Perfluorohexanesulfonic acid
EPA MCLG
0.00001 mg/L
The level in drinking water below which there is no known or expected risk to health. This is a goal, not an enforceable limit.
Health Effects
Immune, thyroid, and liver effects Developmental effects following repeated exposure during pregnancy and/or childhood
Source: EPA — National Primary Drinking Water Regulations (retrieved 2026-07-27)
Common Sources
- Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities
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The EPA MCLG for Perfluorohexanesulfonic acid is 0.00001 mg/L. Upload your water test (PDF or a photo) and we'll email a plain-English reading of where your result lands — and every other number — free. Educational only, no medical claims.
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Water filters certified under the following NSF standards are effective at removing Perfluorohexanesulfonic acid:
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Where is Perfluorohexanesulfonic acid Found?
Perfluorohexanesulfonic acid has been detected above EPA health guidelines in 17 cities serving 0.6M people across the US.
and 12 more cities
About the EPA MCLG
The EPA MCLG is the level of a contaminant in drinking water below which there is no known or expected risk to health. It is a non-enforceable public health goal, and is often stricter than the legal limit (MCL) water systems must meet.
Contaminant Type
Perfluorohexanesulfonic acid is classified as a PFAS contaminant.
Related PFAS Contaminants
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