Best Water Filter for PFAS UK

PFAS (Per- and Polyfluoroalkyl Substances), often called “forever chemicals”, have become one of the most talked-about water quality topics in recent years.

While UK drinking water remains among the safest in the world, increasing monitoring and stricter regulations have encouraged many homeowners to explore additional filtration options for peace of mind. Searching for the best water filter for PFAS UK has become more in demand recently with long term of effects of PFAS now being investigated.

If you’re looking for the best water filter for PFAS in the UK, reverse osmosis (RO) systems remain the gold standard. For a broader comparison of RO options, see our complete Reverse Osmosis Systems UK guide.

Reverse osmosis filters help reduce contaminants like PFAS, but they don’t prevent limescale. If hard water is also an issue, see our guide comparing the best water softeners in the UK.

Not sure which type of water filter is right for your home? Read our complete Water Filters UK guide for an overview of reverse osmosis systems, under-sink filters, countertop filters, whole-house filtration and water softeners.

Best Water Filter for PFAS UK: Quick Comparison

Our top recommendations are:

How to read this table: We prioritise specific PFAS-reduction evidence over general claims that a filter removes “chemicals” or “contaminants”. We have not laboratory-tested any of these systems for PFAS removal ourselves. Where we have first-hand experience — including the Waterdrop X12 and G5P700A — that experience relates to installation, size and everyday use rather than laboratory verification of PFAS reduction.

What Are PFAS?

PFAS — per- and polyfluoroalkyl substances — are a large family of synthetic chemicals used because they resist water, grease and heat.

They have been used in products including non-stick cookware, waterproof clothing, food packaging, cosmetics and firefighting foams. Their strong carbon-fluorine bonds mean many PFAS break down extremely slowly, which is why they are often called “forever chemicals.”

PFAS can enter rivers and groundwater through industrial use, waste disposal and historic contamination. From there, some may reach sources used for drinking-water production.

Are PFAS in Drinking Water Dangerous?

The answer needs some nuance.

Research has linked some PFAS, particularly PFOA and PFOS, with adverse health effects at sufficient levels of exposure, but toxicity data is still limited for many of the thousands of PFAS substances.

The Drinking Water Inspectorate says that the low levels currently detected in some UK drinking-water sources do not represent an acute or immediate health risk. Drinking water is also only one potential source of PFAS exposure; food, consumer products and household dust can contribute as well.

The concern is mainly their persistence and potential for long-term accumulation, which is why UK regulators are expanding monitoring and taking a precautionary approach. The Government’s 2026 PFAS Plan also sets out measures to better understand sources, reduce pathways into the environment and minimise exposure.

What This Means for UK Households

There is no reason for most households to assume their tap water is unsafe because PFAS have been detected somewhere in the UK.

However, people who want an additional reduction step may choose a filter with specific independent PFAS-reduction evidence, rather than simply buying a product advertised as removing “chemicals” or “contaminants”.

2026 UK PFAS Drinking Water Update

PFAS monitoring in UK drinking water has expanded substantially. The Drinking Water Inspectorate’s latest Drinking Water 2025 report, published in July 2026, says water companies across England and Wales carried out more than 666,000 analyses for individual PFAS during 2025, taking the total since 2012 to more than 2.3 million analyses.

In England and Wales there is currently no statutory numerical drinking-water standard for PFAS. Instead, the DWI uses a precautionary tiered system. Concentrations at or above 0.1 µg/L trigger its highest tier and require investigation and action by water companies.

The latest data shows that PFAS is primarily a source-water management issue rather than evidence that most UK tap water contains high PFAS levels. In 2025, the DWI recorded only two treated-water samples for individual PFAS at or above 0.1 µg/L in England, both involving PFOS at the same Southern Water treatment works. The water was subsequently blended within the distribution network.

However, lower PFAS concentrations are detected more widely. Of 989 treatment works in supply in England during 2025, 82 had Tier 2 concentrations in treated water when the combined concentration of monitored PFAS was considered. These concentrations were below the DWI’s 0.1 µg/L guidance value, but companies are expected to progressively reduce them.

Regulation is also developing. The Government’s UK PFAS Plan, published in February 2026 and updated in August, states that England intends to consult on introducing a statutory PFAS limit for public drinking-water supplies. It also commits to continued PFAS monitoring and wider sharing of Environment Agency PFAS risk-mapping data.

What this means for households: UK tap water remains tightly regulated, and the DWI says current monitoring does not indicate an acute or immediate health risk from the low PFAS concentrations detected in some supplies. But PFAS remains an active area of monitoring and regulation, particularly because these chemicals persist in the environment.

