Well Pump Components as Potential PFAS Sources
Private well pumps use various elastomers, seals, and lubricants that may contain fluoropolymer materials. As well pumps age, these materials can degrade and potentially release PFAS into pumped water. While the contribution from pump components is typically small compared to groundwater contamination, it represents an additional exposure consideration for PFAS-sensitive households.
Fluoropolymer Pump Seals and O-Rings
Many well pump designs use PTFE (Teflon) or FKM (Viton) seals and O-rings for chemical compatibility and durability. Under normal operating conditions, these materials contribute minimal PFAS to pumped water. However, as seals age and degrade—particularly in corrosive or high-temperature applications—PFAS release may increase. Pump replacement intervals affect this source contribution.
Pump Lubricants and Seal Conditioners
Some well pump lubricants and seal conditioners contain fluorinated additives for enhanced performance. Pump service personnel occasionally introduce lubricants during maintenance that can temporarily elevate PFAS in water after service. Selecting PFAS-free pump lubricants for service operations and documenting service activities helps identify potential source contributions from pump maintenance.
NSF 61 Compliance for Well Components
NSF/ANSI Standard 61 evaluates drinking water system components for chemical contribution to drinking water. Well pump components including seals, housing materials, and coatings should meet NSF 61 requirements to limit chemical contribution to pumped water. Homeowners replacing well pumps should specify NSF 61-compliant components and request documentation of PFAS testing for fluoropolymer-containing parts