PFAS in Drinking Water: Treatment Guide

PFAS in drinking water should be handled from laboratory evidence, not taste or odour. For Indonesian projects, define the named PFAS analytes, method, action limit, and sampling locations first, then select GAC, PFAS-selective anion resin, RO, or a combined treatment train with outlet verification and a plan for spent media or concentrate.

Clean water is a very important basic human need.

pfas diagrams

Short answer: PFAS treatment cannot be selected by media name alone. Test the water, distinguish long- and short-chain PFAS, then choose GAC, PFAS-selective anion resin, or RO by outlet target, flow, and residuals management. Prove performance by sampling the inlet, inter-vessel point, and outlet—not by taste, odor, or filter age.

Technical update: 8 August 2026. The original publication date is unchanged.

As an international reference, the current U.S. EPA PFAS drinking-water rule still lists 4.0 ng/L MCLs for PFOA and PFOS. EPA announced two proposed rule changes on 18 May 2026 concerning timing and other PFAS; proposals are not final rules. These U.S. values do not replace Indonesian requirements. For an Indonesian project, use Ministry of Health Regulation No. 2 of 2023 as the drinking-water-quality framework and agree the PFAS analytes, methods, and action limits explicitly with the relevant authority and laboratory.

PFAS Treatment Decision Matrix for Homes, Buildings, and Commercial Outlets

A defensible PFAS decision starts from test results and the point of use. A home faucet, hotel pantry, refill outlet, or apartment building can require a different configuration because flow, maintenance ownership, and residuals handling are different.

Scenario	Minimum data before design	Initial treatment option	Verification point	Risk note
Home faucet or small pantry	Target PFAS, TDS, hardness, chlorine, peak flow, under-sink space	POU RO with a certified PFAS-reduction claim, or carbon/anion cartridge if the claim matches the result	Feed and outlet after commissioning; repeat by cartridge capacity	RO creates reject water; cartridges must be replaced from capacity or testing, not taste
Hotel, restaurant, or coffee shop	Target PFAS, TOC, turbidity, chlorine/chloramine, flow at each critical outlet	POU RO for selected drinking outlets; carbon/UF for taste and particles where PFAS is not the main target	Drinking outlet, ice machine, espresso, and after-treatment point	Do not call water ready to drink without sanitation, consumable logs, and laboratory tests
Building or apartment	Target PFAS, peak flow, daily volume, TOC, hardness, pressure, drain	Lead-lag GAC or PFAS-selective anion resin; central RO only when concentrate and scaling are controlled	Inlet, inter-vessel, final outlet; permeate/concentrate for RO	Provide sample ports in the design; plan spent-media disposal
Commercial refill operation	Target PFAS, full chemistry panel, microbiology, production capacity, product standard	Pretreatment + RO/NF where dissolved-contaminant targets are broad; carbon polishing where supported by testing	Raw water, permeate, tank, filler, and product sample	Requires sanitation SOP, commissioning, and periodic verification for drinking-water standards

For commercial components, PT Watermart Perkasa can help match test results to reverse osmosis membranes, activated carbon media, and ion exchange resin. If PFAS is not the only target, include microbiology, Fe/Mn, hardness, TDS, and Indonesian Ministry of Health parameters so the design does not solve one problem while missing another risk.

Sampling, carbon, RO, and media-change decision table

An auditable PFAS decision connects each sample result to a design action. Keep the same units used by the laboratory, usually ng/L, and do not collapse the results into “total PFAS” when the action limit is set for named compounds.

Sample finding	Initial treatment decision	Evidence before acceptance	Replacement or investigation trigger
PFOA/PFOS or long-chain PFAS dominate, with low-to-moderate TOC	Lead-lag GAC with EBCT and bed volume calculated from peak flow	S0, S1, S2 after commissioning; pressure loss; treated volume	Rising S1 trend, S2 approaching the action limit, or pressure loss reducing flow
Short-chain PFAS are significant or GAC breakthrough is too fast	PFAS-selective anion resin or GAC + resin, based on vendor data and water matrix	Inlet/inter-vessel/outlet samples, competing anions, TOC, and media-capacity projection	Detection at the inter-vessel point, feed-water matrix change, or treated capacity approaching projection
Several dissolved contaminants are present or the outlet target is tight	RO/NF with pretreatment, antiscalant or softening where needed, and a reject route	Feed, permeate, concentrate, recovery, rejection, normalized flow, and sanitation	Permeate TDS rise, rejection decline, fouling/scaling, or concentrate-disposal issue
Home faucet, pantry, or small drinking point	POU unit with a certified PFAS-reduction claim for the exact model and cartridge	Feed/outlet result after flushing, cartridge number, rated capacity, and replacement schedule	Capacity exhausted, flow drops, cartridge claim does not match analytes, or outlet result fails
After media or cartridge replacement	Flush, stabilize flow, then resample before claiming performance	Media batch number, replacement date, flush volume, and post-change laboratory result	Hold the treatment claim until the outlet meets the agreed action limit

For food, hotel, apartment, or refill projects, put the PFAS decision inside the broader water-quality log. PFAS does not replace microbiology checks, tank sanitation, cartridge logs, or other Indonesian Ministry of Health parameters that determine whether water can be released for consumption.

