PFAS Removal Water Treatment Companies
PFAS treatment providers, GAC, IX resins, RO, foam fractionation, and destruction technologies for forever chemicals.
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Buyer's guide
The buyer's guide to pfas removal water treatment
PFAS Removal Technologies: Activated Carbon, Ion Exchange, and High-Pressure Membrane Performance
Per- and polyfluoroalkyl substances (PFAS) represent a class of over 12,000 synthetic fluorinated compounds characterised by exceptional chemical and thermal stability, with C-F bond dissociation energy of 544 kJ/mol making them resistant to conventional treatment. PFOA and PFOS, historically the most prevalent, are regulated under EPA's April 2024 final rule at individual MCLs of 4 ng/L each; PFNA and PFHxS at 10 ng/L each; HFPO-DA (GenX) at 10 ng/L; and a hazard index of 1 for mixtures.
The EU Drinking Water Directive (2020/2184) sets a total PFAS limit of 500 ng/L and a sum of 20 priority PFAS at 100 ng/L. UK DWD transposition retains these values. Achievable treatment effluent concentrations: granular activated carbon (GAC) at empty bed contact time (EBCT) of 10 to 20 minutes achieves 70 to 90 percent removal of long-chain PFAS (C8+); ion exchange resins (single-use or regenerable) achieve greater than 95 percent removal; nanofiltration (NF) achieves 85 to 95 percent; reverse osmosis (RO) achieves greater than 99 percent rejection of PFAS.
Granular activated carbon (GAC) is the most widely deployed PFAS treatment technology. Coal-based GAC outperforms wood- or coconut-based carbons for PFAS adsorption due to higher micropore volume and surface chemistry. Key design parameters: EBCT of 10 to 20 minutes achieves regulatory targets for long-chain PFAS; short-chain PFAS (C4-C6, including PFBS and PFHxA) have lower GAC affinity and may require EBCT of 20 to 30 minutes or supplemental treatment. Spent carbon regeneration (thermal reactivation at 900 to 1,000 degrees C) destroys adsorbed PFAS; regenerated carbon exhibits 10 to 15 percent capacity loss per cycle. Single-use PFAS-selective ion exchange resins achieve greater than 95 percent removal to below 1 ng/L and are not thermally regenerable; spent resin requires high-temperature incineration (greater than 1,100 degrees C with afterburner) for PFAS destruction per EPA PFAS Destruction and Disposal Guidance (2024).
High-pressure membrane processes (NF and RO) reject PFAS as large, charged molecules: molecular weight cut-off (MWCO) for NF of 200 to 300 Da effectively rejects C6+ PFAS; RO rejects essentially all PFAS including short-chain compounds. Concentrate management is the critical challenge: PFAS-laden concentrate (2 to 8 percent of feed flow) requires evaporation or high-temperature incineration. Electrochemical advanced oxidation (EAO) using boron-doped diamond (BDD) electrodes mineralises PFAS in concentrate streams at energy inputs of 50 to 200 kWh per m3, achieving greater than 99 percent defluorination.
Sonochemical treatment (ultrasound at 20 kHz, 200 to 800 W/L) and photocatalytic reduction using UV/sulfite or UV/iodide systems are emerging technologies achieving PFAS mineralisation. US EPA classifies PFAS as hazardous substances under CERCLA (2024 rule), triggering site remediation requirements. Procurement of PFAS treatment systems requires supplier confirmation of PFAS destruction capacity for waste streams.
Frequently asked questions
What is the EPA MCL for PFAS in drinking water?
EPA's April 2024 final PFAS rule sets individual maximum contaminant levels (MCLs): PFOA at 4 ng/L (4 parts per trillion); PFOS at 4 ng/L; PFNA at 10 ng/L; PFHxS at 10 ng/L; HFPO-DA (GenX chemicals) at 10 ng/L. For mixtures of PFNA, PFHxS, HFPO-DA, and PFBS, a hazard index (HI) of 1.0 applies. Public water systems must comply by 2027 (monitoring), with treatment implementation by 2029. These are the first ever enforceable PFAS drinking water standards in the US. The EU Drinking Water Directive 2020/2184 sets total PFAS at 500 ng/L and sum of 20 priority PFAS at 100 ng/L, implemented by January 2026.
