Per- and polyfluoroalkyl substances, commonly known as PFAS, are a class of over 12,000 synthetic chemicals that have been manufactured and used in industrial and consumer products since the 1940s. They are called "forever chemicals" because their carbon-fluorine bonds are among the strongest in organic chemistry, meaning they do not break down in the environment or in the human body over any practical timeframe. PFAS have been used in nonstick cookware, food packaging, stain-resistant fabrics, firefighting foams, and hundreds of industrial processes. As a result, they have contaminated groundwater, surface water, and public water supplies across the United States, including numerous systems serving Southern California communities.
The health concerns associated with PFAS exposure are serious and well-documented. Epidemiological studies have linked chronic PFAS exposure to increased risk of kidney and testicular cancer, thyroid disease, immune system suppression, reproductive harm, and elevated cholesterol levels. In 2024, the EPA established the first-ever national drinking water standards for six PFAS compounds, setting maximum contaminant levels as low as 4 parts per trillion for PFOA and PFOS, the two most studied compounds in the class. These standards reflect the growing scientific consensus that even trace-level exposure over time poses meaningful health risks, particularly for children, pregnant women, and immunocompromised individuals.
Municipal water treatment plants are working to address PFAS contamination, but compliance timelines extend several years into the future, and not all utilities have the infrastructure or funding to implement advanced treatment at the plant level. In the interim, point-of-use treatment at the home remains the most reliable way to reduce PFAS exposure for your household. Activated carbon filters can reduce some PFAS compounds, but their effectiveness varies widely depending on filter quality, contact time, and the specific PFAS compounds present in your water.
Reverse osmosis is the most effective residential technology for PFAS reduction. A properly designed RO system with a quality membrane can reduce PFAS concentrations by 90 to 99 percent, including both long-chain and short-chain compounds that carbon filters often miss. For comprehensive protection, we recommend a multi-stage system that combines sediment pre-filtration, activated carbon, and reverse osmosis, followed by post-filtration and remineralization for optimal taste and mineral balance. This layered approach addresses PFAS alongside chlorine, lead, pharmaceuticals, and other contaminants that may be present in your supply.
If you are concerned about PFAS in your water, the first step is testing. Your local water utility is required to publish annual Consumer Confidence Reports that include contaminant data, and independent laboratory testing can provide a detailed analysis of your specific tap water. Water Techniques can help you interpret these results and design a treatment solution that addresses the contaminants found in your supply, giving you confidence that every glass of water in your home meets the highest safety standards.
