Households relying on private wells face a distinct challenge with PFAS contamination: unlike public water systems subject to federal monitoring requirements, private wells are the owner’s responsibility to test and treat. PFAS can reach well water through industrial discharges, firefighting foam use at nearby facilities, agricultural application of PFAS-containing biosolids, and leaching from landfills.
Testing Is the Essential First Step
Before investing in filtration, well owners should test for PFAS using a certified laboratory capable of running EPA Method 533 or Method 537.1 analysis. These tests detect a broad range of PFAS compounds, including short-chain varieties that older testing methods missed. Testing costs typically range from $150 to $400 depending on the PFAS panel and laboratory.
Appropriate Filter Technologies
For well water with PFAS detected above health advisory levels, reverse osmosis with pre-filtration is the most commonly recommended point-of-use solution. Pre-filters addressing sediment and other well water characteristics protect the RO membrane from premature fouling. Whole-house carbon systems can reduce PFAS in all water used in the home but require larger systems sized appropriately for well water flow rates and contamination levels.
Regular Monitoring After Installation
Installing a filter is not a permanent solution without ongoing monitoring. Well owners should re-test filtered water periodically — at minimum annually — to confirm continued filter effectiveness. Seasonal fluctuations in water table and precipitation events can change PFAS concentrations in well water, and filter performance should be verified after significant changes in source water quality.
Regulatory Assistance
Homeowners with PFAS-contaminated wells may be eligible for assistance from responsible industrial parties, state environmental agencies, or federal programs depending on the source of contamination. Documentation of contamination levels and dates is important for any future remediation claims.