ANHE’s PFAS Toolkit discusses water filters. Drinking water filters are rated by NSF International, an independent organization that develops public health standards for products. The NSF database can be searched online for PFOA to find filters that reduce the PFAS in drinking water. Individuals who cannot filter their water can use another source of water for drinking. For home water filtration, a water filter must be able to reduce these chemicals to below the EPA health advisory limit of 4 parts per trillion. Certified products must be retested periodically, and manufacturing facilities must be inspected every year, which ensures products continue to meet all requirements.