What Are PFAS Forever Chemicals in Triangle, NC Tap Water?

Triangle Waterworks · informational guide

Direct answer: PFAS ("forever chemicals") are man-made fluorinated compounds that resist breakdown and build up; EPA caps PFOA and PFOS at 4.0 parts per trillion in tap water. Cary, Apex, and Morrisville draw from PFAS-affected Jordan Lake; Raleigh Water draws from a separate reservoir, Falls Lake, so your exposure depends on your utility. Only PFAS-certified carbon or reverse osmosis removes it — why a whole-home system pairs that carbon stage with softening.

What exactly are PFAS, and why are they called "forever chemicals"?

PFAS (per- and polyfluoroalkyl substances) are man-made fluorinated compounds used since the 1940s in nonstick cookware, stain-resistant fabric, firefighting foam, and food packaging. The carbon-fluorine bond that makes them heat-, water-, and grease-resistant also makes them nearly indestructible in the environment.

EPA's PFAS National Primary Drinking Water Regulation, finalized in April 2024, sets enforceable Maximum Contaminant Levels of 4.0 parts per trillion each for PFOA and PFOS. Four more — PFHxS, PFNA, HFPO-DA (GenX), and PFBS — are addressed through individual limits or a combined Hazard Index for mixtures, though EPA has proposed rescinding those four determinations; that does not touch the PFOA/PFOS limits.

Water systems have until April 2029 to meet the PFOA/PFOS MCLs, though EPA has proposed — not yet finalized — extending that to April 2031.

Why does Jordan Lake have a documented PFAS history?

Because Duke University researchers measured it. In 2017, Duke's Nicholas School found the collection of related fluorinated compounds in raw, untreated water from B. Everett Jordan Lake — the Cape Fear River Basin reservoir supplying Cary, Apex, and Morrisville — added up to 100 to 200 parts per trillion. Cary's utility confirmed the finding.

Coverage framed it as a watershed story, not a plant failure — no single factory was identified, and researchers pointed to diffuse residential and wastewater sources. The Cary/Apex Water Treatment Facility, the 56 MGD plant Cary operates and co-owns with Apex, treats that Jordan Lake water with powdered activated carbon at the raw-water pump station, ozonation, coagulation, and sand/carbon filtration, before chlorine and ammonia are added in the clearwell to form chloramines.

Apex's own 2024 water quality report shows PFOS, PFOA, PFHxS, PFNA, and PFBS all came back non-detect.

Two shorter-chain compounds still showed up — PFBA at 3.8 ppt (ND–7.6) and PFHxA at 3.65 ppt (3.3–4.0) — both unregulated. Cary's EWG Tap Water Database entry, from the same source lake, lists PFOA at 2.86 ppt and PFOS at 3.79 ppt — both under the 4.0 ppt MCL but measurable.

Does Raleigh Water have the same PFAS story as Cary and Apex?

No — a distinction often missed. Raleigh Water draws from Falls Lake on the Neuse River, treated at the E.M. Johnson Water Treatment Plant — a different reservoir and river basin from Jordan Lake and the Cape Fear. Raleigh also supplies Garner, Knightdale, Rolesville, Wake Forest, Wendell, and Zebulon — the same distinction applies there.

Raleigh's own PFAS data page states concentrations "have usually ranged from non-detectable to 4 ppt (PFOA) and non-detectable to 5.5 ppt (PFOS)" since 2013 — so the PFOS figure has touched just above the 4.0 ppt MCL at that range's top. Raleigh Water says it "is committed to complying with all PFAS regulations."

The city's most recent published results run lower than that historical top end. Raleigh's 2025 Perfluorinated Compounds Data Results show finished water at its two plants testing 1.15–2.98 ppt PFOS and 2.21–2.94 ppt PFOA across four quarters — every result under the 4.0 ppt limit, and each a real detection rather than a non-detect.

There's no single "Raleigh PFAS number" the way there's one Apex or Cary figure above; the City reports a range. The most current figure for your household is worth reading in Raleigh's own report, not borrowed from a neighboring town.

Every figure above complies with EPA's 4.0 ppt MCL. Cary's numbers do exceed the EWG's far stricter, non-regulatory health guideline — a separate benchmark, not the legal limit.

How do I check the PFAS level for my own address and utility?

Start with your utility's own Consumer Confidence Report, published annually on its website — every public utility in North Carolina is required to post one. If yours isn't Raleigh, Cary, or Apex, the EWG Tap Water Database lets you look up your utility's most recent results by ZIP code or system name.

For a reading tied to your own tap rather than a plant average, see our guide on testing your tap water for PFAS, which covers lab test kits and what a free water analysis checks for.

If my utility shows low or non-detect PFAS, do I still need to filter?

Yes — non-detect PFAS is good news, but it answers only one question. Every utility named above still runs a disinfectant residual, still produces disinfection byproducts, and still delivers water with hardness that accumulates in a water heater and on fixtures over years.

