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PFAS Water Treatment
PFAS contamination has become a major water quality issue in Australia following legal action over PFAS-containing firefighting foam. This article explains what PFAS are, why water testing matters, and how technologies such as granular activated carbon, reverse osmosis and ion exchange may help reduce PFAS under the right conditions.
PFAS has become one of the most closely watched water contamination issues in Australia. Recent legal action involving PFAS-containing firefighting foam has brought “forever chemicals” back into public discussion, especially for communities, businesses and industrial sites concerned about water quality.
For many homeowners, facility managers, water treatment operators and business owners, the practical question is simple: can water treatment help reduce PFAS?
The answer is yes — but only under the right conditions. PFAS treatment is not the same as removing sediment, chlorine taste, odour or hardness. It requires water testing, careful technology selection, correct system design and ongoing maintenance.
The Australian Government has launched legal action against 3M, seeking more than A$2 billion in damages over PFAS contamination linked to firefighting foam used at Defence sites across Australia. The case has drawn attention not only because of the size of the claim, but also because it shows how complex and costly PFAS contamination can be to investigate, manage and remediate.
PFAS is not only a drinking water issue. It can involve firefighting foam storage areas, defence facilities, airports, industrial sites, contaminated soil, groundwater, surface water, wastewater and long-term environmental monitoring.
In New South Wales, PFAS investigations in the Blue Mountains have also shown how community concern can grow when PFAS is detected in water catchments. Public information from NSW authorities states that detailed investigations are underway, while recent monitoring has also indicated that Blue Mountains drinking water meets the updated Australian Drinking Water Guidelines and is considered safe to drink.
PFAS should not be treated as a simple “filter purchase” problem. It is a water quality, site history, treatment design and maintenance problem. The right approach depends on test data, water source, flow rate and the final use of the treated water.
For Australian homeowners, businesses and industrial users, the key takeaway is practical: PFAS requires informed assessment, not fear-based assumptions.
PFAS stands for per- and polyfluoroalkyl substances. They are a large group of synthetic chemicals that have been used for decades because they resist heat, oil, water and chemical degradation.
PFAS have historically been used in applications such as firefighting foams, non-stick coatings, water-resistant materials, stain-resistant textiles, industrial surfactants and some manufacturing processes.
Many PFAS compounds are often called “forever chemicals” because they break down very slowly in the environment. This means they can remain in soil, groundwater, surface water and sediments for long periods.
From a water treatment perspective, one of the most important points is that PFAS is not one single contaminant. Different PFAS compounds can behave differently, and treatment performance depends on the specific compounds present, their concentration and the surrounding water chemistry.
Many everyday water filters are designed for common water quality concerns such as dirt, rust, turbidity, chlorine taste, odour or hardness. These are important issues, but they are different from PFAS.
A standard sediment cartridge may help protect downstream equipment from particles, but it is not designed to treat dissolved PFAS compounds. A basic taste-and-odour filter may improve drinking water aesthetics, but that does not automatically mean it is suitable for PFAS reduction.
Do not choose a PFAS treatment approach based only on the filter name. Treatment performance depends on PFAS type, concentration, contact time, flow rate, media quality, water chemistry and system maintenance.
Several water treatment technologies may be used for PFAS reduction under suitable conditions. The most commonly discussed options include granular activated carbon, reverse osmosis membranes and ion exchange resin.
Granular activated carbon, often called GAC, can adsorb selected PFAS compounds when the system is designed with suitable carbon quality, bed depth, contact time and monitoring. It is commonly used in vessel-based water treatment systems and may be relevant for groundwater, process water, drinking water or site-specific applications.
Reverse osmosis, or RO, can reduce many dissolved contaminants, including certain PFAS compounds. RO may be used in point-of-use drinking water systems or larger engineered systems where broad dissolved contaminant reduction is required. However, RO systems also require suitable pre-treatment, pressure, membrane maintenance and consideration of the concentrate stream.
Specialised ion exchange resins may also be used for selected PFAS treatment applications. Resin selection should be based on test data, PFAS profile, competing ions, treatment target and operating conditions. Spent resin, regeneration strategy and breakthrough monitoring should also be considered.
Activated carbon, RO and ion exchange can all play a role in PFAS reduction, but they are not interchangeable. A small household drinking water system and a commercial groundwater treatment system require very different design thinking.
