PFAS in Drinking Water: What the New EPA Rules Mean for Your Office

Nearly all people in the U.S. have PFAS in their blood, according to CDC's national biomonitoring survey. The same data carry a quieter second fact: blood PFOS levels fell more than 85% and PFOA more than 70% between 1999–2000 and 2018–2019, once manufacturers phased the older compounds out. Exposure is everywhere, and it also responds when a source is cut off.

I work in the water business, so I'm biased. But the implications of this contamination are significant.

The Rules Just Changed

The EPA has established enforceable Maximum Contaminant Levels (MCLs) for six PFAS chemicals in drinking water. Public water systems have until 2027 to complete initial monitoring and 2029 to comply with the limits. Update, September 2026: in May 2026 EPA proposed letting systems request two more years, to 2031 — the 4.0 ppt limits for PFOA and PFOS stay as written — and separately proposed rescinding the limits for PFHxS, PFNA, GenX and the mixture rule. Final action on both was still pending as of September 2026.

Your office water system? It's probably not ready.

PFAS do not break down naturally in the environment or human body. They're called "forever chemicals" for a reason. Once they're in you, they stay.

What This Means for Your Office

By 2027, public water systems must have finished their initial PFAS monitoring and be reporting the results to the public.

But here's what nobody talks about: most office buildings have water systems that were installed before anyone cared about PFAS. The building might be new, but the approach to water treatment is old.

I see this constantly in Greater Madison offices. They have beautiful breakrooms with fancy coffee machines, but they're pulling water through systems that weren't designed to handle today's contamination challenges.

And Madison is not a hypothetical. PFAS were found at the city's Well 15 in 2017, the well was shut down in 2019, and it only went back into service in September 2025 after a $5.9 million granular activated carbon and ion exchange treatment plant was built for it. The utility's testing shows the treatment removes all measurable PFAS. That is what it takes at municipal scale.

The Productivity Connection

Most companies spend real money on wellness programs while ignoring the water their team drinks eight hours a day. I've written up what the dehydration research actually shows separately; the short version is that mild dehydration measurably affects mood and concentration.

But if your office water contains PFAS, you're not just dealing with dehydration. You're dealing with chemicals that accumulate in the body and don't leave.

The Real Problem

The EPA's new rules are good. They're necessary. But they only apply to public water systems. Your office building's internal water treatment? That's on you.

Most offices are running on assumptions that made sense in 2015. The water comes in clean, we add some basic filtration, everyone's happy. But PFAS changes that calculation completely.

These chemicals pass through a basic taste-and-odor filter. Removing them takes the same families of treatment Madison used at Well 15 — activated carbon, ion exchange, or reverse osmosis — sized for a tap instead of a well.

What Actually Works

Point-of-use systems with the right filtration can handle PFAS. But you need to know what you're buying. Most "water coolers" aren't designed for this.

I install bottleless purified water systems because they work. The filtration is built to handle today's contamination challenges, not yesterday's.

But whether you go bottleless or not, the key is understanding what's actually in your water and having systems designed to deal with it.

The 2027 monitoring requirements are coming fast. Your team is drinking water every day that might contain chemicals found in nearly all Americans' blood.

That's not a wellness program. That's a problem that needs solving.