Laboratories Offering Home Testing
PFAS MCLs and Drinking Water
PFAS Sites and Areas of Interest
There are two major classes of firefighting foam: Class A and Class B. Class B is also called Aqueous film forming foam (AFFF) and is usually created using PFAS. It is a highly effective foam used for fighting high-hazard flammable liquid fires, like gasoline, oil, and jet fuel.
Official Correspondence
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Values are listed in parts per trillion (ppt) which are equivalent to nanograms per liter.
|
Specific PFAS |
Drinking water MCL (ppt) |
|---|---|
|
PFOS |
16 |
|
PFOA |
8 |
| PFNA | 6 |
| PFBS | 420 |
| PFHxA | 400,000 |
| PFHxS | 51 |
|
HFPO-DA (GenX) |
370 |
A maximum contaminant level (MCL) is the maximum amount of a contaminant allowed in a public drinking water supply. Public water supplies are required to do this monitoring. MCLs are based on average detections over time.
Visit our Maximum Contaminant Levels (MCLs) page for more information.