Does Onia swimwear have PFAS?
Onia swimwear averages 54 out of 100 on PFAS Authority's PFAS and toxin screen across the 8 Onia swimwear products graded as of October 2026, level with the 54 out of 100 median for the 27 other swimwear brands graded alongside it.
Onia swimwear averages Good on our four-band scale. None of them clear our buy threshold. That is above 61% of the swimwear brands we grade.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
Graded and flagged Poor and Bad, we’d swap these
Onia
$175 Onia Black Michelle One Piece Swimsuit Small Ymy1223
- nylon/polyamide blend (standard swimwear fabric)
- We found no PFAS statement from the brand
- Azo dyes and residual dye chemicals, Nylon swimwear uses acid or disperse dyes in manufacturing. Onia does…
3 hazards checked on this product. See all of them.
Onia
DVF X Ginny One Piece Swimsuit - New Women
- Nylon/polyester blend swimwear (likely nylon 6/6 or polyester with elastane)
- We found no PFAS statement from the brand
- Elastane (spandex) degradation over time, Elastane fibers degrade through chlorine, UV, heat, and repeated…
4 hazards checked on this product. See all of them.
Onia
NWT! Banana Republic Palm Print Isabella Swimsuit - Size Medium - New Women
- Nylon/polyamide swimwear (likely with elastane)
- We found no PFAS statement from the brand
- Azo dyes and color fastness, Banana Republic fabrics typically use reactive or disperse dyes; no specific…
4 hazards checked on this product. See all of them.
Onia
Size M Blue Shadow Ginny Block Mesh One-piece Swimsuit $245
- nylon mesh (primary fiber)
- We found no PFAS statement from the brand
- Elastic degradation and microfiber shedding, Like all synthetic swimwear, nylon elastane blends (typically…
2 hazards checked on this product. See all of them.
Onia
Swim Onia Sky Blue One Piece Swimsuit Scoop Neck Open Back Nylon Xs New
- Nylon swimwear (primary synthetic fiber)
- We found no PFAS statement from the brand
- Degradation and microfiber shedding, All synthetic swimwear sheds microfibers into water with wear and…
Onia
New Black One Piece Swimsuit - New Women
- Nylon with likely water-repellent coating finish (unspecified)
- We found no PFAS statement from the brand
- water-repellent coating chemical composition (unspecified), Onia does not publicly specify whether the…
2 hazards checked on this product. See all of them.
Onia
Two-Tone Swimsuit
- Nylon/polyester blend with water-resistant treatment
- We found no PFAS statement from the brand
- PFAS, Undisclosed water-resistant treatment is consistent with historical PFAS-based water-repellent coating…
3 hazards checked on this product. See all of them.
Onia
Rachel Watercolor Stripe Scoop Back Swimsuit
- Nylon/polyamide blend (swimsuit fabric), likely with water-repellent coating finish
- We found no PFAS statement from the brand
- Azo dyes in watercolor stripe printing, Nylon dyes may include azo compounds; while most are non-carcinogenic…
4 hazards checked on this product. See all of them.
Better swimwear from other brands
Graded higher than the Onia average of 54.
Patagonia
Women's Bottom Turn Racerback Bikini Top
- Nylon/polyester blend with elastane (standard swimwear)
- The brand calls it PFAS-free, which we have not verified
- Elastane (spandex) degradation under heat or chlorine
Solid & Striped
Taylor One Piece Seersucker Plaid
- Cotton/cotton-blend seersucker plaid
- We found no PFAS statement from the brand
- Azo dyes and colorfast stability
2 hazards checked on this product. See all of them.
Adidas
Women's Mexicana Florals Tie-Back Swimsuit
- Polyester/nylon swimsuit fabric, likely uncoated or standard finish
- Azo dyes and synthetic colorants
4 hazards checked on this product. See all of them.
The same question, asked of the other swimwear brands
Best average grade first. Onia averages 54.
See every Onia product we grade on the Onia brand page, or the full swimwear ranking.