Coway USA Inc. and PFAS, what the company told Minnesota

Coway USA Inc. has filed 34 PFAS disclosures with the Minnesota Pollution Control Agency, covering 2 products and naming 5 distinct compounds across 12 components. 7 of those filings report the part is 90 to 100% PFAS by mass. Everything below is the company’s own statement to a regulator, not our assessment.

Disclosures filed
34
Products covered
2
Compounds named
5
Declared uses
6

How much is reported

Concentration bands as filed, heaviest declared first, with filings that give no concentration at the bottom. Counts are of filings, since one product can report more than one compound.

  • 90 to 100%7 filings
  • 600,000 to <900,000 ppm (90%)2 filings
  • 300,000 to <600,000 ppm (60%)2 filings
  • 10,000 ppm to <150,000 ppm (15%)7 filings
  • 1,000 ppm to <10,000 ppm (1%)12 filings
  • Practical Detection Limit to <100 ppm4 filings

All 34 filings

Airmega Series (Air purifier)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) (CAS 25067-11-2)
How much the filer reports,
90 to 100%

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Wires and Insulation
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
90 to 100%

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
90 to 100%

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) (CAS 25067-11-2)
How much the filer reports,
90 to 100%

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
90 to 100%

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Wires and Insulation
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
90 to 100%

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Moving Parts in Valve
What it is doing,
Lubricating agent
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
90 to 100%

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Functional / Water-Assisted Molded Parts
What it is doing,
Lubricating agent
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
600,000 to <900,000 ppm (90%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Functional / Water-Assisted Molded Parts
What it is doing,
Lubricating agent
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
600,000 to <900,000 ppm (90%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Power & Filter
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
300,000 to <600,000 ppm (60%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Power & Filter
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
300,000 to <600,000 ppm (60%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Lubricants and Greases
What it is doing,
Lubricating agent
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
10,000 ppm to <150,000 ppm (15%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Ink/Coating
What it is doing,
Surface modifier
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
10,000 ppm to <150,000 ppm (15%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
poly(vinylidene fluoride-co-hexafluoropropylene) (VDF-co-HFP (FKM 1)) (CAS 9011-17-0)
How much the filer reports,
10,000 ppm to <150,000 ppm (15%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Ink/Coating
What it is doing,
Surface modifier
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
10,000 ppm to <150,000 ppm (15%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Lubricants and Greases
What it is doing,
Lubricating agent
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
10,000 ppm to <150,000 ppm (15%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
poly(vinylidene fluoride-co-hexafluoropropylene) (VDF-co-HFP (FKM 1)) (CAS 9011-17-0)
How much the filer reports,
10,000 ppm to <150,000 ppm (15%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Sealing / Elastomer
What it is doing,
Sealant
Compound,
poly(vinylidene fluoride-co-hexafluoropropylene) (VDF-co-HFP (FKM 1)) (CAS 9011-17-0)
How much the filer reports,
10,000 ppm to <150,000 ppm (15%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Active/IC Components
What it is doing,
Insulators
Compound,
1-Propene, 1,1,2,3,3,3-hexafluoro-, oxidized, polymd. (CAS 69991-67-9)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
1-Propene, 1,1,2,3,3,3-hexafluoro-, oxidized, polymd. (CAS 69991-67-9)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Wires and Insulation
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) (CAS 25067-11-2)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Electromechanical
What it is doing,
Lubricating agent
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Active/IC Components
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Flame Retardant Plastic
What it is doing,
Flame retardant
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Active/IC Components
What it is doing,
Insulators
Compound,
1-Propene, 1,1,2,3,3,3-hexafluoro-, oxidized, polymd. (CAS 69991-67-9)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
1-Propene, 1,1,2,3,3,3-hexafluoro-, oxidized, polymd. (CAS 69991-67-9)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Wires and Insulation
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) (CAS 25067-11-2)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Active/IC Components
What it is doing,
Insulators
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Electromechanical
What it is doing,
Lubricating agent
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Flame Retardant Plastic
What it is doing,
Flame retardant
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
1,000 ppm to <10,000 ppm (1%)

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxybutane (CAS 163702-07-6)
How much the filer reports,
Practical Detection Limit to <100 ppm

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Airmega Series (Air purifier)COWAY
Where in the product,
Batteries
What it is doing,
Binder
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
Practical Detection Limit to <100 ppm

HTS 8421.39.0115 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Passive Components
What it is doing,
Insulators
Compound,
1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxybutane (CAS 163702-07-6)
How much the filer reports,
Practical Detection Limit to <100 ppm

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Bidetmega series (Bidet)COWAY
Where in the product,
Batteries
What it is doing,
Binder
Compound,
poly(tetrafluoroethylene) (PTFE) (CAS 9002-84-0)
How much the filer reports,
Practical Detection Limit to <100 ppm

HTS 3922.90.0000 · Minnesota disclosure MN-N83T8YZ · published 2026-09-29

Other companies that have filed

Source, manufacturer filings made to the Minnesota Pollution Control Agency under the state’s PFAS in Products law and published through PRISM, run by the Interstate Chemicals Clearinghouse. These are the manufacturers’ own statements, not our grades and not laboratory results. A filing covers the product as sold in Minnesota and says nothing about products or formulations the company did not file. Reporting was still open when this was pulled, so absence from the set is not evidence a product is PFAS-free.