PFAS in Australian Drinking Water: What You Need to Know

What Are PFAS?

PFAS stands for per- and polyfluoroalkyl substances, a broad group of synthetic chemicals that have been used in manufacturing since the 1950s. They appear in a wide range of products: non-stick cookware, food packaging, waterproofing treatments for clothing and textiles, firefighting foam, and many industrial processes.

What makes PFAS significant from a water quality perspective is their persistence. These compounds do not break down in the environment or in the human body in the way most other chemicals do. The phrase "forever chemicals" reflects this: once PFAS enter a water system, soil, or organism, they tend to remain.

How PFAS Enter Drinking Water

The most common route into water supplies is through industrial discharge and the historic use of aqueous film-forming foam (AFFF), a type of firefighting foam that contains PFAS. This foam was used extensively at defence bases, airports, and fire training facilities across Australia, and can contaminate groundwater and surface water in surrounding areas over time.

Manufacturing facilities, landfill sites, and wastewater treatment plants are also potential sources. PFAS leach from products and waste into soil, and from soil into groundwater. Once they enter a water source, they are difficult to remove through conventional water treatment processes.

The PFAS Situation in Australia

Australian authorities have been investigating PFAS contamination in water supplies since the early 2010s. Areas near defence sites and airports have received particular scrutiny, and several communities near RAAF bases have been identified as having elevated PFAS levels in local water and bore water.

Town water supplies are generally subject to regular monitoring and testing. The Australian Drinking Water Guidelines include health-based guidance values for specific PFAS compounds. However, the science around PFAS health effects continues to develop, and guidance values have been revised in Australia and internationally as new research emerges.

If you rely on bore water, rainwater tanks, or a private water supply, the situation is different. These sources are typically not regulated or monitored in the same way, and contamination risk depends heavily on your location and proximity to potential sources.

What Are the Potential Health Concerns?

Research into PFAS health effects is ongoing. Studies have associated long-term PFAS exposure with a range of outcomes, including effects on immune function, thyroid hormone levels, cholesterol, and developmental outcomes in children. It is important to note that much of this research comes from occupationally exposed populations or communities near significant contamination sources, where exposures have been considerably higher than those found in general town water.

Australian health authorities have not declared town water unsafe to drink in most areas. That said, a precautionary approach to reducing PFAS exposure where it is practical to do so is reasonable, particularly for households with young children or during pregnancy. The Australian Government Department of Health publishes updated guidance on PFAS and its health implications.

Do Water Filters Reduce PFAS?

Yes, though not all filter types perform equally well.

Activated Carbon Filtration

Activated carbon is effective at reducing many PFAS compounds. The longer-chain PFAS variants (such as PFOA and PFOS, the two most studied) are relatively well-adsorbed by high-quality carbon media. Shorter-chain PFAS compounds, which have increasingly replaced the longer-chain variants in manufacturing, may be less consistently reduced by carbon alone.

A quality under-sink carbon system such as the filtered tap system provides effective reduction of PFAS alongside chlorine, heavy metals, and sediment. It is a practical and cost-effective approach for households wanting to reduce PFAS from their drinking water without the investment of a full reverse osmosis setup.

Reverse Osmosis Filtration

Reverse osmosis provides more comprehensive PFAS reduction than carbon filtration alone. The semi-permeable membrane in an RO system physically blocks dissolved contaminants, including both long-chain and short-chain PFAS compounds, rather than relying on adsorption. For households with a higher level of concern about PFAS, or those located near identified contamination sources, an under-sink reverse osmosis system is the more thorough option.

RO also addresses fluoride, nitrates, heavy metals, and a broad range of other dissolved solids, making it a comprehensive water treatment option for households that want high-purity drinking water across the board. If fluoride removal is also a priority for your household, our guide on whether water filters remove fluoride covers which technologies are effective and which are not.

What Does Not Help

Boiling water does not remove PFAS. Standard sediment filters and simple pitcher filters are not reliable for PFAS reduction. If a filter product does not specifically list PFAS among its tested and certified contaminant reductions, do not assume it provides coverage.