How Do Water Filters Remove PFAS?

PFAS are challenging contaminants because there are thousands of different compounds, and not every filtration method works equally well on every PFAS.

For household drinking water, the three technologies most relevant to PFAS reduction are reverse osmosis, activated carbon and ion-exchange media.

Reverse Osmosis

Reverse osmosis uses a very fine membrane to separate dissolved contaminants from drinking water.

Recent Drinking Water Inspectorate research found that membrane processes, particularly reverse osmosis and nanofiltration, achieved the highest PFAS removal efficiencies, with reductions of up to around 99% for many PFAS and more than 80% for short-chain compounds in the research reviewed.

This makes RO a strong option where broad contaminant reduction is the priority.

However, not every RO system has been independently tested for PFAS. For the products in this guide, we look for specific PFOA, PFOS or Total PFAS reduction evidence rather than assuming that being an RO system is sufficient.

Activated Carbon

Activated carbon can adsorb PFAS onto the surface of the filter media.

The DWI’s research found that granular activated carbon can be effective for longer-chain PFAS, but performance tends to be weaker for shorter-chain PFAS, which can break through the media sooner.

Filter size, carbon quality, contact time and cartridge replacement frequency can all affect performance.

For that reason, we would not recommend a carbon filter for PFAS simply because the packaging says “activated carbon.”

Ion Exchange

Specialist ion-exchange resins can also capture PFAS.

DWI research found ion exchange generally had greater capacity and longer operational performance than conventional granular activated carbon, although effectiveness still depends on the PFAS being targeted and the composition of the source water.

Some filters combine ion exchange with activated carbon or other media rather than relying on one treatment technology alone.

Look for Specific PFAS Certification

For consumers, the easiest way to separate meaningful evidence from marketing is to look for independent certification with a specific PFAS-reduction claim.

NSF/ANSI Standard 53 can cover PFAS reduction claims for filters using technologies such as activated carbon or ion exchange, while NSF/ANSI Standard 58 applies to reverse-osmosis systems.

The important distinction is that a product simply saying “NSF certified” does not automatically mean it is certified to reduce PFAS. Check whether its specific certification or performance sheet includes PFOA, PFOS or Total PFAS reduction.

Our Rule When Choosing a PFAS Filter

For this guide, our preference is:

specific independent PFAS certification → published PFAS performance data → filtration technology → manufacturer marketing claims.

That is why some well-known filters don’t make our Top 5 even if their manufacturers make broad claims about removing chemicals or contaminants.

If you’re unsure how hard your water is, use the water hardness checker UK.

Best PFAS Water Filters UK

1. Waterdrop G3P600 — Best Overall PFAS Water Filter

The Waterdrop G3P600 is our best overall choice for households specifically looking to reduce PFAS in their drinking water.

We have not personally installed or laboratory-tested the G3P600 for PFAS removal. Our recommendation is based on its current third-party certification, published contaminant-reduction information, reverse-osmosis design, UK availability and running requirements.

Waterdrop’s current UK documentation specifically lists PFOA and PFOS among the substances reduced by the G3P600. Waterdrop states that the system is certified by IAPMO R&T to NSF/ANSI 42, 53 and 58 for the reduction claims specified on its Performance Data Sheet, as well as NSF/ANSI/CAN 372 for lead-free material compliance.

That distinction matters. We give more weight to a system with specific PFOA/PFOS reduction documentation than to a filter that simply claims to remove “forever chemicals” without supporting performance information.

The G3P600 is a 600 GPD tankless reverse-osmosis system with a published 2:1 pure-to-drain ratio. It uses an 8-stage filtration process and includes a smart faucet showing water-quality and filter-life information.

At approximately 46 × 14.4 × 45 cm, it is relatively narrow compared with older tank-based RO systems, although you’ll still need suitable under-sink space, a drain connection and a nearby electrical supply.

Best for: households wanting a permanently installed reverse-osmosis system with current published PFOA/PFOS reduction claims.

Why we rank it first: specific PFAS-related reduction information, third-party certification, strong RO filtration, good UK availability and a relatively efficient 2:1 pure-to-drain ratio.

Main drawback: it requires plumbing and electricity and, like all conventional reverse-osmosis systems, produces some wastewater.

Our experience: we have extensive hands-on experience with other Waterdrop RO systems, but we have not installed the G3P600 in our own home, so this ranking is research-based rather than a first-hand G3P600 review.