Which treatment technology best removes PFAS?
Technology selection depends on PFAS chain length and target effluent quality. For long-chain PFAS (C8+, PFOA/PFOS): GAC at EBCT 10 to 20 minutes achieves 70 to 90 percent removal; ion exchange resins (single-use) achieve greater than 95 percent to below 1 ng/L. For short-chain PFAS (C4-C6, PFBS, PFHxA): GAC is less effective; ion exchange (PFAS-selective resins) or RO are preferred, with RO achieving greater than 99 percent rejection. Combined systems (GAC polishing after RO) are used where multiple chain lengths are present. For small systems or point-of-entry treatment: NSF/ANSI 58-certified RO units are the most reliable solution. EPA's 2023 Drinking Water Treatment Technologies publication rates systems by removal efficiency and applicability.
How is PFAS-contaminated waste from treatment disposed of?
PFAS waste streams requiring disposal include: spent GAC (if not regenerated), spent single-use ion exchange resin, and RO/NF concentrate. EPA's PFAS Destruction and Disposal Guidance (December 2023, updated 2024) identifies high-temperature incineration (greater than 1,100 degrees C with afterburner, greater than 2 seconds residence time) as the preferred destruction method for solid PFAS wastes. Thermal reactivation of spent GAC (900 to 1,000 degrees C) destroys adsorbed PFAS and is preferred over landfill disposal. PFAS-concentrated liquids (RO concentrate) can be treated by electrochemical oxidation (BDD electrodes) or sent to permitted hazardous waste incineration. Landfill disposal of PFAS-laden waste is not recommended under EPA guidance due to leachate risk. Emerging EPA regulations may classify spent PFAS treatment media as RCRA hazardous waste.
Can PFAS be removed by standard water softening or chlorination?
No. Standard water softening (ion exchange for hardness, cation exchange) does not remove PFAS - PFAS are anionic or neutral compounds that are not affected by cation resin exchange. Chlorination, UV disinfection, ozonation, and conventional coagulation-flocculation-sedimentation have minimal PFAS removal efficiency - typically less than 10 percent. These conventional processes do not break C-F bonds. Advanced oxidation processes (AOPs) using hydroxyl radicals (H2O2/UV, ozone/H2O2) are also largely ineffective for PFAS mineralisation, as PFAS are resistant to hydroxyl radical attack (rate constant less than 10 to the 6 M-1 s-1). Effective PFAS removal requires GAC, ion exchange, or high-pressure membranes (NF/RO). Communities using chloramines or ozone for DBP control should still evaluate dedicated PFAS treatment as a separate process step.
Illustrative scenario · UK water company, groundwater supply serving 35,000 properties, South East England
A composite drawn from typical projects in this category, not a single client engagement. Figures are indicative.
- Challenge
- PFAS monitoring under the EU DWD 2020 watch list detected PFOA at 18 ng per L and PFHxS at 14 ng per L in a groundwater source, placing the supply above the EU sum of 20 PFAS parametric value of 100 ng per L when accounting for the full PFAS profile. Blending with unaffected sources was insufficient to achieve compliance on its own.
- Approach
- A full-scale GAC contactors installation (EBCT 18 minutes, coal-based GAC, two contactors in parallel) was designed and commissioned within 14 months under a regulatory enforcement timetable agreed with DWI. Spent GAC (after 18 months service at 3 to 5 ug per g loading) was sent to a licensed thermal reactivation facility. Ion exchange (single-use PFAS-selective resin) was evaluated as an alternative but deferred due to spent resin disposal uncertainty under evolving EA hazardous waste guidance.
