Tap Water Quality in Illawong, NSW
Postcode 2234 · Supplied by Sydney Water via Woronora
Quality Score
About Illawong
Illawong is a suburb of 7,427 residents in New South Wales (postcode 2234). The median age is 44. It falls within the Sydney Water area. Neighbouring suburbs include Bonnet Bay, Bangor, Alfords Point, Woronora.
Most residents own outright (50%), while 41% own their home with a mortgage, while 8% rent. The median household income is $144,456 per year. The top countries of birth for residents are United Kingdom (13%), China (10%), and Lebanon (9%).
Tap water in Illawong is supplied by Sydney Water. The suburb receives water via the Woronora supply zone.
Water quality summary
Based on 2024-25 water quality reports, Illawong achieves a WaterScore of 9.5 out of 10, rated excellent overall. Water hardness measures 37.4 mg/L, classified as soft. This is gentle on appliances and skin, with minimal limescale buildup expected. The pH level is 7.7, 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 0.04 mg/L — well within the ADWG guideline of 5 mg/L. Total dissolved solids (TDS) measure 106.3 mg/L, considered low against the ADWG guideline of 600 mg/L. Turbidity is 0.11 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: Bonnet Bay , Bangor , Alfords Point
Census Data
Suburb snapshot
Population
Median Age
Median Income
Owner-occupied
Recommended filters for Illawong
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 Illawong — removes fluoride (currently 1.05 mg/L).
Geekpure
5-Stage Under-Sink RO (75 GPD)
4.4 · 400 ratings on Amazon
Ideal for Illawong — removes fluoride (currently 1.05 mg/L).
Purewell
8.5L Stainless Steel Gravity System
4.4 · 1,137 ratings on Amazon
A reliable 8.5l stainless steel gravity system suitable for Illawong's water profile.
Comparison
How Illawong compares
Compared to New South Wales and national averages
| Metric | Illawong | NSW Avg | National Avg |
|---|---|---|---|
| Hardness | 37.4 mg/L | 45.9 mg/L | 85.3 mg/L |
| pH | 7.7 | 7.7 | 7.8 |
| Fluoride | 1.05 mg/L | 1 mg/L | 0.7 mg/L |
| Chlorine | 0.04 mg/L | — | — |
| Turbidity | 0.11 NTU | 0.2 NTU | 0.4 NTU |
| TDS | 106.3 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 | 0.005 | mg/L | < 0.3 | Good |
| Aluminium | 0.07 | mg/L | < 0.2 | Good |
| Manganese | 0.0008 | mg/L | < 0.1 | Good |
| Copper | 0.01 | mg/L | < 2 | Good |
| Zinc | 0.003 | mg/L | No limit | Measured |
| Ammonia | 0.285 | mg/L | No limit | Measured |
| Turbidity | 0.11 | NTU | < 5 | Good |
| Colour | 2 | HU | < 15 | Good |
| Dissolved Oxygen | 107 | % saturation | No limit | Measured |
| Total Dissolved Solids | 106.3 | mg/L | < 600 | Good |
| Sulfate | 3.1 | mg/L | < 500 | Good |
| Hardness | 37.4 | mg/L | < 200 | Good |
| pH | 7.7 | pH units | 6.5 – 8.5 | Normal |
| Temperature | 20.1 | degrees C | No limit | Measured |
| E. coli | 0 | orgs/100 mL | < 0 | Compliant |
| Free Chlorine | 0.04 | mg/L | < 5 | Good |
| Monochloramine | 1.97 | mg/L | < 3 | Good |
| Fluoride | 1.05 | mg/L | < 1.5 | Good |
| Trihalomethanes | 0.07 | mg/L | < 0.25 | Good |
| Ndma | 0.0001 | mg/L | No limit | Measured |
| Chloride | 0.004 | mg/L | < 250 | Good |
| PFOS + PFHxS | 0.0001 | 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 (37.4 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 7.7 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 0.04 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 Illawong measures 0.04 mg/L, which is low. Filling a jug and letting it stand for 30 minutes will reduce any residual taste.
Soft Water Advantage
Illawong's water is soft at 37.4 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 Illawong. 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 Illawong?
How hard is the water in Illawong?
What water utility supplies Illawong?
Does Illawong water have fluoride?
What is the water quality score for Illawong?
What is the population of Illawong?
Supplier
Water utility
- Utility
- Sydney Water
- Supply Zone
- Woronora
- Data Source
- Sydney Water — quarterly woronora q2 202425, quarterly woronora q3 202425, quarterly woronora q4 202425
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
Illawong'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 Illawong
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 Illawong, NSW [Data set]. Compiled from Sydney Water data (2024-25 annual report). https://waterscore.com.au/water-quality/illawong-nsw/
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Related
Explore more
Related pages for Illawong, NSW
Is tap water safe?
Safety assessment
Water hardness
37.4 mg/L
Best water filter
Filter recommendations
New South Wales water quality
State coverage
Sydney Water
Water utility
Compare with Bonnet Bay
Illawong vs Bonnet Bay
Compare with Bangor
Illawong vs Bangor
Compare with Alfords Point
Illawong vs Alfords Point
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.
