Water filtration

NSF P473-certified PFAS filters and the systems that earn the certification.

Most pitcher filters do not remove PFAS. Some do. We cover NSF/ANSI P473 (PFAS-specific) and NSF/ANSI 401 (emerging contaminants) certified systems across pitchers, countertops, under-sinks, and whole-house — and explain when reverse osmosis is worth the kitchen-counter footprint.

Articles

• cornerstone-review

  Best PFAS Water Filters in 2026 — Pitcher, Countertop, and System Picks

  Four water filters with verifiable PFAS testing — pitcher, countertop reverse osmosis, gravity, and budget pitcher. Vetted by NSF/ANSI P473 or published independent testing.

• news

  PFAS in Tap Water: Should You Be Worried?

  The EPA finalized national PFAS drinking water standards in April 2024. Here is what the rule does, when utilities have to comply, and how to know if you should filter sooner.

• explainer

  What is NSF/ANSI P473? PFAS Filter Certification, Explained

  The certification mark that actually means a water filter targets PFAS. What it tests, how to verify it, and why most pitchers do not have it.

• buying-guide

  Best Countertop Water Filters in 2026 — RO, Multi-Stage, and Gravity

  Countertop water filters with verifiable PFAS testing. Reverse osmosis, multi-stage carbon, and gravity systems compared.

• explainer

  PFOA vs PFOS vs GenX — What the Different PFAS Chemicals Actually Are

  PFOA, PFOS, GenX, PFNA — what each one is, what was banned, what replaced it, and what your filter has to handle.