PFAS, or Per- and Polyfluoroalkyl Substances, are a group of man-made chemicals that have been used extensively in a variety of consumer and industrial products since the 1940s. These compounds are known for their water, oil, and heat resistant properties, making them extremely useful in a variety of applications. However, the same characteristics that make them so useful also make them very persistent in the environment, so they are often referred to as “forever chemicals.”

The presence of PFAS in the environment, especially in water sources, has become an increasingly pressing issue. Health agencies and regulators associate long-term exposure to certain PFAS with several health risks, including effects on immunity, cholesterol, reproduction, development, and some cancers. PFAS decisions therefore need compound-specific test results, not a broad assumption that every PFAS at every concentration carries the same risk.

In this article, we will explore what PFAS are, how these compounds can contaminate our water sources, their impact on health and the environment, and the steps we can take to protect ourselves and our families from PFAS exposure. We will also discuss various water treatment methods that can be used to reduce or remove PFAS from drinking water, ranging from simple solutions for households to large-scale water treatment systems.

In addition, we will look at how residential water treatment systems typically work, including the use of storage tanks, pumps, filters, and water softening systems. We’ll discuss the importance of chlorination in maintaining the microbiological safety of water, as well as other options such as reverse osmosis (RO) to address more specific water quality issues.

A better understanding of PFAS and water treatment systems will help us make more informed decisions about the water we consume daily. With this knowledge, we can take proactive steps to protect our health and the health of the environment from the growing threat of these contaminants.

Understanding PFAS and Their Impact

PFAS, or Per- and Polyfluoroalkyl Substances, are a group of synthetic chemicals that have been used extensively in various consumer and industrial products since the 1940s. These compounds have a unique chemical structure, with a carbon chain surrounded by fluorine atoms. This very strong carbon-fluorine bond makes PFAS very stable and resistant to degradation, whether by heat, water, or oil.

The water- and oil-resistant characteristics of PFAS make them very useful in a wide range of applications. Some common uses of PFAS include:

Stick-resistant coating on cookware
Waterproof materials in clothing and textiles
Fire-fighting foam
Oil-resistant food packaging
Personal care products such as cosmetics and shampoos
Industrial applications such as in the manufacture of semi-conductors

However, the highly stable nature of PFAS also means that many compounds in this group are persistent in the environment. PFAS have been found in many media, from ground and surface water to soil, air, and human and animal biomonitoring.

The widespread presence of PFAS in the environment has become a serious concern due to their potential health impacts. Studies have shown that long-term exposure to PFAS may be associated with a variety of health problems, including:

Increased risk of some cancers, especially kidney and testicular cancer
Impaired immune system
Fertility problems and pregnancy complications
Increased cholesterol levels
Disturbance of liver function
Disturbed growth and development in children
Thyroid hormone disorders

One of the main ways humans are exposed to PFAS is through contaminated drinking water. PFAS can enter water sources through a variety of pathways, including:

Industrial waste disposal
Use of firefighting foam containing PFAS
Seepage from landfills
Use of contaminated biosolids as fertilizer
Atmospheric deposition from industrial emissions

In Indonesia, Ministry of Health Regulation No. 2 of 2023 provides the drinking-water-quality framework, but a PFAS project still needs an explicit analyte list, method, and action limit. A “total PFAS” result without the compounds, LOQ, and method is not enough to select media or demonstrate compliance.

Given the persistence of PFAS in the environment and their potential health impacts, many countries have started taking measures to limit the use of and reduce exposure to these compounds. Some of the steps that have been taken include:

Prescription of maximum limit of PFAS in drinking water
Restriction or prohibition of PFAS use in certain consumer products
Increased monitoring of PFAS in water sources and the environment
Investment in water treatment technologies to remove PFAS
Public education on PFAS risks and how to reduce exposure

However, given the persistent nature of PFAS and their widespread use over decades, addressing the issue of PFAS contamination will be a long-term challenge. A comprehensive approach involving government, industry, and the public is needed to effectively address this issue.

Residential Water Treatment Systems and PFAS Handling

For PFAS, EPA identifies GAC, anion exchange, RO, and nanofiltration as technologies to evaluate. No option is automatically superior: GAC generally retains long-chain PFAS better than short-chain PFAS, selective resin still has finite capacity, and RO produces a PFAS-bearing concentrate that requires management.

