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.
Wastewater Treatment Plants / Industrial Pretreatment Program
Laboratories Offering Home Testing
PFAS MCLs and Drinking Water
Statewide Testing Initiative
Official Correspondence
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PFAS can get into drinking water when products or wastes containing them are disposed of, used or spilled onto the ground or into lakes and rivers.
PFAS move easily through the ground, getting into groundwater that is used for some water supplies or for private drinking water wells. When released into lakes or rivers used as sources of drinking water, they can get into drinking water supplies.
PFAS released by facilities into the air can also end up in rivers and lakes used for drinking water.
| Analyte | Criteria |
|---|---|
| PFOA | 8 ppt |
| PFOS | 16 ppt |
| PFNA | 6 ppt |
| PFHxS | 51 ppt |
| PFBS | 420 ppt |
| PFHxA | 400,000 ppt |
| GenX (HXPO-DA) | 370 ppt |
Learn more about drinking water PFAS maximum contaminant levels
| Analyte | Criteria |
|---|---|
| PFOA | 170 ppt |
| PFOS | 12 ppt |
| PFBS | 670,000 ppt |
| PFHxS | 210 ppt |
| PFNA | 30 ppt |
Some water supplies draw water from a waterbody, treat the water, and then use it for drinking water.
| Analyte | Criteria |
|---|---|
| PFOA | 66 ppt |
| PFOS | 11 ppt |
| PFBS | 8,300 ppt |
| PFHxS | 59 ppt |
| PFNA | 19 ppt |
ppt = parts per trillion
Test results can vary depending on several factors including the depth of the drinking water wells, groundwater flow direction, and geological characteristics underground. PFAS contamination in groundwater can be found at different depths in the ground depending on the aquifer thickness, type, and whether sand or clay are present. Groundwater flows in certain directions and paths, and depending on your home's and drinking water well's location in relation to the PFAS contamination source, your testing results might show different levels of PFAS than your neighbors well.
Health effects associated with PFAS include:
Studies in animals help us understand what could happen in people. Animals given very high amounts of PFOS and PFOA showed:
If you have medical questions, talk with your doctor. You may find ATSDR's fact sheet, "Talking to Your Doctor about Exposure to PFAS" helpful.