PFAS in Drinking Water: What the New EPA Limits Mean

PFAS—per- and polyfluoroalkyl substances—are a class of over 12,000 synthetic chemicals that have been used in manufacturing since the 1940s. They're called "forever chemicals" because they don't break down naturally in the environment or in your body.

What Are PFAS?

PFAS are found in non-stick cookware, water-resistant clothing, food packaging, firefighting foam, and countless industrial applications. Their chemical structure—a carbon backbone surrounded by fluorine atoms—makes them incredibly stable and resistant to heat, water, and oil.

That stability is also what makes them dangerous. When PFAS enter water supplies through industrial discharge, landfill runoff, or firefighting activities, they persist indefinitely.

Why Should You Care?

Research has linked PFAS exposure to:

Increased cholesterol levels
Changes in liver enzymes
Decreased vaccine response in children
Increased risk of high blood pressure during pregnancy
Increased risk of kidney and testicular cancer
Thyroid disease

In 2024, the EPA set enforceable limits for PFOA and PFOS at 4 parts per trillion (ppt)—essentially as close to zero as current technology can reliably measure—with limits for four additional PFAS compounds at 10 ppt.

Is PFAS in Your Water?

Probably. The Environmental Working Group estimates that over 200 million Americans have PFAS in their drinking water. Major contamination sites include areas near military bases, airports, and industrial facilities—but PFAS have spread far beyond those locations.

Your local water utility is required to test for PFAS and report results. Check your annual Consumer Confidence Report, or search the EWG's Tap Water Database for your ZIP code.

What Actually Removes PFAS?

Not all filtration is created equal. Here's what works:

Effective Methods:

Reverse Osmosis (RO): 90-99% removal. Forces water through a membrane that blocks PFAS molecules.
Activated Carbon (GAC): 70-90% removal. PFAS adsorb to carbon surface. Requires sufficient contact time.
Ion Exchange: 90-95% removal. Specialized resins attract and bind PFAS.

What Doesn't Work:

Boiling: PFAS don't evaporate. Boiling actually concentrates them.
Basic carbon pitchers: Insufficient contact time for meaningful PFAS reduction.
Most shower filters: Designed for chlorine, not PFAS.

The Bottom Line

PFAS contamination is widespread, persistent, and linked to serious health effects. While regulatory action is progressing, the most reliable protection today is point-of-use filtration using reverse osmosis or high-quality activated carbon systems with adequate contact time.

CUIVEN hydration systems use reverse-osmosis purification designed to reduce PFAS and a broad range of other contaminants. The Monolith shower filter uses catalytic carbon media selected to target chloramines and PFAS precursors; for drinking-water-grade PFAS reduction, pair it with an Opus system.

Sources: EPA PFAS Strategic Roadmap, Environmental Working Group, ATSDR

PFAS in Drinking Water: What You Need to Know