GenX Chemicals (HFPO-DA)
PFAS ("forever chemical")
Industrial discharge from fluoropolymer manufacturing (notably the Cape Fear River basin, NC).
EPA regulatory status
Legal limit (MCL)
10 ppt
Goal (MCLG)
10 ppt
MCL 10 ppt (ng/L), finalized April 2024. MCLG = 10 ppt. Also regulated within the PFAS Hazard Index. EPA's May 2025 plan PROPOSES to RESCIND the individual HFPO-DA (GenX) regulation; the proposal is not final, so the 2024 rule remains in force as of this data vintage.
Health effects
Linked to liver, kidney, immune, and developmental effects. GenX was introduced as a PFOA replacement but is itself a persistent 'forever chemical.'
This is general public-health information, not medical advice — consult your physician with any health concerns.
National violations
0
EPA's enforcement data (SDWIS/ECHO) records zero violations of GenX Chemicals (HFPO-DA)'s rule nationally. See this contaminant's regulatory status above for its current standard and compliance timeline — a zero count is not necessarily an all-clear.
How to remove GenX Chemicals (HFPO-DA)
anion exchange
NSF/ANSI 53
Frequently asked questions
What is GenX Chemicals (HFPO-DA)?
GenX Chemicals (HFPO-DA) is a PFAS ("forever chemical") regulated in US drinking water. Industrial discharge from fluoropolymer manufacturing (notably the Cape Fear River basin, NC).
What is the legal limit for GenX Chemicals (HFPO-DA) in drinking water?
MCL 10 ppt (ng/L), finalized April 2024. MCLG = 10 ppt. Also regulated within the PFAS Hazard Index. EPA's May 2025 plan PROPOSES to RESCIND the individual HFPO-DA (GenX) regulation; the proposal is not final, so the 2024 rule remains in force as of this data vintage.
What health effects does GenX Chemicals (HFPO-DA) have?
Linked to liver, kidney, immune, and developmental effects. GenX was introduced as a PFOA replacement but is itself a persistent 'forever chemical.'
How many violations of GenX Chemicals (HFPO-DA) limits are on record nationally?
EPA's enforcement data (SDWIS/ECHO) records zero violations of GenX Chemicals (HFPO-DA)'s rule nationally. See this contaminant's regulatory status above for its current standard and compliance timeline — a zero count is not necessarily an all-clear.
How do I remove GenX Chemicals (HFPO-DA) from my water?
Filter technologies certified to reduce GenX Chemicals (HFPO-DA) include: reverse osmosis (NSF/ANSI 58), activated carbon (NSF/ANSI 53), anion exchange (NSF/ANSI 53). Look for a filter independently certified against the specific NSF/ANSI standard for this contaminant — general "reduces contaminants" marketing claims are not the same as a contaminant-specific certification.
Source: EPA National Primary Drinking Water Regulations · Data as of 2026-07-16