What Certifications Should You Look For?

When evaluating a water filter for PFAS reduction, look for independent third-party testing and certification. NSF/ANSI Standard 58 covers reverse osmosis systems and includes testing for PFAS compounds such as PFOA and PFOS. NSF/ANSI Standard 53 covers certain contaminant reduction claims for activated carbon-based systems.

A manufacturer's claim that a filter reduces PFAS without independent certification to back it up is not a reliable basis for a purchasing decision. Filter performance in real-world conditions depends on factors including water chemistry, flow rate, and temperature, which is why standardised third-party testing exists.

Australian water filter products may also carry WaterMark certification. This relates to plumbing product safety rather than contaminant reduction performance, so the two are separate considerations. A WaterMark-certified product does not automatically mean it is certified for PFAS reduction. Check the specific contaminant reduction claims and the test standards they reference before purchasing.

When in doubt, ask the supplier to provide the independent test report for the specific contaminants you are concerned about. A reputable supplier should be able to produce this without hesitation.

How to Find Out About PFAS in Your Local Water

Your first resource is your water utility's annual water quality report. Most town water suppliers in Australia test for a range of PFAS compounds and publish results. If PFAS are detected but remain below guideline values, the water is considered safe to drink under current Australian standards.

If you are on bore water, tank water, or a private supply in an area with known industrial or defence activity nearby, independent testing through an accredited laboratory is worth considering. Testing gives you a clear picture of what is actually present in your specific supply rather than relying on general guidance.

The National Health and Medical Research Council and the Australian Government Department of Health publish updated guidance on PFAS and drinking water. These are useful starting points if you want to understand the current regulatory position and health thresholds in more detail.

Is Whole-of-House Filtration Necessary?

For most households, point-of-use filtration at the kitchen tap is the practical approach. PFAS exposure through drinking water and cooking water represents the primary route of concern for most people. Shower and bath water is a lower-priority pathway.

A high-quality under-sink filter or reverse osmosis system at the kitchen tap addresses the most relevant exposure pathway without the cost and complexity of a whole-house installation. It is the right starting point for the large majority of households.

Taking Action

If you are concerned about PFAS in your drinking water, the steps are straightforward:

1. Check your utility's water quality report for PFAS testing results and compare them against current Australian guideline values.
2. If you are on a private water supply, arrange independent testing through an accredited laboratory.
3. Consider a quality point-of-use filter matched to your level of concern: activated carbon for practical PFAS reduction at lower cost, or reverse osmosis for more comprehensive coverage across a wider range of contaminants.
4. Replace filter cartridges or membranes on schedule. An expired or clogged filter provides reduced protection and should not be left in place beyond its service life.

The science around PFAS continues to develop, and health guidance values may be revised as new research becomes available. Taking reasonable precautions now is a sensible position, regardless of whether your current supply sits within current guideline limits.

It is also worth being realistic about what filtration can and cannot do. A point-of-use filter at the kitchen tap reduces PFAS in the water you drink and cook with. It does not address PFAS exposure from other sources such as food packaging, cookware, or other products. Reducing drinking water exposure is a meaningful and practical step; treating it as a complete solution to PFAS exposure more broadly would be an overstatement of what any filtration system can achieve.

PFAS is one of several contaminants detected in Australian water supplies that standard filters address poorly. Microplastics are another. Our post on microplastics in Australian tap water covers the latest research and which filter types are effective for particle removal. For a direct comparison of carbon versus RO performance across all major contaminants, see our guide to carbon filtration versus reverse osmosis.

Summary

PFAS are persistent synthetic chemicals found in varying concentrations in some Australian water supplies. Town water is generally monitored and regulated, but private supplies carry more uncertainty depending on location. Activated carbon filtration reduces many PFAS compounds effectively. Reverse osmosis provides more comprehensive coverage across a broader range of PFAS variants. For most households, a point-of-use filter at the kitchen tap is the most practical first step.

If you have questions about which filtration system suits your situation, contact the Purest Solutions team. We can help you assess your options and find a solution that fits your household and your water quality concerns.