Perfluorohexanesulfonic acid
Part of a class of synthetic compounds known as per- and polyfluoroalkyl substances (PFAS) widely used to make products more resistant to stains, water, and grease. PFHxS has been used in protective coatings for carpets, paints, and textiles and as a surfactant in industrial processes. It may also be found in food contact papers, fire-fighting foams, and cleaning products. PFHxS production has been phased out in the US, but ongoing concerns exist due to its high persistence in the environment and the body, legacy uses, and presence in imported goods. Exposure to elevated PFHxS levels may result in adverse effects to the thyroid and liver.
EPA MCLG Level
0.003 ppb
Maximum level that poses minimal health risk based on the latest science
Health Effects
As with many PFAS compounds, research into the health effects of PFHxS is rapidly evolving. Epidemiological studies have identified that PFHxS exposure may be associated with immunosuppression (i.e. reduced antibody response, impacting vaccine efficiency). Animal studies suggest PFHxS may cause increased liver weight, as well as adverse effects to thyroid hormone levels, and motor development.
Affected Organs & Systems:
Common Sources
- Not naturally occurring, so its widespread detection in drinking water can be attributed to human release
- Includes industrial waste, wastewater discharge, stormwater runoff, and the use of aqueous fire-fighting foams
- Elevated levels are often found near industrial sites with historic PFAS use
How to Remove It
Water filters certified under the following NSF standards are effective at removing Perfluorohexanesulfonic acid:
EPA MCLG Level
The EPA MCLG represents the maximum level that poses minimal health risk based on the latest scientific research. It's often more protective than federal legal limits.
Contaminant Type
Perfluorohexanesulfonic acid is classified as a PFAS contaminant.
This contaminant primarily affects the thyroid, developmental, and other systems.
Check Your Water
Find out if Perfluorohexanesulfonic acid is in your tap water.
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