EPA doesn't regulate TTHM and HAA5 for taste. Its own National Primary Drinking Water Regulations table lists TTHM's potential health effect from long-term exposure above the MCL as "liver, kidney or central nervous system problems; increased risk of cancer," and HAA5's as "increased risk of cancer."

Every utility here is legally compliant. But compliant is a ceiling EPA itself set, not a guarantee of zero risk — and a carbon filtration stage removes those compounds rather than relying on staying under a limit.

Does boiling water remove PFAS?

No. PFAS compounds don't break down at boiling temperature — boiling only removes water itself as steam, so the PFAS left behind actually concentrates rather than disappearing. That's the opposite of boiling's effect on bacteria. Full breakdown: Does Boiling Water Remove PFAS?

What actually removes PFAS from tap water?

Two treatment types are certified to reduce it: activated carbon certified to NSF/ANSI 53 or P473, and reverse osmosis certified to NSF/ANSI 58. Softening resin, certified under NSF/ANSI 44, is ion exchange built for calcium and magnesium — it was never designed to touch PFAS and doesn't.

Basic carbon certified only to NSF/ANSI 42 handles chlorine taste and odor, but that isn't the same certification as PFAS-rated carbon. The certification number is what to ask for, not just "carbon filter."

An all-in-one whole-home system pairs a softening stage with a carbon stage built to that PFAS-rated certification, protecting your water heater from scale while also handling PFAS, chlorine/chloramine taste, and disinfection byproducts — whichever Triangle utility serves your address.

Go deeper in How to Remove PFAS from Drinking Water and Does Activated Carbon Remove PFAS from Water?. For broader removal, Is Reverse Osmosis Water Bad for You? The Real Answer covers when RO makes sense alongside or instead of carbon.

Get the reading that actually applies to your address

Jordan Lake and Falls Lake are two different watersheds with two different stories, and a townwide average still isn't the number from your own kitchen tap. That gap is worth closing now.

Take our 60-second water quiz to see which all-in-one system fits your home, or book a free water analysis for the exact reading at your own address — Raleigh Water, Cary, Apex, or anywhere else in our service area.

FAQ

I live in Cary but my neighbor in Raleigh says their water tested completely different for PFAS — why? Because you're on different watersheds entirely. Cary draws from Jordan Lake in the Cape Fear River Basin, where Duke researchers documented elevated PFAS in the raw source water in 2017; Raleigh draws from Falls Lake on the Neuse River, a separate reservoir with its own testing history. The two towns' numbers aren't comparable.

I just moved to Apex from out of state — is Apex's water actually clean, or are they just not testing for everything? Apex tests the full current EPA PFAS panel, and its 2024 report shows PFOS, PFOA, PFHxS, PFNA, and PFBS all non-detect, with two smaller unregulated compounds in the low single-digit ppt range. That's genuinely clean on the regulated compounds — it just doesn't cover chlorine taste, disinfection byproducts, or hardness, which every Apex household still has.

Does a Brita or other pitcher filter remove PFAS? Most pitcher filters use basic carbon that isn't certified to NSF/ANSI 53 or P473, the certifications that actually apply to PFAS reduction — check the box for that exact number rather than assuming any carbon filter qualifies. A whole-home system with PFAS-rated carbon covers every tap, not just the pitcher.

Is the PFAS level in Triangle tap water actually dangerous? Every utility covered here reports levels legally compliant with EPA's 4.0 ppt MCL. Compliant isn't the same as zero, though — PFAS accumulates in the body over time, which is why EPA regulates it at the trillion-level scale it does, and why certified filtration exists for households that want to go beyond the legal floor.

How often does my town actually test for PFAS? Public water systems test on a schedule set by EPA's monitoring rules, with results reported in each utility's annual Consumer Confidence Report and, currently, EPA's UCMR5 program. Check your own utility's most recent CCR for the exact testing dates behind any figure you're comparing.

Can I get my own tap water tested for PFAS instead of relying on the town's average? Yes — a lab test kit or a free water analysis gives you a reading specific to your address rather than a systemwide average, and results can vary across a distribution system. Our guide on testing your tap water for PFAS covers both options.

Sources

• EPA — Per- and Polyfluoroalkyl Substances (PFAS), National Primary Drinking Water Regulation
• EPA — Proposed PFOA and PFOS Compliance Extension Rule
• EPA — National Primary Drinking Water Regulations
• WRAL — Elevated levels of perfluorinated chemicals found in Jordan Lake, Cary drinking water
• Town of Apex — 2024 Annual Drinking Water Quality Report
• EWG Tap Water Database — Town of Cary (PWS NC0392020)
• City of Raleigh — Perfluorinated Chemicals Data and Information
• City of Raleigh Water — 2025 Perfluorinated Compounds Data Results
• City of Raleigh — Water & Wastewater Treatment Plants (E.M. Johnson WTP, Falls Lake)
• NC DEQ — E.M. Johnson WTP, Neuse River Basin

Related reading: Who Installs Water Treatment Across Raleigh, Cary, Apex, Morrisville, and Wake Forest | Water Hardness by Town in the Triangle, NC | Does Activated Carbon Remove PFAS from Water?