Non-Toxic Under-Sink RO Systems, ranked by PFAS grade
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Top-graded picks in the categories readers replace first, every one scored on the same rubric.
- polypropylene filter housing, carbon/sediment cartridge
- We found no PFAS statement from the brand
- Bacterial growth in spent cartridges
3 hazards checked on this product, all on its full breakdown.
Avocado
Vegan Mattress
- organic cotton, natural latex, coconut coir, recycled steel coils
- The brand calls it PFAS-free, which we have not verified
- Heavy metals
2 hazards checked on this product, all on its full breakdown.
- polyurethane foam
- We found no PFAS statement from the brand
- Volatile Organic Compound (VOC) Off-Gassing
4 hazards checked on this product, all on its full breakdown.
All 24 under-sink ro systems PFAS Authority has graded reach its 70 point pass mark for PFAS and other toxins, as of October 2026. The highest graded is AQUASURE Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System at 100 out of 100.
The full ranking is below, best-graded first, with every score linking to the evidence behind it.
Are under-sink ro systems safe?
24 of the 24 under-sink ro systems we graded come back low-concern on our screen and 0 do not. Our grades are model-based assessments built from published materials, ingredient lists, certifications and brand disclosures, not laboratory tests, so they say what we can evidence rather than that anything is safe.
Best graded under-sink ro systems here
- 1AQUASURE Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System 100 out of 100
- 2AquaTru Under Sink Under Sink 100 out of 100
- 3APEC Water Systems RO-90 Reverse Osmosis Drinking Water Filter System 95 out of 100
Start here
The best non-toxic under-sink ro systems, ranked by grade
Buyer’s guide
What to look for in under-sink ro systems, and which brands grade best and worst
Under-Sink RO Systems, ranked.
The quickest read, what to skip and the top-graded picks worth buying instead.
Aquasure
Premier Series Reverse Osmosis System with Chrome Faucet AS-PR75AK
Skip until brand discloses filter and membrane PFAS status.
APEC Water Systems
RO-90 Reverse Osmosis Drinking Water Filter System
Lower-concern choice; standard RO filters don't inherently require PFAS, but brand makes no PFAS commitment.
Aquasure
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
Lower-concern RO system; standard filtration materials carry minimal PFAS risk, but brand is silent on the topic.
Why AQUASURE Premier Series 75 GPD Under Sink wins, and what it beats
Every grade on this page is one sum. A category starts from a baseline, each disclosed material or coating adds risk points, and each thing the brand or a third party has published takes them away. Below is that sum for the winner, then for 1 product it beats, so you can see exactly where the 5 points between the top and the bottom of this under-sink ro systems ranking come from.
The winner
Made of RO membrane, carbon filters, stainless steel housing.
- +15No PFAS disclosure. No public statement from the brand about PFAS in this product.
- -20Bare uncoated material. Recorded as a bare, uncoated material with no surface coating or treatment.
What the grade does not fix. It still carries one risk factor, No PFAS disclosure, and our graders recorded 4 other hazards on it. See the full breakdown.
What it beats, and why
What puts it behind. The winner earns -20 points for Bare uncoated material. We found nothing comparable published for this product.
Made of Carbon/RO membrane filters, plastic housing.
- +15No PFAS disclosure
- -10Base material not linked to PFAS. The main material recorded for this product is not one associated with PFAS.
5risk points, a grade of 95
No product on this page was physically tested by us. Every number above comes from published materials, ingredient and coating disclosures, certifications and brand statements, scored on one public rubric. Formulations change without notice, so check the current product listing before buying.
Which under-sink ro systems are PFAS-free? Good or Excellent, best-graded first
Aquasure
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
- RO membrane, carbon filters, stainless steel housing
- We found no PFAS statement from the brand
- Bacterial and microbial growth in housing and filters
4 hazards checked on this product, all on its full breakdown.
- Multi-stage filter cartridges (activated carbon, ion exchange resins)
- The brand calls it PFAS-free, which we have not verified
- Bacterial growth in filter cartridges
3 hazards checked on this product, all on its full breakdown.
- Carbon/RO membrane filters, plastic housing
- We found no PFAS statement from the brand
- Bacterial growth in stagnant filter cartridges
2 hazards checked on this product, all on its full breakdown.
APEC Water Systems
Ultimate RO-PERM Reverse Osmosis Drinking Water Filter System
- activated carbon, RO membrane, polypropylene housing
- We found no PFAS statement from the brand
- Bacterial growth in filter housings and membrane
3 hazards checked on this product, all on its full breakdown.
