0
Utility reports average the grid — not your home
Kearns'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 Sydney
In-depth articles on the water supply that serves Kearns
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 Kearns, NSW [Data set]. Compiled from Sydney Water data (2024-25 annual report). https://waterscore.com.au/water-quality/kearns-nsw/
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Related
Explore more
Related pages for Kearns, NSW
Is tap water safe?
Safety assessment
Water hardness
34.9 mg/L
Best water filter
Filter recommendations
New South Wales water quality
State coverage
Sydney Water
Water utility
Compare with Eschol Park
Kearns vs Eschol Park
Compare with Eagle Vale
Kearns vs Eagle Vale
Compare with Claymore
Kearns vs Claymore
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 Sydney Water (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.