Technology	Main strength	Limitation to include in design	Changeout or acceptance evidence
GAC	Mature adsorption process; practical for lead-lag vessels	PFBS/PFBA and other short-chain PFAS can break through sooner; natural organics compete; adequate EBCT is required	Inter-vessel PFAS trend against the action limit, treated volume, and bed volumes
PFAS-selective anion resin	Compact bed and strong affinity for many anionic PFAS	Use a resin projected for PFAS; competing anions and water matrix change capacity; spent media needs a disposal route	Inlet/inter-vessel/outlet samples plus a vendor capacity projection calibrated to field data
RO/NF	Broad barrier for long- and short-chain PFAS; useful for point-of-use or polishing	Recovery, scaling, energy, pretreatment, and PFAS concentrate management; rejection does not destroy PFAS	Feed/permeate/concentrate tests, integrity checks, normalized flow, and rejection

Do not substitute ordinary cation softening resin for PFAS-selective anion resin. The Watermart ion exchange range serves several duties; confirm resin type, PFAS data, and water conditions before selection. For carbon, compare Novasorb media or Calgon FILTRASORB on application data. For membranes, start with the reverse osmosis category and require a certified PFAS-reduction claim when that claim drives a household purchase.

Common components in a residential water treatment system include:

Storage tank: Typically used to store water from municipal water sources or wells.
Pumps: Used to circulate water through the treatment system.
Filters: Used to remove solid particles, sediment, and specified contaminants from water.
Water softener system: Removes hardness minerals such as calcium and magnesium; a conventional softener is not a PFAS treatment claim.
Disinfection system: Typically uses chlorine or UV to control pathogenic microorganisms; disinfection does not remove PFAS.
Reverse Osmosis (RO) system: A membrane barrier that can reduce dissolved contaminants when designed, operated, and verified for the target.

The following four methods can reduce PFAS, but they must be selected from test results and verified at the outlet:

Granular Activated Carbon (GAC): Adsorbs PFAS; performance depends on PFAS chain length, EBCT, natural organic matter, and bed age.
Reverse Osmosis (RO): Separates PFAS and other dissolved contaminants into a concentrate stream that requires management.
PFAS-selective anion resin: Adsorbs anionic PFAS; product type, competing ions, and the capacity projection determine selection.
Nanofiltration: A high-pressure membrane option to check against the target PFAS, water matrix, recovery, and concentrate plan.

The choice of an appropriate water treatment system will depend on a variety of factors, including source water quality, the types of contaminants present, household water needs, and available budget. For households using well water, for example, a more comprehensive system may be required as well water is more susceptible to contamination of various types, including iron, manganese, and bacteria.

For a household system, do not assume every RO unit or carbon cartridge performs equally against PFAS. Check the model, tested flow, capacity, contaminant-reduction claim, replacement schedule, and third-party certification that specifically names PFOA/PFOS or the relevant PFAS.

In addition to water treatment systems, there are several other steps you can take to reduce your exposure to PFAS:

Use a certified water filter to remove PFAS
Avoid using non-stick cookware that contains PFAS
Check product labels and avoid products containing waterproof ingredients or oils
Support policies and regulations that restrict the use of PFAS

It is important to remember that while household water treatment systems can be very effective in reducing PFAS, they are not a long-term solution to the problem of PFAS contamination. More extensive and systematic efforts are needed to address the sources of PFAS contamination and prevent their release into the environment.

Lead-Lag Sampling Locations and Breakthrough Triggers

Design sample ports before purchasing media. For two vessels in series, label raw water S0, the point after the lead/before the lag vessel S1, and final treated water S2. For RO, add permeate and concentrate. Obtain bottles, blanks, preservation, and holding-time instructions from the laboratory; a general chemical-sampling procedure is not automatically PFAS-clean.

Collect an S0/S1/S2 baseline after commissioning and stable flow.
Record date, flow, totalized volume, bed volumes, pressure loss, temperature, and feed-water changes with every sample.
Define an S1 warning limit and S2 action limit before operation. A detection or rising trend at S1 starts lead-lag rotation planning; S2 above the action limit requires isolation, confirmation, and immediate investigation.
After media replacement, move the verified lag vessel into lead service only when the project rotation procedure allows it. Rinse, resample, and document media batch and disposal route.
Do not change media on a six- or twelve-month calendar alone. Inlet concentration, PFAS profile, TOC, EBCT, and treated volume can move breakthrough earlier or later.

For drinking water, EPA Methods 533 and 537.1 together cover 29 PFAS and are validated EPA reference methods; Method 533 extends short-chain PFAS coverage. In Indonesia, confirm the analyte list, LOQ, matrix, accredited scope, bottles, blanks, and chain of custody before collection. The A3 Laboratories water-testing service at lab.id is a natural place to discuss sample type and current test scope; specifically confirm that the required PFAS analytes and method are available before scheduling.

