Baby Safety / Compounds / HFPO-DA (GenX)

Is HFPO-DA (GenX) safe for babies and kids?

High risk for kids

Infants accumulate HFPO-DA (GenX) through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.

What is hfpo-da (genx)?

The IUPAC name is azanium 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)propanoate.

Also known as: azanium 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)propanoate, AMMONIUM 2,3,3,3-TETRAFLUORO-2-(HEPTAFLUOROPROPOXY)PROPANOATE, azanium;2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)propanoate, Ammonium 2-(perfluoropropoxy)perfluoropropionate.

IUPAC name: azanium 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)propanoate
CAS number: 62037-80-3
Molecular formula: C6H4F11NO3
Molecular weight: 347.08 g/mol
SMILES: C(=O)(C(C(F)(F)F)(OC(C(C(F)(F)F)(F)F)(F)F)F)[O-].[NH4+]
PubChem CID: 51342034

Risk for babies

High risk

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Elevated risk

HFPO-DA exhibits developmental toxicity in rodent studies — it causes reduced fetal body weight, skeletal malformations (wavy ribs, variations in vertebral counts), and neonatal mortality at doses above human environmental exposure levels but with relevance for LOAEL-based risk assessment. Transplacental transfer of HFPO-DA has been documented in animal studies; the human developmental toxicity database is still emerging as HFPO-DA is a relatively recent contaminant. The EPA 2024 MCL of 10 ppt for drinking water is partly derived from developmental toxicity endpoints (EPA's health effects document for GenX). Pregnant women in the Cape Fear River Basin area of North Carolina were advised to use alternative water sources after GenX contamination was documented. Given HFPO-DA's shorter biological half-life, reducing drinking water exposure during pregnancy provides faster benefit than for long-chain PFAS with multi-year half-lives. Placental transfer rates and breast milk concentrations in humans are not yet well characterized.

Regulatory consensus

5 regulatory and scientific bodies have classified HFPO-DA (GenX). The classifications differ — that's the data.

Agency	Year	Classification
EPA CTX / Genetox	—	Genotoxicity: negative (Ames: negative, 1 positive / 7 negative reports)
EPA CTX / Genetox	—	Genotoxicity: negative (Ames: negative, 1 positive / 7 negative reports)
EPA CTX / Skin-Eye	—	skin sensitisation: in vivo (LLNA): Not likely to be sensitizing (score: low)
EPA CTX / Skin-Eye	—	skin irritation: in vivo: Studies Indicate No Significant Irritation (score: low)
EPA CTX / Skin-Eye	—	eye irritation: in vivo: Severe Irritation (score: high)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter hfpo-da (genx)

Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to HFPO-DA (GenX):

Exposure reduction (environmental contaminant)
Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.

Relative cost: 1.2-2×

Frequently asked questions

Is hfpo-da (genx) safe for kids?

What products contain hfpo-da (genx)?

HFPO-DA (GenX) appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to hfpo-da (genx)?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about hfpo-da (genx)?

HFPO-DA (GenX) has been classified by 5 agencies including EPA CTX / Genetox, EPA CTX / Genetox, EPA CTX / Skin-Eye, EPA CTX / Skin-Eye, EPA CTX / Skin-Eye, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See HFPO-DA (GenX) in the baby app

Look up products containing hfpo-da (genx), compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (2)

US EPA: National Primary Drinking Water Regulations for PFAS (April 2024 Final Rule) — HFPO-DA (GenX) Individual MCL 10 ppt; Health Effects Assessment (2024) — regulatory
US EPA: Human Health Toxicity Values for Hexafluoropropylene Oxide (HFPO) Dimer Acid and Its Ammonium Salt (GenX Chemicals) — Kidney, Liver, Developmental Toxicity; Oral and Inhalation Reference Values (2021) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →