Is Onia PFAS-free?
Across 16 graded products, Onia averages F (51/100). On disclosure, the brand says nothing publicly about PFAS. None of its products grade C or better yet. Grades are model-based estimates, not lab results.
Graded and flagged D and F, we’d swap these
Onia
Women's Michelle One-Piece
nylon/polyamide blend swimwear
Lower concern for a basic nylon swimsuit, but Onia's silence on water-repellent coating/treatment chemistry leaves moderate uncertainty.
⚠Risky category by default
Onia
Michelle One Piece
nylon/spandex blend (common swimwear)
Lower PFAS concern for a basic nylon swimsuit, but Onia discloses nothing, watch for water-repellent finishes.
⚠Risky category by default
Onia
Women's Marilyn One-Piece
Nylon/polyamide swimsuit fabric
Lower concern as a basic nylon swimsuit, but Onia discloses nothing about water-repellent coating treatments used.
⚠Risky category by default
Onia
Michelle One Piece in Pale Blue/white at Nordstrom, Size X-Small
Nylon/polyamide blend one-piece swimsuit
Lower concern, standard swimsuit fabric with no known water-repellent coating or stain treatments; brand silent on PFAS.
⚠Risky category by default
Onia
Jolie Bikini Top
Nylon and polyamide blend (swim fabric)
Lower concern, standard swim fabric with no known PFAS use, but brand offers no transparency.
⚠Risky category by default
Onia
New Black One Piece Swimsuit - New Women | Color: Black | Size: XS
Nylon with likely water-repellent coating finish (unspecified)
Lower PFAS concern for a basic nylon swimsuit, but Onia's water-repellent coating treatment details are opaque.
⚠Risky category by default
Onia
$175 Onia Black Michelle One Piece Swimsuit Small Ymy1223
nylon/polyamide blend (standard swimwear fabric)
Lower PFAS concern for basic one-piece swimsuit; no water-repellent coating or water-resistant treatment specified.
⚠Risky category by default
Onia
DVF X Ginny One Piece Swimsuit - New Women | Color: Blue | Size: M
Nylon/polyester blend swimwear (likely nylon 6/6 or polyester with elastane)
Lower concern, standard swimwear with no documented PFAS treatment, though no public commitment either.
⚠Risky category by default
Onia
Swim | Onia Sky Blue One Piece Swimsuit Scoop Neck Open Back Nylon Xs New | Color: Blue | Size: Xs | Dianaazalea's Closet
Nylon swimwear (primary synthetic fiber)
Lower concern than water-repellent coating-treated swimwear, but no PFAS transparency from brand.
⚠Risky category by default
Onia
Size M Blue Shadow Ginny Block Mesh One-piece Swimsuit $245
nylon mesh (primary fiber)
Lower concern; basic nylon swimwear with no known PFAS triggers, but brand discloses nothing.
⚠Risky category by default
Onia
NWT! Banana Republic Palm Print Isabella Swimsuit - Size Medium - New Women | Color: Gray/Green | Size: M
Nylon/polyamide swimwear (likely with elastane)
Lower concern; standard swimwear without water-repellent coating claims carries minimal PFAS risk, but brand transparency is absent.
⚠Risky category by default
Onia
Women's Soleil One-Piece Swimsuit
Nylon/polyamide blend with water-repellent finish
Skip or contact Onia directly about water-repellent coating chemistry; silent on PFAS is a red flag for performance swimwear.
⚠Waterproof or stain-proof treatment
Onia
Women's Arya One-Piece Swimsuit
nylon/spandex blend with water-resistant treatment
Moderate PFAS risk due to likely durable water repellency treatment; insufficient brand transparency.
⚠Waterproof or stain-proof treatment
Onia
Women's Allegra Tricot One-Piece Swimsuit
Nylon tricot with water-repellent treatment
Higher PFAS risk due to likely water-repellent coating treatment; Onia provides no transparency.
⚠Waterproof or stain-proof treatment
Onia
Rachel Watercolor Stripe Scoop Back Swimsuit
Nylon/polyamide blend (swimsuit fabric), likely with water-repellent coating finish
Skip if PFAS-concerned; swimwear water-repellent coating treatments commonly contain PFAS, and Onia does not disclose.
⚠Waterproof or stain-proof treatment
Onia
Two-Tone Swimsuit
Nylon/polyester blend with water-resistant treatment
Silent on PFAS; typical swimwear water-repellent coating treatment raises concern, request material disclosure.
⚠Waterproof or stain-proof treatment
Every grade uses the same public rubric. How grades work →