Read Full Review: Waterdrop G3P600 Review UK

2. Waterdrop X12 — Best Premium High-Flow PFAS Option

The Waterdrop X12 is our premium choice for households that want very high flow, strong reverse-osmosis performance and current published PFAS-reduction claims.

Unlike the G3P600, we have physically handled and fit-tested the X12 in our own kitchen. We did not permanently install it because, in our double-bowl sink cabinet, the unit did not fit comfortably around the existing pipework. That real-world size issue is worth considering before buying.

Waterdrop’s current UK documentation specifically lists PFOA and PFOS among the substances reduced by the X12. The system is stated to be tested and certified by IAPMO R&T against NSF/ANSI 58 for the reduction claims on its Performance Data Sheet, with additional NSF/ANSI 42 and 372 certification.

The X12 has a published capacity of 1,200 GPD and a 3:1 pure-to-drain ratio, making it substantially faster than many conventional domestic RO systems. It also includes 11-stage filtration, alkaline remineralisation and a digital smart faucet.

Its dimensions are approximately 46.2 × 15.9 × 42.5 cm, so although the unit is relatively narrow, its overall depth and height still matter in a busy under-sink cupboard.

Best for: households wanting a premium, very high-output RO system with specific PFOA/PFOS reduction documentation.

Why consider it: 1,200 GPD capacity, efficient 3:1 pure-to-drain ratio, current PFAS-related claims, remineralisation and a more advanced faucet than most mid-range RO systems.

Main drawback: price and size. Waterdrop currently lists it at around £929, and our own fit test showed that a tankless system can still be awkward in a cupboard with substantial pipework.

Our experience: we inspected and physically tried the X12 beneath our own double-bowl kitchen sink, but did not permanently plumb it in or laboratory-test it for PFAS removal.

Read Full Review: Waterdrop X12 Review UK

3. Aquasana AQ-5300+ Claryum — Best Non-RO PFAS Filter

The Aquasana AQ-5300+ Claryum 3-Stage Max Flow is our best non-reverse-osmosis option for households that want strong PFAS reduction without RO wastewater or an electrically powered system.

We have not personally installed or laboratory-tested the AQ-5300+ for PFAS removal. Our recommendation is based on Aquasana’s current independent certification, published performance data, UK availability and replacement-filter requirements.

Aquasana’s current performance data reports 99.7% reduction of PFOA and PFOS, and the system is tested and certified to NSF/ANSI Standards 42, 53 and 401. Aquasana specifically lists PFAS reduction among the certified contaminant claims for this model.

Unlike reverse osmosis, the AQ-5300+ uses a combination of activated and catalytic carbon, ion exchange and sub-micron filtration. This means it can target PFAS and other contaminants while retaining more of the dissolved minerals naturally present in the water.

The system is rated for approximately 800 US gallons / 3,028 litres between filter changes and has a published flow rate of around 2.7 litres per minute. Aquasana recommends replacing the filter set after roughly six months or once the rated capacity is reached.

Aquasana Europe currently sells the AQ-5300+ in the UK for around £309, while replacement filter sets are listed at about £89.95 when available.

Best for: households wanting independently certified PFOA/PFOS reduction without installing a reverse-osmosis system.

Why consider it: strong published PFAS reduction, NSF/ANSI 53 certification, no RO wastewater, no electrical supply required and genuine UK availability.

Main drawback: it still requires under-sink installation and a dedicated filtered-water tap, and replacement cartridges are an ongoing cost.

Our experience: this is a research-based recommendation rather than a product we have personally installed or tested.

4. Culligan ZeroWater 5-Stage — Best No-Installation PFAS Filter

The Culligan ZeroWater 5-Stage is our best PFAS option for renters or anyone who wants a certified filter without plumbing, electricity or permanent installation.

We have not personally laboratory-tested ZeroWater for PFAS removal. Our recommendation is based on its current independent certification, published PFAS performance data and ease of use.

Culligan states that its ZeroWater 5-stage pitchers and dispensers are independently certified by IAPMO to NSF/ANSI 53 for 99.7% Total PFAS reduction. The tested PFAS group includes compounds such as PFOA, PFOS, PFHxS, PFNA, PFHpA, PFBS and PFDA.

Unlike an under-sink RO system, ZeroWater uses a gravity-fed 5-stage filtration process with ion-exchange media. There is no plumbing work and no wastewater, making it particularly practical for rented homes, students or anyone wanting a temporary filtration option.