APEC Water Systems
APEC Water WQA 5-Stage Under Sink Water Filter System
- polypropylene housing, activated carbon cartridges, RO membrane
- We found no PFAS statement from the brand
- Bacterial growth in storage tank
4 hazards checked on this product, all on its full breakdown.
Aqua Guard
Aquaguard Ritz RO+UV Taste Adjuster Stainless Steel Copper Water Purifier
- Stainless steel housing, copper components, RO membrane, UV filtration
- We found no PFAS statement from the brand
- Bacterial or microbial growth in housing or membrane biofilm
3 hazards checked on this product, all on its full breakdown.
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- carbon/sediment filters, RO membrane, plastic housing
- We found no PFAS statement from the brand
- Bacterial growth in filter housing
4 hazards checked on this product, all on its full breakdown.
- RO membrane, carbon filters, polypropylene/polyethylene housing
- We found no PFAS statement from the brand
- Bacterial growth in filters if maintenance neglected
3 hazards checked on this product, all on its full breakdown.
iSpring
RCC7 5-Stage Under Sink Reverse Osmosis Drinking Water Filtration System
- activated carbon & RO membrane filters, polypropylene housing
- We found no PFAS statement from the brand
- Bacterial growth in unmaintained filters
3 hazards checked on this product, all on its full breakdown.
- activated carbon, sediment filters, RO membrane, plastic housing
- We found no PFAS statement from the brand
- Bacterial growth in housing and storage tank
4 hazards checked on this product, all on its full breakdown.
- Carbon filter, RO membrane, plastic housing (polypropylene/PVC typical)
- We found no PFAS statement from the brand
- Bacterial and microbial growth in filter stages
2 hazards checked on this product, all on its full breakdown.
Waterdrop
Restored Waterdrop G2 Tankless Reverse Osmosis System 7-Stage Under Sink water Filter
- Activated carbon, reverse osmosis membrane, polypropylene housing
- Bacterial growth in storage tank
3 hazards checked on this product, all on its full breakdown.
- reverse osmosis membrane, carbon filter cartridges, housing (likely plastic/resin)
- We found no PFAS statement from the brand
- Activated carbon cartridge shedding and bacterial growth
3 hazards checked on this product, all on its full breakdown.
- RO membrane, carbon filters, plastic housing
- Bacterial growth in storage tank or tubing
4 hazards checked on this product, all on its full breakdown.
- Reverse osmosis membrane, activated carbon, plastic housing (unspecified resin)
- BPA & bisphenols
4 hazards checked on this product, all on its full breakdown.
Aquasure
Premier Series 100 GPD Under Sink Reverse Osmosis System with Pressure Pump (AS-PR100E)
- Plastic housing, RO membrane, carbon filter media
- We found no PFAS statement from the brand
- Bacterial biofilm in storage tank
3 hazards checked on this product, all on its full breakdown.
- Plastic housing, carbon/RO filter media
- We found no PFAS statement from the brand
- Bacterial growth in storage tank and filter cartridges
3 hazards checked on this product, all on its full breakdown.
- Carbon and resin filters, plastic housing
- We found no PFAS statement from the brand
- Bacterial growth in filter cartridges and storage tank
5 hazards checked on this product, all on its full breakdown.
- RO membrane, carbon filters, plastic housing
- We found no PFAS statement from the brand
- Bacterial or mold growth in carbon cartridges and housing
2 hazards checked on this product, all on its full breakdown.
- Reverse osmosis membrane, plastic housing, carbon/activated carbon filter media
- We found no PFAS statement from the brand
- Plastic leaching from housing and tubing
4 hazards checked on this product, all on its full breakdown.
- RO/carbon filter cartridges, plastic housing
- We found no PFAS statement from the brand
- Bacterial growth in filter housing and cartridges
4 hazards checked on this product, all on its full breakdown.
- RO membrane, carbon filters, plastic housing
- We found no PFAS statement from the brand
- Plastic housing leachables (unidentified polymer type)
4 hazards checked on this product, all on its full breakdown.
Aquasure
Premier Series AS-PR75AK Reverse Osmosis Water Filtration System with Chrome Faucet
- Reverse osmosis membrane and carbon filters
- We found no PFAS statement from the brand
- Bacterial and biofilm growth in storage tank and membrane housing
2 hazards checked on this product, all on its full breakdown.
- RO membrane, activated carbon filter, chrome faucet
- We found no PFAS statement from the brand
- PFAS
3 hazards checked on this product, all on its full breakdown.
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