Does Clayton, NC Water Have PFAS? What EPA's Testing Found

Triangle Waterworks · informational guide

Direct answer: Yes, in two of three 2024 rounds. EPA's UCMR5 monitoring of the Town of Clayton system (PWSID NC0351020) found PFOA at 4.3 and 8.2 parts per trillion and PFOS at 5.1 and 8.1 ppt — above EPA's 4.0 ppt limit for each — with a third round non-detect. This is monitoring data, not a violation. Carbon certified for PFAS removal handles what's there.

Does Clayton, NC water have PFAS?

Yes — EPA's UCMR5 monitoring of the Town of Clayton system (PWSID NC0351020) detected PFOA and PFOS in two of three 2024 sampling rounds. On January 23, 2024, the entry point tested at PFOA 4.3 ppt and PFOS 5.1 ppt. On June 24, 2024, both climbed to PFOA 8.2 ppt and PFOS 8.1 ppt. By October 15, 2024, both compounds came back non-detect.

UCMR5 is EPA's nationwide program for monitoring unregulated contaminants. It exists to build an occurrence picture across thousands of water systems, not to test individual utilities against a compliance deadline. Clayton's results are real, verified readings — reported here exactly as EPA published them, with the rise and the non-detect round both included.

How do Clayton's PFAS numbers compare to EPA's limit?

EPA's April 2024 PFAS rule set enforceable Maximum Contaminant Levels of 4.0 ppt each for PFOA and PFOS. Two of Clayton's three UCMR5 rounds sit above that number: 4.3 and 8.2 ppt for PFOA, 5.1 and 8.1 ppt for PFOS.

That comparison is worth stating plainly, but it isn't a violation. UCMR5 is monitoring data collected to build a national occurrence dataset, not the compliance testing utilities are held to under the rule. EPA's 2024 rule set a compliance date of 2029 for those limits, and in May 2026 EPA proposed keeping the 4.0 ppt limits while letting systems request two additional years, to 2031. Nothing in this dataset says Clayton is out of compliance today.

What other PFAS compounds showed up in the testing?

Alongside PFOA and PFOS, the same UCMR5 rounds also found PFBS, PFHxA, and PFPeA at low levels — 3.2 to 4.0 ppt for PFBS, 3.1 to 5.9 ppt for PFHxA, and 3.4 to 6.4 ppt for PFPeA. None of these three carries an individual EPA Maximum Contaminant Level.

Every other PFAS compound in the UCMR5 panel came back non-detect at every round tested. The reporting limit EPA used for PFOA and PFOS in this dataset was 4 ppt.

Does Clayton's own water quality report mention PFAS?

No — and that's a separate record worth knowing about, not a contradiction. Clayton's 2025 Annual Drinking Water Quality Report, covering "Town of Clayton - North" (water system number NC 40-51-019), contains no PFAS row anywhere in its tables.

That report and the EPA UCMR5 record (PWSID NC0351020) are two distinct Town of Clayton drinking-water system records. A missing PFAS line in one doesn't cancel out a detection in the other, and the two shouldn't be merged into a single claim either way.

Does boiling water remove PFAS from Clayton tap water?

No — boiling does not remove PFAS, and it can concentrate it. PFAS compounds don't evaporate the way water does, so as a pot boils down, whatever PFAS was dissolved in it becomes more concentrated in what's left, not less. It's a common assumption worth correcting before it drives a decision about whether to filter.

What else shows up in Clayton's water besides PFAS?

Real, measurable disinfection byproducts. Clayton's 2025 report puts total trihalomethanes (TTHM) at 52 ppb, ranging as high as 64.2, against an EPA limit of 80 ppb, and haloacetic acids (HAA5) at 30.49 ppb, ranging to 44.3, against a limit of 60 ppb — both compliant, both real.

EPA's National Primary Drinking Water Regulations table lists TTHM's potential health effect from long-term exposure above the legal limit as "Liver, kidney or central nervous system problems; increased risk of cancer," and HAA5's as "Increased risk of cancer."

