Toxic 'Forever Chemicals' in Water : What is PFAS in Drinking Water?
Perfluorinated chemicals (PFCs)
Perfluorinated chemicals (PFCs) are a group of toxic chemicals most famous for their use in making Teflon non-stick pans. Created in a laboratory accident in 1938 and refined over the following years, Teflon is considered a "miracle chemical" due to its superior nonstick properties. However, perfluorinated chemicals have a toxic legacy.Polyfluoroalkyl and Perfluoroalkyl Substances (PFAS)
PFAS - poly- and perfluoroalkyl substances - were previously referred to as PFCs. Although there are almost 5,000 chemicals in the PFAS family, they all have a couple things in common: they're man-made chemicals and have a carbon and fluorine atom backbone. PFAS contamination is widespread; people and wildlife around the world have been exposed to it, even in the most remote reaches of this planet. These toxic substances have been found in rivers, lakes, groundwater, public water systems, soil, air, and in many types of animals on land and in the water. Disturbingly, 99.7 percent of Americans have PFAS in their blood! Since sunlight, microbes, and heat won't break them down - they're virtually indestructible - scientists call them "forever chemicals" due to their persistence in the environment and our bodies. These chemicals are still being introduced into environment and can persist for a very long time. Manufacturers use PFAS to make products and coatings that resist heat, oil, stains, grease, and water. For example, stain-resistant fabrics and carpets, water-repellent clothing, nonstick cookware, fast food packaging (i.e., pizza boxes), firefighting foam, and hundreds of other consumer products.Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS)
Perfluorooctanoic acid (PFOA) - known colloquially as C8 - and perfluorooctane sulfonate (PFOS) are the most widely studied PFAS chemicals. The largest producers of PFOA and PFOS in America - 3M and Dupont - have discontinued producing these chemicals, however very close variations of them are still being produced under different names. For example, in 2015 Dupont created spin-off company called Chemours which manufactures GenX, an alternative to PFOA. Chemours is one of largest producers of fluorochemicals in the world.What is the Limit for PFAS in Drinking Water?
Independent scientific studies have recommended a PFAS limit of 1 part per trillion (PPT) in drinking water. For water, the EPA provides a health advisory of no more than 70 PPT for PFOA and PFOS combined. To put 70 PPT in perspective, that's roughly 70 droplets in an Olympic-sized pool. This is only a "guideline" though and not enforceable. 70 PPT is a tiny, tiny amount but our cells do respond to such chemicals at a part-per-trillion concentration. Federal limits don’t always mean safe. As Environmental Working Group (EWG) explains:Legal limits are based on economic and political considerations that usually don’t reflect the lower levels that scientists have found pose health risks. Indeed, over 85 percent of the cancer risk calculated in the EWG study is due to contaminants that were below legal limits. Legal limits may also be based on outdated science: No new contaminants have been added to the list of nationally regulated drinking water pollutants in two decades. – Environmental Working Group, 2019
Why is PFAS a problem in our water?
Hundreds of millions of Americans could have PFAS-contaminated drinking water. PFAS in water are a huge concern because exposure can cause significant, adverse health effects. One study has linked PFOA exposure with high cholesterol, ulcerative colitis, thyroid disease, pregnancy-induced hypertension, and testicular and kidney cancers. Corporations that have knowingly and unknowingly introduced these chemicals to the environment have done little financially or otherwise to fix the problem, leaving utilities and drinking water suppliers with the responsibility and bill, and people with the lasting health effects. As one scientist points out, water filters are really only a temporary solution to the issue and “the real goal should be control of PFAS contaminants at their source.” (Detlef Knappe, 2020). The Devil We Know (BBC Four, 2018) is a blood-boiling documentary about a West Virginia community that confronts DuPont after they discover it has knowingly been dumping toxic chemicals into the local drinking water supply. Dark Waters (2019 Film), starring Mark Ruffalo and Anne Hathaway, is a dramatized take on Robert Bilott's case against DuPont after they hazardously dumped PFOA and PFOS. Both movies are unsettling and well-worth watching to understand the scope of this issue and why PFAS is a problem in water.PFAS in Water Health Effects
Exposure to PFAS in water can cause significant, adverse health hazards including but not limited to:- High cholesterol
- Ulcerative colitis
- Thyroid disease
- Pregnancy-induced hypertension / preeclampsia
- Cancer - testicular, kidney
- Developmental effects to fetuses during pregnancy
- Immune effects
- Thyroid effects
Do water filters remove PFAS?
Not all water filters completely remove toxic polyfluoroalkyl and perfluoroalkyl substances (PFAS). In fact, only certain water filtration technologies remove or reduce them. Reverse osmosis (RO) and activated carbon filtration, and anion exchange treatment are the most effective for PFAS, PFOA / C8 (perfluorooctanoic acid), PFOS (perfluorooctane sulfonate), and PFCs (perfluorinated chemicals). Among these technologies, not all systems are created equal or necessarily remove all PFAS either though. Keep in mind that the effectiveness of any filter in removing and reducing PFAS depends on the concentration of PFAS in the incoming water, how old the water filter is, size of the filter, flow rate, inlet line pressure, and local water conditions.
Does reverse osmosis remove PFAS?
Yes, reverse osmosis is extremely effective at removing PFAS. Research by Duke and NC State scientists found that RO systems were over 90 percent effective at removing a wide range of PFAS. They tested for three perfluoroalkal sulfonic acids (PFSAs), seven perfluoroalkyl carboxylic acids (PFCAs) and six per- and poly-fluoroalkyl ether acids (PFEAs) including GenX. Reverse osmosis had a near perfect removal of these PFAS.What's the Best Water Filter for Removing Toxic PFAS?
Our top picks for removing and reducing toxic PFAS from drinking water- HydroGuard reverse osmosis system
- PS-PURUF - 0.02 Micron Ultrafiltration Membrane System with 0.5 micron activated carbon filter for lead / chemicals / heavy metals