PFAS in Arizona water: what's known, what to do
PFAS detections in the Phoenix supply are real. Here's what's being tested for, and what filtration actually removes it.
PFAS, per- and polyfluoroalkyl substances, are a class of about 12,000 chemicals used since the 1940s in non-stick cookware, fire-fighting foam, stain-resistant fabrics, and food packaging. They do not break down in the environment. They accumulate in human tissue. They are linked to cancer, immune dysfunction, and developmental issues at parts-per-trillion concentrations.
Phoenix-area detections
PFOA and PFOS have been detected in multiple Phoenix-area wells and treatment plants since 2023. Concentrations vary by source. The EPA finalized enforceable limits in 2024 at 4 parts per trillion for PFOA and PFOS individually.
What removes PFAS
- Certified granular activated carbon (GAC), reduces but does not eliminate
- Reverse osmosis, reduces PFOA and PFOS by >95% in independent testing
- Ion exchange resins (specialized), best for treatment plants, not point-of-use
For a Phoenix homeowner, the practical answer is RO at the kitchen sink with carbon at the main line. The combination handles PFAS plus the rest of the contaminant load.
