Step 1: Test Your Water First
Before selecting a treatment system, confirm that PFAS is actually present in your water supply and at what levels. Municipal customers can request recent PFAS test results from their water utility — these are available through annual Consumer Confidence Reports and utility websites. Well owners should arrange independent laboratory testing using EPA Method 533 or 537.1. Knowing your specific PFAS compounds and concentrations allows you to verify that your chosen treatment system is rated to address the compounds present at their actual concentrations.
Step 2: Choose Your Treatment Technology
For most households, the choice is between reverse osmosis and activated carbon block filtration. Reverse osmosis provides the broadest PFAS removal across all compound types, including short-chain PFAS, but produces reject water and requires more extensive installation. Activated carbon block systems certified under NSF/ANSI 53 for PFAS reduction are simpler to install and maintain, with demonstrated effectiveness for long-chain PFAS compounds. If your water contains GenX, PFBS, or other short-chain PFAS, verify that your chosen system is specifically tested for those compounds.
Step 3: Verify Certification and Install Correctly
Purchase only systems with NSF/ANSI 53 (for activated carbon) or NSF/ANSI 58 (for reverse osmosis) certification with specific PFAS reduction claims listed in the NSF certified products database. Follow manufacturer installation instructions exactly — improper installation can bypass filtration media and reduce effectiveness. For under-sink systems, ensure the dedicated filtered water tap is used exclusively for drinking and cooking, not bypassed. Replace filter cartridges on the manufacturer’s recommended schedule, not based on visible filter appearance.
Step 4: Verify Performance After Installation
Test your treated water shortly after installation to confirm that PFAS levels have been reduced to your target concentration. This is particularly important for households with high influent PFAS levels or those using the treatment system for infant formula preparation. Annual testing of treated water provides ongoing confirmation of system performance and can detect media breakthrough before compliance thresholds are exceeded. Keep records of installation date, filter replacement dates, and test results to track system performance over time.