What class of chemicals in some AFFF formulations raises concerns for groundwater contamination?

• A. Chlorinated solvents
• B. Cycloalkanes
• C. Perfluorochemicals (PFCs)
• D. Aromatic hydrocarbons

Answer: (C)

The correct choice highlights perfluorochemicals (PFCs) as a class of chemicals in some Aqueous Film-Forming Foam (AFFF) formulations that are particularly concerning due to their potential for groundwater contamination. PFCs, which include a variety of compounds like perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), are highly resistant to environmental degradation. This persistence means that once they enter groundwater systems, they can remain for extended periods, posing a significant risk to water quality and ecosystem health.

Additionally, the chemical properties of PFCs—specifically, their ability to repel both water and oil—allow for effective firefighting but contribute to their mobility in the environment. These compounds have been detected in various water sources, raising concerns about exposure and the potential adverse health effects associated with them. In light of these factors, the use of AFFF containing PFCs calls for careful management to prevent groundwater contamination.