Before selecting a PFAS treatment system, water testing is essential. Without test data, it is difficult to know whether the selected treatment method is suitable, oversized, undersized or simply the wrong technology.
Testing helps identify which PFAS compounds are present, their concentration, and whether other water quality factors may affect treatment. It also helps determine whether the treatment objective is drinking water, process water, discharge, reuse, groundwater remediation or another application.
For domestic users, this may involve reviewing local water authority information and arranging laboratory testing if there is a specific concern. For commercial and industrial users, a more detailed water analysis is usually required before system selection or system design.
For home drinking water, PFAS treatment is usually focused on point-of-use drinking water systems, properly selected carbon filtration or reverse osmosis systems. Product claims, certifications, cartridge replacement and maintenance requirements should be checked carefully.
For commercial facilities, the treatment question may involve staff drinking water, food and beverage applications, process water, washdown water or a site-specific water quality concern. Flow rate, duty cycle, maintenance access and treatment target should be clearly defined.
For industrial and environmental applications, PFAS treatment can be much more complex. Groundwater remediation, landfill leachate, contaminated stormwater, process water and temporary treatment systems may require engineered treatment trains, pilot testing, monitoring and appropriate waste management.
One common mistake is assuming that any carbon filter is automatically suitable for PFAS. In reality, carbon type, contact time, bed depth, competing contaminants and monitoring all matter.
Another mistake is treating a sediment filter as a PFAS solution. Sediment filters are useful for particles and rust, but they are not designed to remove dissolved PFAS compounds.
Flow rate is also important. If water passes through treatment media too quickly, there may not be enough contact time for effective treatment. Maintenance is equally important because activated carbon, RO membranes and ion exchange resins all require monitoring, replacement or servicing.
The biggest mistake is skipping water testing. Without test data, the PFAS profile, treatment target and system requirements remain unknown.
Crystwater is an engineer-led water treatment supplier based in Australia. We support residential, commercial and industrial customers with water treatment consumables, replacement media and water treatment solutions.
For PFAS-related enquiries, the correct starting point is not simply choosing a filter name. The better approach is to understand the water source, test results, treatment objective and operating conditions, then select the most suitable treatment technology.
Depending on the application, a PFAS-related treatment approach may involve sediment pre-filtration, granular activated carbon, reverse osmosis, ion exchange resin or a combination of treatment steps. The final system should be selected based on water quality data, required flow rate, target water use and maintenance requirements.
If you are unsure which technology is suitable, start with the water quality data and treatment objective. From there, Crystwater can help you review practical options for water treatment consumables, replacement media or engineered system support. You can contact Crystwater to discuss your application.
Source note: This article references public reporting and public authority information from Reuters, NSW Government, WaterNSW and Sydney Water regarding PFAS contamination, the Australian Government’s legal action against 3M, and Blue Mountains PFAS investigations.
This article is general information only and should not be treated as laboratory, regulatory or engineering design advice for a specific PFAS contamination case.
PFAS contamination can be associated with firefighting foam use, defence facilities, airports, industrial areas, contaminated soil, groundwater movement and surface water catchments. This is why PFAS should be assessed as a water quality and site-specific treatment issue, not only as a household filter question.
Before selecting activated carbon, reverse osmosis or ion exchange, the water should be tested to understand which PFAS compounds are present, their concentration, the required flow rate, other water chemistry factors and the final use of the treated water.
Not necessarily. A standard sediment filter is not designed for PFAS treatment. PFAS reduction usually requires properly selected technologies such as activated carbon, reverse osmosis or ion exchange under suitable conditions.
Granular activated carbon can help reduce selected PFAS compounds when the system is designed with suitable media, contact time, bed depth and monitoring. Performance depends on the PFAS type and water chemistry.
Reverse osmosis can reduce many dissolved contaminants, including certain PFAS compounds. Performance depends on membrane condition, pressure, pre-treatment, system design and maintenance.
Specialised ion exchange resins may be suitable for selected PFAS treatment applications. Resin selection should be based on water testing, PFAS profile and treatment targets.
Yes. If PFAS contamination is suspected, water testing should come first. Testing identifies which compounds are present and helps determine the most suitable treatment approach.
No. PFAS can also involve groundwater, surface water, contaminated soil, industrial wastewater, site remediation and long-term monitoring.
