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Filter and test-kit guidance is tied to what the source data show and to a relevant independent certification claim.

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A commission does not change which measurements are shown, how they are compared, or which certification standard is named. PFAS guidance points to NSF/ANSI 53 or 58 with a specific PFAS reduction claim; lead guidance points to a lead-reduction claim; lithium guidance states that no specific NSF/ANSI lithium-reduction claim exists.

EPA and NSF links are provided so you can verify regulatory information and current product certifications directly. EPA does not endorse commercial products referenced by this independent site.