Choosing the right PFAS filtration system starts with knowing what you are dealing with. Not all water supplies contain the same PFAS compounds or concentrations, and the filter that works best for one household may be unnecessary or insufficient for another. Water testing is the essential first step in a data-driven filtration decision.
Public Water System Data
If your home is served by a public water system, EPA regulations now require utilities to monitor for a specified PFAS panel and report results. Your utility’s annual Consumer Confidence Report (CCR) includes contaminant data. Some states require real-time online disclosure of PFAS monitoring results, providing more current information than the annual report.
Private Laboratory Testing
For well owners and households wanting comprehensive PFAS analysis beyond what utilities disclose, certified private laboratories can run EPA Method 533 or Method 537.1 analysis. These methods detect 25 or more individual PFAS compounds. When selecting a laboratory, verify certification by your state’s environmental agency for drinking water testing.
Interpreting Results
Current EPA maximum contaminant levels (MCLs) set limits of 4 parts per trillion (ppt) for PFOA and PFOS individually, and a hazard index approach for certain mixtures. Comparing your results against these regulatory limits and health advisories helps determine the urgency and appropriate level of filtration needed.
Testing After Filter Installation
Post-installation testing verifies that your chosen filter is achieving adequate PFAS reduction. Collecting samples from both before and after the filter using a certified laboratory’s supplied collection bottles, following exactly their chain-of-custody instructions, provides reliable performance verification data.