Why Private Wells Are at Higher Risk
Approximately 43 million Americans rely on private wells for drinking water. Unlike public water systems, private wells are not subject to the EPA’s new PFAS maximum contaminant levels and receive no utility-funded treatment. Well owners are solely responsible for testing and treatment of their water supply.
Rural wells draw from groundwater that may be contaminated by nearby PFAS sources: agricultural fields that received PFAS-contaminated biosolids, nearby military or airport facilities that used AFFF, or industrial operations that discharged to groundwater. PFAS contamination is often invisible and odorless, meaning well owners may be exposed for years without knowing.
How to Test Your Well for PFAS
Well owners should test for PFAS using a certified laboratory that employs EPA Method 533 or EPA Method 537.1 — the standard methods for detecting a broad range of PFAS compounds. Sampling kits are available from certified labs; sample collection follows specific protocols to avoid contamination. Testing typically costs $150–$400 depending on the number of compounds analyzed.
Testing frequency matters: PFAS levels can change seasonally and in response to nearby land use changes. Initial testing should establish a baseline, with repeat testing recommended every 2–3 years or when nearby activities change. The EPA’s Safe Drinking Water Hotline (1-800-426-4791) can provide information on certified labs in your area.
Filtration Solutions for Private Wells
Reverse osmosis (RO) systems installed at the point of use (under the kitchen sink) are the most effective and affordable option for most private well users, removing 90–99% of PFAS. Whole-house RO systems provide PFAS-free water at every tap but require larger systems and more frequent maintenance.
Granular activated carbon (GAC) filters are effective for longer-chain PFAS including PFOS and PFOA but less effective for short-chain PFAS like PFBS and PFHxS. For wells in areas with complex PFAS mixtures, RO provides more comprehensive protection. Point-of-entry GAC systems sized appropriately for the well’s flow rate can provide household-level protection at lower upfront cost than whole-house RO.