Tap Water Quality in Coles Bay, TAS
Postcode 7215 · Supplied by TasWater via Coles Bay
Quality Score
About Coles Bay
Coles Bay is a suburb of 515 residents in Tasmania (postcode 7215). The median age is 38. It falls within the TasWater area. Neighbouring suburbs include Swansea, Bicheno, Beaumaris, Chain Of Lagoons.
Most residents own outright (43%), while 35% rent, while 21% own their home with a mortgage. The median household income is $70,408 per year. The top countries of birth for residents are Nepal (37%), United Kingdom (13%), and United States (5%).
Tap water in Coles Bay is supplied by TasWater. The suburb receives water via the Coles Bay supply zone.
Water quality summary
Based on recent water quality reports, Coles Bay achieves a WaterScore of 9.4 out of 10, rated excellent overall. Water hardness measures 56.142857 mg/L, classified as soft. This is gentle on appliances and skin, with minimal limescale buildup expected. The pH level is 7.432419, which is within the ADWG guideline range of 6.5–8.5. Chlorine, used for disinfection, measures 0.776129 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 417.142857 mg/L, considered moderate against the ADWG guideline of 600 mg/L. Turbidity is 0.386129 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.
Census Data
Suburb snapshot
Population
Median Age
Median Income
Owner-occupied
Recommended filters for Coles Bay
Products matched to your water profile
BRITA
Marella 2.4L Fridge Water Filter Jug (Maxtra+)
4.7 · 16,095 ratings on Amazon
Ideal for Coles Bay — removes chlorine taste and odour.
ZeroWater
23-Cup Dispenser (incl. TDS Meter)
4.3 · 27,123 ratings on Amazon
A reliable 23-cup dispenser (incl. tds meter) suitable for Coles Bay's water profile.
Purewell
8.5L Stainless Steel Gravity System
4.4 · 1,137 ratings on Amazon
Ideal for Coles Bay — removes chlorine taste and odour.
Comparison
How Coles Bay compares
Compared to Tasmania and national averages
| Metric | Coles Bay | TAS Avg | National Avg |
|---|---|---|---|
| Hardness | 56.142857 mg/L | 34.8 mg/L | 85.1 mg/L |
| pH | 7.432419 | 7.4 | 8.4 |
| Fluoride | — | 0.9 mg/L | 0.7 mg/L |
| Chlorine | 0.776129 mg/L | — | — |
| Turbidity | 0.386129 NTU | 0.3 NTU | 0.4 NTU |
| TDS | 417.142857 mg/L | 93.3 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 |
|---|---|---|---|---|
| Alkalinity | 45.857143 | mg/L | No limit | Measured |
| Aluminium | 0.053929 | mg/L | < 0.2 | Good |
| Ammonia | 0.002 | mg/L | No limit | Measured |
| Antimony | 0.001 | mg/L | No limit | Measured |
| Arsenic | 0.001 | mg/L | No limit | Measured |
| Cadmium | 0.0002 | mg/L | No limit | Measured |
| Calcium | 4.542857 | mg/L | No limit | Measured |
| Chloride | 160 | mg/L | < 250 | Good |
| Free Chlorine | 0.776129 | mg/L | < 5 | Good |
| Total Chlorine | 0.855833 | mg/L | < 5 | Good |
| Chromium | 0.001 | mg/L | No limit | Measured |
| Colour | 2.285714 | Pt-Co | < 15 | Good |
| Conductivity | 796.428571 | uS/cm | No limit | Measured |
| Copper | 0.003571 | mg/L | < 2 | Good |
| Cyanide | 0.005 | mg/L | No limit | Measured |
| E. coli | 0 | MPN/100ml | < 0 | Compliant |
| Hardness | 56.142857 | mg/L | < 200 | Good |
| Iron | 0.019643 | mg/L | < 0.3 | Good |
| Lead | 0.00125 | mg/L | < 0.01 | Good |
| Magnesium | 10.814286 | mg/L | No limit | Measured |
| Manganese | 0.001286 | mg/L | < 0.1 | Good |
| Mercury | 0.0001 | mg/L | No limit | Measured |
| Nickel | 0.001 | mg/L | No limit | Measured |
| Nitrate | 0.004786 | mg/L | < 50 | Good |
| Nitrite | 0.002 | mg/L | No limit | Measured |
| pH | 7.432419 | pH units | 6.5 – 8.5 | Normal |
| Sodium | 125 | mg/L | < 180 | Good |
| Sulfate | 100.714286 | mg/L | < 500 | Good |
| Temperature | 15.829032 | degrees C | No limit | Measured |
| Total Coliforms | 0 | MPN/100ml | < 0 | Compliant |
| Total Dissolved Solids | 417.142857 | mg/L | < 600 | Good |
| Trihalomethanes | 0.091643 | mg/L | < 0.25 | Good |
| Turbidity | 0.386129 | NTU | < 5 | Good |
| Zinc | 0.010714 | mg/L | No limit | Measured |
Safety
Safety assessment
Based on 34 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 (56.142857 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 7.432419 is within the ideal range of 6.5–8.5. The ADWG recommends pH between 6.5 and 8.5 for drinking water.
Data unavailable
Fluoride
Fluoride data is not currently available for Coles Bay.
Chlorine
Disinfection
Chlorine measured at 0.776129 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 Coles Bay measures 0.776129 mg/L, which is low. Filling a jug and letting it stand for 30 minutes will reduce any residual taste.
Soft Water Advantage
Coles Bay's water is soft at 56.142857 mg/L. You can use less soap and detergent, as it lathers easily with softer water.
Consider a Filter for TDS
Total dissolved solids measure 417.142857 mg/L. A reverse osmosis filter can reduce dissolved minerals if you prefer a cleaner taste in drinking water.
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FAQ
Frequently asked questions
Is tap water safe to drink in Coles Bay?
How hard is the water in Coles Bay?
What water utility supplies Coles Bay?
Does Coles Bay water have fluoride?
What is the water quality score for Coles Bay?
What is the population of Coles Bay?
Supplier
Water utility
- Utility
- TasWater
- Supply Zone
- Coles Bay
- Data Source
- TasWater — Coles Bay
Nearby
Nearby suburbs
Same water utility, similar water quality
Similar Quality
Suburbs with similar water quality
Suburbs scoring between 8.4 and 10.0
Utility reports average the grid — not your home
Coles Bay'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 Hobart and Tasmania
In-depth articles on the water supply that serves Coles Bay
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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 TasWater (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.