PFAS are a huge group of thousands of man-made chemicals. We’ve used them since the 1940s in all sorts of things, like industrial processes, firefighting foam, non-stick pans, and even water-resistant clothes. People call them “forever chemicals” because their core carbon-fluorine bond is one of the strongest in organic chemistry. That means they don’t break down easily. PFOA and PFOS, two of the most studied PFAS, are in almost everyone’s blood, according to CDC data. We’re talking 97% of Americans.

Why PFAS in Drinking Water Is a Priority Health Issue

Just this past April 2024, the EPA set the first federal limits for PFAS in drinking water. They put the Maximum Contaminant Levels (MCLs) for PFOA and PFOS at 4 parts per trillion. That’s a tiny amount, but long-term exposure to PFAS can cause serious health problems. We’re talking higher risks of kidney and testicular cancers, thyroid disease, a weaker immune system, high cholesterol, and developmental issues during pregnancy. The Agency for Toxic Substances and Disease Registry calls PFAS a serious public health concern.

Which Treatment Technologies Actually Remove PFAS?

Here’s the thing: not every water treatment method gets rid of PFAS. Your standard water softeners, UV systems, and sediment filters? They just don’t cut it. But three technologies have proven they can remove PFAS, time and again, in independent tests:

Reverse Osmosis: Most Effective

RO is the top choice for removing PFAS right where you use the water. The RO membrane is like a super-fine filter. It physically blocks PFAS molecules because they’re simply too big to pass through. Studies from the Water Research Foundation consistently show RO removes 90-99% of PFOA, PFOS, and similar compounds. An under-sink RO system typically costs $200-$600 to install and will keep your drinking water safe at the tap.

Activated Carbon Filtration: Effective With Caveats

Granular activated carbon and carbon block filters work by “adsorbing” PFAS onto their porous surfaces. How well they work depends on a few things: the carbon type, how long the water stays in contact with it, the PFAS chain length, and how saturated the filter is. Shorter-chain PFAS are harder for carbon to catch and might slip through in noticeable amounts. If you’ve got PFAS in your water, you’ll need to replace carbon filters more often than you might expect.

NSF International now includes PFAS reduction in its Standard 53 and 58 testing. So, picking a product with a certified PFAS reduction claim is a really smart move.

Ion Exchange Resins: Highly Effective, Less Common Residentially

Anion exchange resins, specifically made to grab PFAS, get very high removal rates, often over 99%. They’re especially good at catching those short-chain PFAS that carbon sometimes struggles with. You’ll see these more often in big city water treatment plants than in homes, but you can find PFAS-selective ion exchange cartridges for home use, and they’re becoming more popular.

What Does NOT Remove PFAS

• Standard water softeners
• UV disinfection systems
• Sediment filters
• Boiling water (it just makes PFAS more concentrated)
• Standard ceramic or mechanical filters

Testing Your Water for PFAS

Want to know if your tap water has PFAS? You can get it tested through state-certified labs. It usually costs between $150-$400 for a detailed panel that checks for 30 or more compounds. Check with your state environmental agency or the EPA PFAS resources to see if PFAS contamination is known in your area. Even if there’s no known contamination nearby, testing is a good idea for private wells, especially if they’re close to industrial sites, military bases, or airports.

AMPAC USA PFAS Filtration Systems

AMPAC USA builds residential and commercial reverse osmosis systems that consistently remove 90-99% of PFAS. We use NSF-certified membrane parts. Our systems range from small under-sink units for homes to large commercial setups. Just contact AMPAC USA to talk about what’s right for you.

Frequently Asked Questions

Does boiling water remove PFAS?

No, boiling water won’t remove PFAS. In fact, it makes them more concentrated as the water evaporates. Boiling works for germs, but it does absolutely nothing for dissolved chemicals like PFAS, lead, or nitrates.

How do I know if my tap water has PFAS?

Call your water utility and ask for their latest water quality report. Public water systems have to test for and report PFAS under the new EPA rules. If you have a private well, you’ll need to get your own test from a state-certified lab.

Is RO better than carbon for PFAS removal?

For most homes, yes, RO is better. It gives you higher, more consistent PFAS removal for a wider range of PFAS types, including those short-chain ones that carbon struggles with. An RO system with multiple stages and a carbon pre-filter gives you the most complete protection for your home.

Sources: EPA PFAS | ATSDR PFAS | Water Research Foundation | NSF International

PFAS Removal from Drinking Water: Technology Comparison and Selection

PFAS, or per- and polyfluoroalkyl substances, are a huge family of over 12,000 synthetic compounds. What makes them notorious is their incredibly strong carbon-fluorine bond, which means they don’t break down in the environment. That’s why folks call them “forever chemicals.” PFAS in drinking water is a widespread problem: the Environmental Working Group estimates more than 200 million Americans drink water with detectable PFAS. Where do they come from? Mostly AFFF (aqueous film-forming foam) firefighting agents used at military bases and airports, industrial manufacturing, especially for PTFE/Teflon, and consumer products that use PFAS in their making or as surface treatments.

The EPA’s final rule in April 2024, setting MCLs for six PFAS compounds, was a big deal. PFOA and PFOS are now limited to 4 ppt individually, PFNA and PFHxS to 10 ppt, HFPO-DA (GenX) to 10 ppt, and PFBS is part of a hazard index mixture. These are incredibly low limits: 4 ppt means 4 micrograms per billion liters. To meet these rules, cities will need granular activated carbon (GAC) or anion exchange (AIX) treatment, or individual homes can use point-of-use systems.

Point-of-use reverse osmosis removes PFAS by physically blocking them and through charge repulsion at the membrane surface. A comprehensive NSF P473 certification, which is the specific standard for PFOA and PFOS reduction in POU systems, confirms that RO membranes reject both compounds below 70 ppt. (As of 2024, this standard is updated to meet the new MCLs.) Research consistently shows RO removes 90-99% or more of both long-chain and short-chain PFAS. Adding activated carbon pre-filtration to RO systems gives you even more PFAS adsorption before the membrane. AMPAC USA’s NSF-certified RO systems, with their enhanced carbon filtration, offer consumers and businesses the most reliable point-of-use PFAS removal technology out there.