Older homes with lead service lines or lead-containing plumbing solder face a dual challenge: PFAS from source water combined with lead leaching from internal plumbing. Addressing both contaminants requires understanding which filter technologies provide genuine dual protection.
Lead in Drinking Water
Lead enters tap water primarily through corrosion of lead service lines, lead solder, and brass fixtures — particularly in homes built before 1986 when lead solder was prohibited. Unlike PFAS, which originates in source water, lead contamination occurs within the home’s plumbing system. This means that whole-house treatment upstream of lead-containing pipes does not effectively address lead at the tap.
Technologies That Remove Both
Reverse osmosis is the strongest dual-contaminant solution, providing high removal rates for both PFAS and lead. Certified carbon block filters can also address both — look for NSF/ANSI 53 certification that specifically lists both lead reduction and PFAS reduction for the product. Not all carbon block filters certified for one contaminant are certified for the other, so verifying both claims is necessary.
Point-of-Use as the Right Installation Point
For lead and PFAS co-removal, point-of-use installation at the kitchen tap is particularly important. Installing a whole-house PFAS filter without a point-of-use lead filter leaves lead contamination from internal plumbing unaddressed at the tap. The correct approach is either a comprehensive point-of-use system certified for both, or point-of-use lead filtration combined with whole-house PFAS treatment.