Aesthetic quality matters
The Australian Drinking Water Guidelines distinguish health-based criteria from aesthetic characteristics such as taste, odour and appearance. A noticeable taste or smell can be unpleasant without automatically meaning the water is unsafe.
Chlorine is one common example: NHMRC notes an odour threshold around 0.6 mg/L, and some people are able to detect lower concentrations.
Possible causes
- Disinfectant residual such as chlorine.
- Mineral content or hardness.
- Stagnation in internal plumbing.
- Hot-water-system effects.
- Network maintenance or temporary changes.
- Private tanks, rainwater systems or property-specific plumbing.
Start with pattern and location
Ask whether the issue is at every tap or one tap, cold water or hot water, constant or intermittent, and whether neighbours notice the same thing. Those observations help distinguish a whole-supply characteristic from an internal plumbing issue.
If there is a sudden, strong or unusual change in taste, odour or colour, contact the water supplier or a licensed plumber rather than assuming a filter is the first response.
Where carbon filtration fits
Activated carbon is commonly used for chlorine taste and odour treatment and can also adsorb some organic compounds. The relevant filter choice depends on what is actually causing the taste or smell.
Sources and last reviewed
Last reviewed: September 2026.
This article is general educational information and does not replace water testing, utility advice, plumbing advice or health advice for a specific circumstance.