The Importance of Chlorination and Other Disinfection Methods

While PFAS are the main focus in discussions on drinking water safety, it is important not to overlook the microbiological safety aspects of water. Microbiological contamination, such as pathogenic bacteria and viruses, remains a serious threat to human health, especially in developing countries such as Indonesia.

Chlorination has been the primary method for drinking water disinfection for more than a century. Although there are some concerns about chlorination byproducts, such as trihalomethanes (THMs), chlorine remains an effective and affordable disinfectant for both large and small-scale water treatment systems.

Some advantages of chlorination include:

Effective at killing most pathogenic bacteria and viruses
Provides residual protection in water distribution systems
Relatively cheap and easy to implement
Can help control water taste and odor

However, it is important to note that chlorine is not effective against some chlorine-resistant pathogens such as Cryptosporidium. Therefore, modern water treatment systems often utilize a multi-barrier approach that combines multiple disinfection methods.

In addition to chlorination, some other frequently used disinfection methods include:

Ultraviolet (UV) Disinfection: Uses UV light to inactivate microorganisms. Effective against a variety of pathogens, including Cryptosporidium, but does not provide residual protection.
Ozonation: Uses ozone to kill microorganisms. Highly effective but more complex to implement.
Chloramine: A combination of chlorine and ammonia that provides longer residual protection in the distribution system.
Chlorine Dioxide: An effective disinfectant that requires controlled generation and operation.

For household water treatment systems, UV disinfection is often a popular choice. Products such as Hydropro Ultraviolet can provide additional protection against pathogens that may have escaped the main treatment system.

It is important to remember that while a focus on emerging contaminants such as PFAS is essential, basic water safety still requires effective disinfection. A multi-barrier treatment train must address microbiological, chemical, and physical risks separately; chlorine or UV does not substitute for verified PFAS removal.

Conclusion

PFAS has emerged as one of the biggest challenges to ensuring drinking-water safety. Its environmental persistence, widespread use, and potential health effects have made it a priority for scientists, policymakers, utilities, and water users.

Addressing PFAS requires coordinated source control, monitoring, treatment, and public communication:

Control PFAS use and disposal at the source.
Investigate health effects and safer alternatives.
Monitor named PFAS in water sources and the environment.
Select and verify treatment against a defined action limit.
Communicate risks and practical exposure-reduction measures.

While source control develops, households and facilities can reduce exposure with a treatment unit whose exact model carries a PFAS-reduction claim and whose cartridge or membrane is replaced from verified capacity or monitoring. A generic “carbon” or “RO” label is not performance evidence; match the certified claim to the PFAS result and design flow.

PFAS is only one drinking-water risk. A complete treatment train must also manage microbiological and physical hazards; chlorination or UV still serves a separate disinfection duty.

The defensible decision is therefore evidence-led: define the analytes and limit, test the source, select treatment for the water matrix, provide sampling ports, and change media or membranes from monitoring—not a calendar assumption.

Three Interesting Questions and Answers

1. Is bottled water free of PFAS?

Answer: Bottled water is not automatically PFAS-free. Check the supplier’s current water-quality report for the named PFAS, test method, reporting limit, and result; do not infer PFAS performance from packaging or source claims alone.

2. How can PFAS affect aquatic ecosystems?

Answer: PFAS can move through aquatic food webs and expose wildlife and people who consume contaminated fish. Risk depends on the specific compound, concentration, species, and exposure route, so use local monitoring and fish-consumption advice rather than a generic PFAS result.

3. Are there safe alternatives to replace PFAS in consumer products?

Answer: Alternatives are being developed for several PFAS applications, including:

Silicone for non-stick coatings on cookware
Protein-based materials for firefighting foam
Silicone or hydrocarbon-based polymers for waterproof coatings on textiles
Paper-based materials or bioplastics for oil-resistant food packaging

Each alternative still requires safety and performance evaluation. In some cases, changing the product or process can eliminate the need for water- or oil-resistant chemistry.

References

World Health Organization. (2023). “PFAS in Drinking-water”. WHO/HEP/ECH/WSH/2023.1
Environmental Protection Agency. (2022). “PFAS Strategic Roadmap: EPA’s Commitments to Action 2021-2024”.
Binnie, C., & Kimber, M. (2013). “Basic Water Treatment (5th Edition)”. ICE Publishing, London.
Hendricks, D. W. (2011). “Fundamentals of Water Treatment Unit Processes: Physical, Chemical, and Biological”. CRC Press, Boca Raton.
Parsons, S., & Jefferson, B. (2006). “Introduction to Potable Water Treatment Processes”. Blackwell Publishing, Oxford.