Yes. Central Coast tap water is safe to drink. Central Coast Council tests it against the Australian Drinking Water Guidelines and publishes the results every quarter, and the health results sit well inside the limits.
Safe and pleasant are two different things, though. Most of the questions we hear from customers are about taste, smell and colour, not safety. So here is what is actually in the water, using Council’s own numbers.
Where does Central Coast water come from?
Council runs the third largest urban water supply in NSW, after Sydney and the Hunter. According to its drinking water quality page, water is drawn from local rivers, creeks and dams, then filtered and disinfected at plants in Somersby and Mardi. From there it travels through more than 2,200 kilometres of pipe to about 120,000 properties.
That distance matters. What comes out of your tap depends partly on how far you are from the plant, and partly on the pipes inside your own home.
What does Council’s testing show?
These figures are from Council’s quarterly drinking water summary for April to June 2025.
| What was tested | Average result | Highest result | Guideline limit |
|---|---|---|---|
| E. coli (230 samples) | None detected | None detected | None |
| Total chlorine | 1.47 mg/L | 3.70 mg/L | 5 mg/L |
| Fluoride | 0.59 mg/L | 0.88 mg/L | 1.5 mg/L |
| Lead | 0.0004 mg/L | 0.0008 mg/L | 0.01 mg/L |
| Copper | 0.026 mg/L | 0.048 mg/L | 2 mg/L |
| Total hardness | 53 mg/L | 64 mg/L | 200 mg/L |
| pH | 7.4 | 8.2 | 6.5 to 8.5 |
| PFOS (PFAS) | Below 0.001 µg/L | Below 0.001 µg/L | 0.008 µg/L |
| PFHxS (PFAS) | Below 0.001 µg/L | Below 0.001 µg/L | 0.03 µg/L |
| PFOA (PFAS) | Below 0.001 µg/L | Below 0.001 µg/L | 0.2 µg/L |
Every row is inside its guideline. The PFAS limits shown are the current national values, which were tightened in July 2025, and the results sit below even those. Council publishes a new summary every quarter on its drinking water quality page.
Why does my tap water taste or smell like chlorine?
Because chlorine is added on purpose. It kills bacteria and keeps the water safe on its way to you, so a small amount is meant to still be there when it reaches your tap.
How much you notice depends on where you live. Council says seasonal demand, your distance from the treatment plant and changes in how the system is run all affect the chlorine level at your tap. That is why one suburb can taste it and the next one can’t.
Council’s own tip is to fill a covered jug, leave it in the fridge and drink it within 24 hours. A carbon water filter does the same job straight from the tap.
Is there fluoride in Central Coast water?
Yes. The supply is fluoridated in line with NSW Health recommendations. In the April to June 2025 results, fluoride averaged 0.59 mg/L against a guideline limit of 1.5 mg/L.
If you would rather not have it, know that boiling does not remove fluoride and neither does a standard carbon filter. Reverse osmosis is the filter type that does.
Is there PFAS in Central Coast drinking water?
Council tests treated drinking water for PFAS every quarter. Its PFAS page says all treated water samples have shown no PFAS, or only very low levels, well below the guideline values.
Council has been upfront that some untreated source water in parts of the catchments has tested above the guidelines. It says levels were well below the guidelines at the points where water is extracted, and that it is working with NSW Health on those catchments.
The national guideline values were tightened in July 2025. Council states the supply remains compliant.
Is Central Coast water hard or soft?
Soft. Council describes the supply as soft or moderately soft, and total hardness averaged 53 mg/L against a guideline of 200 mg/L.
In practical terms, you do not need a water softener on town water here. If someone is trying to sell you one, ask why.
Why is my tap water brown or cloudy?
Council says yellow, brown or black water is usually natural iron and manganese stirred up in the mains. Milky white water is usually trapped air, and it clears from the bottom of the glass up.
Discolouration is more common in summer, in low lying areas and in dead end streets. Past runs of brown water have been reported in suburbs including Gosford, Narara, Wyoming and Woy Woy.
If it keeps happening at your place and not your neighbour’s, the cause may be your own pipes. Council notes that galvanised pipes, usually found in homes built before the mid 1960s, rust from the inside as they age. Our guide to the signs your home needs replumbing covers what to look for.
What happened with the Terrigal boil water alert?
On the evening of 4 February 2025, Council issued a precautionary boil water alert after a routine sample from the Terrigal reservoir supply system showed a possible presence of E. coli. It covered nine suburbs, including Terrigal, Erina, Kincumber and Avoca Beach. An independent laboratory confirmed no E. coli the next day, and Council lifted the alert on the afternoon of 5 February.
It is a fair reminder that the monitoring works: a single unusual result was caught, announced and cleared in under 24 hours.
Can my own plumbing affect water quality?
Yes. Council is clear that water quality can change once it enters the plumbing on private property. The three most common causes are:
- Old galvanised pipes that rust internally and add a metallic taste.
- Rainwater tanks topped up from mains without backflow prevention, which can let tank water flow back into the drinking supply.
- Neglected water filters. Cartridges that are not changed on schedule can grow bacteria.
Do you need a water filter on the Central Coast?
Not for safety. The water meets the guidelines without one.
A filter is worth considering if:
- you can taste or smell chlorine and it puts you off drinking tap water
- you want fluoride or PFAS reduced as far as possible
- you get sediment or discolouration often
- you are buying bottled water every week to avoid the tap
One more warning from Council: be wary of cold callers offering free water tests and selling filtration units. They are not from Council.
Not sure which type suits your home? Read our comparison of whole house vs under sink water filters, or see our water filtration systems service. Our plumbers across the Central Coast can also check your pipes and tell you what is actually affecting your water. Call 0414 259 179 or get in touch with Miracle Plumbing.
Quick answers
Is Central Coast tap water safe to drink? Yes. Council tests it against the Australian Drinking Water Guidelines and publishes results each quarter.
Does Central Coast water have fluoride? Yes. It averaged 0.59 mg/L in the April to June 2025 results, against a guideline limit of 1.5 mg/L.
Is Central Coast water hard? No. It is soft, averaging 53 mg/L total hardness.
Does boiling water remove chlorine or fluoride? Leaving water to stand in the fridge reduces the chlorine taste. Boiling does not remove fluoride.
Who do I call about water quality on the Central Coast? Central Coast Council, 24 hours a day, on 02 4306 7900.
