Do Hydro Flask water filters have PFAS?
Hydro Flask water filters average 99 out of 100 on PFAS Authority's PFAS and toxin screen across the 10 Hydro Flask water filters graded as of October 2026, above the 95 out of 100 median for the 63 other water filters brands graded alongside it.
Hydro Flask water filters average Excellent on our four-band scale. 10 of the 10 we graded are worth buying.
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.
What Hydro Flask says and does about PFAS
Hydro Flask does not publish a PFAS policy that we could find. In February 2024, during the controversy over lead in other brands’ tumblers, Cycling Weekly reported that Hydro Flask had said its bottles contain no lead, BPA, phthalates, heavy metals or PFAS. We could not locate that statement on Hydro Flask’s own channels, and we found no independent lab test of its products for PFAS.
- Brand statementCycling Weekly reported in February 2024 that Hydro Flask had released a statement saying its bottles contain no lead, BPA, phthalates, heavy metals or PFAS. Cycling Weekly ↗
- Brand statementHydro Flask’s own post that same week, as quoted by Gizmodo, said it had not used lead in its sealing process for over a decade, and did not mention PFAS. Gizmodo ↗
Sources checked September 14, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.
Hydro Flask water filters worth buying Good or better, best-graded first
Hydro Flask
32 oz Lightweight Flex Straw Bottle
- Stainless steel bottle; silicone straw
- Silicone straw degradation and microbial growth, Silicone is not prone to chemical leaching but can absorb…
2 hazards checked on this product. See all of them.
Hydro Flask
Micro Hydro Mini Bottle
- Stainless steel vacuum-insulated double wall
- Silicone/TPE gasket degradation, Cap seals and closure gaskets can degrade or harbor mold growth if not…
3 hazards checked on this product. See all of them.
Hydro Flask
Epic Water Filters The Answer 2.0 Hydro Flask Water Filter
- Activated carbon filter cartridge, stainless steel housing
- Bacterial growth in filter cartridge, Activated carbon filters become a growth medium for bacteria if not…
3 hazards checked on this product. See all of them.
Hydro Flask
24oz Standard Flex Straw Cap
- Stainless steel bottle, silicone straw cap
- Silicone degradation over time, Food-grade silicone is stable at normal temperatures but may degrade or…
2 hazards checked on this product. See all of them.
Hydro Flask
24oz Wide Mouth Flex Straw Cap
- Stainless steel bottle; polymer cap and straw
- Polymer cap/straw composition opacity, Hydro Flask does not publicly certify that caps and straws are free of…
4 hazards checked on this product. See all of them.
Hydro Flask
32 oz Wide Mouth Travel Bottle with Flex Straw Cap in Harbor Blue
- Stainless steel body and cap; flex straw likely polypropylene or silicone
- Flex straw material leaching (composition unconfirmed), Hydro Flask does not publicly specify whether the…
3 hazards checked on this product. See all of them.
Hydro Flask
32 oz Wide Mouth Water Bottle
- Stainless steel body, plastic lid (unspecified polymer)
- BPA & bisphenols, Hydro Flask does not publicly specify the lid polymer type or confirm BPA/BPS absence.…
3 hazards checked on this product. See all of them.
Hydro Flask
24 oz Wide Mouth Flex Straw Cap
- stainless steel bottle, silicone/rubber straw cap
- Silicone/rubber degradation and leaching, Silicone caps can degrade with repeated heat exposure (hot water…
2 hazards checked on this product. See all of them.
Hydro Flask
Bottle Standard Mouth
- Stainless steel body, rubber/plastic components
- PFAS, Hydro Flask does not disclose whether gaskets or seals contain Teflon-type coating, FEP, or other…
3 hazards checked on this product. See all of them.
Hydro Flask
Wide Mouth Flex Straw Bottle
- stainless steel insulation, silicone flex straw, polypropylene lid
- Bacterial and mold growth in straw/seal crevices, Silicone straws and threaded lid seams are known to trap…
2 hazards checked on this product. See all of them.
Better water filters from other brands
Graded higher than the Hydro Flask average of 99.
Aquamira
Water Storage Treatment 2 oz Glass Bottles 60 gallons Purification
- glass bottles, sodium dichloroisocyanurate treatment chemical
- We found no PFAS statement from the brand
- Chemical overdose or misuse
5 hazards checked on this product. See all of them.
Big Berkey
Empty Housing with NO Filters Included
- Stainless steel housing and spigot
- We found no PFAS statement from the brand
- Bacterial growth and biofilm if filters not replaced
5 hazards checked on this product. See all of them.
LifeStraw
Home Glass Water Filter Pitcher
- Borosilicate glass pitcher, replaceable activated-carbon filter cartridge
- Bacterial growth in filter cartridge if unmaintained
5 hazards checked on this product. See all of them.
The same question, asked of the other water filters brands
Best average grade first. Hydro Flask averages 99.
See every Hydro Flask product we grade on the Hydro Flask brand page, or the full water filters ranking.