Perfluorononanoic 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
Elevated cholesterol levels and immune 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 Perfluorononanoic 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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Where is Perfluorononanoic acid Found?
Perfluorononanoic acid has been detected above EPA health guidelines in 4 cities serving 3.3M people across the US.
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
Perfluorononanoic acid is classified as a PFAS contaminant.
Related PFAS Contaminants
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