- !Australians buy 504 litres of bottled water per person per year (2021) — 5th highest in the world — despite some of the world’s most regulated tap water.
- ✗Bottled water costs ~2,000 times more per litre than tap water. Even a comprehensive RO system delivers filtered water at roughly 1/200th the cost of supermarket bottled water.
- ✗94% of Australian bottled water samples contain microplastics (avg 13/L in a 2022 study). Tap water generally contains far fewer. RO-filtered tap water contains effectively none.
- →Bottled water in Australia is regulated under FSANZ food standards — a different framework from the ADWG that governs tap water. Tap water requires more frequent testing and public reporting.
- ✓The main driver of bottled water purchases is taste. A $200–$400 under-sink carbon filter addresses chlorine taste — paying for itself in weeks compared to bottled water spending.
The cost comparison — the numbers that end the debate
Australia has one of the highest per-capita bottled water consumption rates in the world. According to the UN Global Bottled Water Industry report, Australians purchased an average of 504 litres of bottled water per person in 2021, making Australia fifth globally — despite having some of the most stringently regulated tap water in the world.
The cost difference between bottled water and filtered tap water is not marginal. It is enormous:
| Water source | Cost per litre | Annual cost for 2L/day | 10-year cost per person |
|---|---|---|---|
| Mains tap water (unfiltered) | <$0.001/L | <$1/year | <$10 |
| Filtered tap water (under-sink carbon) | ~$0.003–$0.01/L | $2–$7/year | $20–$70 |
| Filtered tap water (RO system) | ~$0.01–$0.05/L | $7–$36/year | $70–$360 |
| Bottled water (supermarket brand) | ~$0.80–$1.50/L | $580–$1,095/year | $5,800–$10,950 |
| Premium bottled water | ~$2–$4/L | $1,460–$2,920/year | $14,600–$29,200 |
Bottled water costs approximately 2,000 times more per litre than mains tap water. Even the most comprehensive home filtration system — an RO unit with annual cartridge costs — delivers water at roughly 1/200th the cost of supermarket bottled water.
Is bottled water safer than tap water in Australia?
This is the premise underlying most bottled water consumption decisions. The evidence does not support it.
Australian mains drinking water is regulated under the Australian Drinking Water Guidelines (ADWG), tested continuously by water utilities, and subject to independent regulatory oversight in each state and territory. Bottled water in Australia is regulated under the Food Standards Australia New Zealand (FSANZ) Food Standards Code — a different regulatory framework that does not require the same continuous testing frequency or public reporting.
A study conducted by Griffith University as part of the ABC’s War on Waste program tested popular Australian bottled water brands against Gold Coast tap water. The results: many brands were essentially treated tap water, with the consumer primarily paying for the bottle rather than higher-quality water.
A 2022 study found that 94% of bottled water samples tested in Australia contained microplastics, at an average concentration of 13 microplastics per litre. Mains tap water generally contains far fewer microplastics. RO-filtered tap water contains effectively none.
The environmental impact
The environmental cost of bottled water is substantially higher than tap water across every measured metric. A review published in the Royal Society of Victoria’s journal Science Victoria (2024) found that the environmental impacts of bottled water exceed those of tap water across all criteria:
- Energy: Producing bottled water requires up to 2,000 times more energy than treating and delivering tap water. The production of a 500ml PET bottle generates greenhouse gas emissions equivalent to approximately 3.87 kg CO₂.
- Water footprint: The water footprint ratio (fresh water used in production per unit of product) is 6–35 for bottled water, compared to 2.4 for tap water. Approximately 3 litres of water are consumed to produce 1 litre of bottled water.
- Plastic waste: Over 375 million plastic drinking bottles enter Australian landfill and waterways annually. PET bottles take 450–1,000 years to break down. Only approximately 13% of plastic in Australia is recovered.
- Transport emissions: Unlike tap water delivered through existing infrastructure, bottled water is transported from bottling plants to distributors to retailers to consumers — with every link adding carbon emissions.
Why Australians still buy bottled water — and what the evidence says
Research consistently identifies the primary driver of bottled water consumption as perceived safety and purity — a belief that bottled water is cleaner, purer or safer than tap water. This perception is systematically cultivated by bottled water marketing, which positions brands around imagery of mountain springs, purity and naturalness.
The perception gap is significant: in a country with some of the world’s best-regulated tap water, consumers pay 2,000 times more for a product that is less rigorously tested, often sourced from municipal water systems, and delivered in a plastic container that contributes microplastics to the product.
The second driver is taste — and this is legitimate. Many Australians, particularly in Perth and Adelaide where high chlorine or high mineral content affects flavour, genuinely prefer the taste of bottled water. This is the strongest case for home filtration: a $200–$400 under-sink carbon filter addresses chlorine taste more effectively than switching to bottled water, at approximately 1/100th the ongoing cost.
Filtered tap water vs bottled — the direct comparison
| Criteria | Bottled water | Filtered tap water |
|---|---|---|
| Cost per litre | $0.80–$4+ | $0.003–$0.05 |
| Regulatory oversight | FSANZ food code — less frequent testing | ADWG — continuous monitoring, public reporting |
| Microplastics | 94% of Australian samples contain microplastics (avg 13/L) | RO-filtered water: effectively zero. Carbon-filtered: similar to tap |
| Taste | Consistent (product-specific) | Equals or exceeds bottled water quality after carbon or RO filtration |
| Fluoride | Variable — many brands contain fluoride | Varies: carbon filters retain fluoride; RO removes 90–96% |
| Environmental impact | High across all metrics — plastic, transport, energy | Very low — uses existing infrastructure |
| Convenience | High for single-use | High once installed — filtered water at the tap |
| Heavy metals (lead etc) | Generally very low in reputable brands | NSF 53-certified filter: highly effective at lead removal |
The case for switching from bottled water to filtered tap water is overwhelming on cost, environmental impact, microplastics and regulatory scrutiny. A quality under-sink carbon filter addresses the main driver — taste — at approximately $200–$400 installed, with annual cartridge costs of $100–$200. At bottled water prices, this pays for itself within a few months.
If fluoride removal or comprehensive contaminant filtration is also a goal, an RO system addresses all concerns simultaneously at a fraction of the lifetime cost of bottled water. Use our comparison tool to find certified suppliers.