"Legally compliant" is a ceiling EPA set at the edge of its own risk tolerance, not a guarantee of zero risk. These are the exact compounds and effects EPA had in mind when it drew that line, and a carbon stage removes them directly rather than relying on staying under it.

What actually removes PFAS from Clayton tap water?

Carbon certified for PFAS, or reverse osmosis. PFOA and PFOS need activated carbon certified to NSF/ANSI 53 or P473, or reverse osmosis certified to NSF/ANSI 58 — a basic pitcher filter or uncertified carbon isn't tested against either standard.

A water softener alone does nothing here. It's ion exchange for calcium and magnesium, with no mechanism for pulling PFAS, TTHM, or HAA5 out of water. An all-in-one whole-home system pairs a PFAS-rated carbon stage with softening resin, so the carbon side handles PFAS and disinfection byproducts while the softening side protects your water heater, dishwasher, and plumbing from mineral buildup — one install, both problems solved.

For the region-wide mechanics of how that carbon stage works, see our Triangle NC PFAS & Forever Chemicals Explainer. For local install pricing, see water softener cost in Clayton, NC.

Get your Clayton address tested, not just the system average

EPA's own monitoring already shows PFOA and PFOS present in the Clayton system, on top of the disinfection byproducts already documented in the town's own 2025 report. Take the 60-second water quiz to see which all-in-one system fits your Clayton home, or book a free water analysis for your own address's numbers. For local installation, see who installs water softeners in Clayton, NC.

FAQ

Did Clayton violate a water quality law with these PFAS numbers? No. EPA's UCMR5 program collects nationwide occurrence data — it isn't compliance testing, so there's no violation to report. Two of Clayton's three 2024 sampling rounds sit above the 4.0 ppt MCL that now applies to PFOA and PFOS, which is worth knowing, but that's a comparison against a limit, not a legal breach.

I just moved to Clayton and can't find PFAS mentioned in the town's water report — does that mean it's not there? Not necessarily. Clayton's 2025 report, for the "Town of Clayton - North" system, doesn't include a PFAS row, but that's a separate system record from the EPA UCMR5 monitoring (PWSID NC0351020), which detected PFOA and PFOS in two of three 2024 rounds. A free water analysis settles it for your own address.

I've been boiling my tap water because I'm worried about PFAS in Clayton — is that helping? No, and it may make things worse. PFAS doesn't evaporate with steam, so boiling concentrates whatever PFAS was already in the water rather than removing it. Carbon certified to NSF/ANSI 53 or P473, or reverse osmosis certified to NSF/ANSI 58, are the methods that actually remove it.

Will my water softener take care of the PFAS in Clayton's water? No. A softener is ion exchange built specifically for calcium and magnesium — it has no mechanism for PFAS, TTHM, or HAA5. Those require a carbon stage rated for PFAS or reverse osmosis; an all-in-one system pairs that carbon stage with softening resin so both are handled in one unit.

Why did Clayton's PFAS levels rise between January and June 2024, then disappear by October? The dataset doesn't explain the cause, and that kind of round-to-round change isn't unusual in occurrence monitoring. What it does show is real variation — non-detect isn't guaranteed every round, which is exactly why a carbon stage rated for PFAS removal is a more reliable answer than hoping a given month tests clean.

Is it worth testing my own Clayton address if EPA already tested the system? Yes — EPA's UCMR5 sampling reflects the system's entry point, not necessarily what comes out of your specific tap after your home's own plumbing. A free water analysis gives you a number tied to your actual address, plus a system sized to it.

Sources

• EPA — UCMR5 Occurrence Data (Unregulated Contaminant Monitoring Rule)
• Town of Clayton — 2025 Annual Drinking Water Quality Report
• EPA — National Primary Drinking Water Regulations
• EPA — Proposed PFOA and PFOS Compliance Extension Rule

Related reading: Triangle NC PFAS & Forever Chemicals Explainer | Who Installs Water Softeners in Clayton, NC | Water Softener Cost in Clayton, NC | Does Durham, NC Water Have PFAS?