The system also includes a TDS meter, but this is important: the meter does not measure PFAS. Culligan specifically states that it measures total dissolved solids and cannot be used to confirm PFOA/PFOS concentrations.

Best for: renters and households wanting certified PFAS reduction without installing an under-sink system.

Why consider it: 99.7% certified Total PFAS reduction, low upfront cost, no plumbing or electricity and easy UK availability.

Main drawback: filter life depends heavily on your tap-water TDS and household consumption. In high-TDS areas, cartridges may need replacing more frequently, increasing the ongoing cost.

Our experience: this is a research-based recommendation rather than a system we have personally tested.

5. Waterdrop G5P700A — Best PFAS System We Use at Home

The Waterdrop G5P700A is the reverse-osmosis system we actually use in our own home, so this is the one product in this guide where we can add genuine long-term ownership experience.

Waterdrop’s current UK documentation specifically lists PFOA and PFOS among the substances reduced by the G5P700A. The system is certified by IAPMO R&T to NSF/ANSI 58 for the reduction claims specified on its Performance Data Sheet, and to NSF/ANSI 372 for low-lead materials.

The G5P700A is a 700 GPD tankless reverse-osmosis system with a published 2:1 pure-to-drain ratio. It uses an 8-stage filtration system and includes alkaline remineralisation plus a smart faucet displaying TDS and remaining filter life.

Its dimensions are approximately 42.4 × 14.5 × 35.3 cm, which is one of the reasons it has worked well beneath our kitchen sink. It is noticeably shallower than the G3P600 and requires mains electricity.

From our own use, we have found it fast, convenient and easy to live with day to day. Our filtered-water TDS has typically been around 31 ppm. However, TDS does not measure PFAS, so we do not treat that reading as evidence of PFOA or PFOS removal.

Best for: households wanting a compact, high-output RO system with current PFOA/PFOS reduction documentation and remineralisation.

Why we include it: this is the system we actually use, so we can combine current PFAS certification information with genuine experience of installation space, water delivery, filter changes and everyday practicality.

Main drawback: it requires electricity and plumbing, produces wastewater as part of the RO process, and its current warranty is only one year.

Our experience: we have personally installed and used the G5P700A for an extended period, but we have not sent before-and-after water samples for laboratory PFAS testing. Our comments on PFAS reduction therefore rely on Waterdrop’s current certified performance claims, not our own household measurements.

Read Full Review: Waterdrop G5P700A Review UK

PFAS Filtration vs Hard-Water Treatment

PFAS contamination and hard water are two different water-quality issues.

A PFAS filter is designed to reduce contaminants such as PFOA and PFOS from drinking water. Reverse osmosis, activated carbon and specialist ion-exchange media can all be effective when the individual system has suitable PFAS-reduction evidence.

A water softener, by contrast, removes the calcium and magnesium responsible for hard water and limescale. It should not be relied on to remove PFAS.

If your priority is broad drinking-water filtration, see our Best Reverse Osmosis System UK guide.

If limescale is your main problem, see our Best Water Softener UK guide.

Frequently Asked Questions

Final Verdict: Best Water Filter for PFAS UK

If PFAS reduction is your priority, we would choose a filter based primarily on specific PFAS certification or published performance evidence, rather than broad claims about removing “chemicals” or “forever chemicals”.

For most households, our Best Water Filter for PFAS UK is the Waterdrop G3P600. It combines reverse osmosis with current third-party certification documentation that specifically lists PFOA and PFOS among its reduction claims.

The Waterdrop X12 is the premium alternative for households wanting much higher output. Its current documentation also lists PFOA and PFOS, while its 1,200 GPD capacity and 3:1 pure-to-drain ratio make it considerably more powerful. We physically fit-tested the X12 ourselves, although we did not permanently install it or laboratory-test it for PFAS.

The Aquasana AQ-5300+ Claryum is our preferred non-RO choice, with published NSF/ANSI 53 data reporting 99.7% PFOA/PFOS reduction.

For renters or anyone who doesn’t want plumbing work, the Culligan ZeroWater 5-Stage provides a much simpler no-installation option.

Finally, the Waterdrop G5P700A deserves a place because it is the system we actually use in our own home. Our experience tells us about installation, size and everyday usability — but our PFAS assessment still relies on certification and performance documentation rather than our own household testing.

Our 2026 picks

Best system we personally use: Waterdrop G5P700A

Best overall: Waterdrop G3P600

Best premium/high-flow: Waterdrop X12

Best non-RO: Aquasana AQ-5300+ Claryum

Best no-installation: Culligan ZeroWater 5-Stage