- Outcome
- PFOA in product water fell to below 1 ng per L and PFHxS to below 2 ng per L, achieving compliance with the EU DWD parametric values. DWI lifted the monitoring enforcement notice 8 months after commissioning. The GAC system treated 3.8 Ml per day at an operating cost of 0.22 GBP per m3.
Questions to ask shortlisted providers
5
- 01
What is the full PFAS profile in the source water (chain length, concentrations, and seasonal variation)?
GAC performs differently for long-chain versus short-chain PFAS; short-chain compounds (C4 to C6) have lower carbon affinity and may require longer EBCT or supplemental IX to achieve compliance.
- 02
What is the proposed spent GAC or IX resin disposal route and is a licensed thermal reactivation or incineration facility contracted?
PFAS waste must be destroyed at above 1,100 degrees C; disposal logistics and cost must be confirmed before the treatment system is designed, as they significantly affect OPEX.
- 03
What EBCT has been confirmed as effective for achieving the target effluent PFAS concentration and at what service life?
EBCT and GAC service life determine the volume of carbon and regeneration frequency; a pilot or column study with site water should validate EBCT before full-scale design.
- 04
Has the DWI been informed and agreed the treatment approach and monitoring protocol?
PFAS treatment changes require DWI notification; the monitoring programme and sample analysis methodology (ISO 21675, EPA Method 533) must be agreed with DWI before operation.
- 05
What is the concentrate management plan if NF or RO is selected and has an EA permit been obtained for concentrate discharge?
RO concentrate containing concentrated PFAS requires specialist management; an EA environmental permit for the disposal route must be in place before commissioning.
What drives cost in this category
4
- GAC contactor capital and carbon volume
- GAC contactors for 5 to 50 Ml per day cost 1 to 8 million GBP; carbon volume at 18-minute EBCT is 10 to 80 m3 per Ml per day capacity, with coal-based GAC at 1,500 to 2,500 GBP per tonne.
- Spent GAC reactivation or disposal frequency
- Thermal reactivation at licensed facility costs 600 to 1,000 GBP per tonne; at 18-month service life and 10 t per Ml per day carbon inventory, reactivation OPEX is 0.05 to 0.12 GBP per m3 at high PFAS loading.
- PFAS analysis programme
- Full PFAS suite analysis (EPA Method 533 or ISO 21675, 20-compound panel) costs 300 to 700 GBP per sample; monthly compliance monitoring for a large supply requires 60,000 to 150,000 GBP per year in laboratory costs.
- Single-use IX resin system (if selected)
- PFAS-selective single-use resin systems cost 100,000 to 400,000 GBP per system for 1 to 5 Ml per day; spent resin disposal at licensed incineration facility adds 1,000 to 2,000 GBP per tonne.
Key regulations and standards
4
- EU DWD 2020/2184 and UK Transposition
- Sets total PFAS limit of 500 ng per L and sum of 20 PFAS at 100 ng per L; individual PFOA and PFOS limits tighten to 0.5 and 3 ng per L respectively; UK statutory instruments implement these values with DWI enforcement.
- DWI Guidance Note on PFAS (2021 and updates)
- DWI guidance sets monitoring requirements and treatment approval process for PFAS in drinking water; supplies above parametric values must notify DWI and agree a compliance schedule.
- EA Hazardous Waste Regulations 2005 (Spent PFAS Media)
- Spent GAC and IX resin from PFAS treatment may be classified as hazardous waste (EWC 19 09 04); disposal by licensed contractor with consignment notes to a permitted facility is mandatory.
- NSF/ANSI 58 and NSF/ANSI 61 (PFAS Removal Certification)
- NSF/ANSI 58 certifies point-of-use RO systems for PFAS removal; NSF/ANSI 61 certifies that treatment media and equipment do not introduce PFAS into drinking water; both certifications are relevant for PFAS treatment procurement.