PFAS enter landfills in a variety of ways:
In total, we estimate the total PFAS inputs to landfills to be between 4,477–4,823 lbs (2,030.7–2,187.7 kg) per year.
While landfills might serve as long-term containment sites for PFAS, they have not been designed explicitly for PFAS containment. The largest landfill challenge is in keeping PFAS compounds out of landfill leachate.
Single-layer clay liners (such as uncoated bentinite) may not be effective at sorbing PFAS chemicals.
Geosynthetic Landfill Covers have been successful in keeping PFAS compounds from seeping into groundwater. Testing on LLDPE co-extruded with EVOH have found negligible source depletion, indicating limited contaminant partitioning and diffusion.