Does Durham, NC Water Have PFAS? What the City's Own Data Shows

Triangle Waterworks · informational guide

Direct answer: Yes. Durham's own PFAS page reports PFOA and PFOS in its finished water, with readings as high as 5.5 ppt and 9.2 ppt — above EPA's new 4 ppt limit for each, though Durham still meets every current compliance deadline. Its water also carries measurable disinfection byproducts. A whole-home system with PFAS-rated carbon plus softening resin addresses both — start with a free water analysis at your address.

Does Durham, NC water have PFAS?

Yes, according to the City's own reporting. Durham operates its own utility — Durham Water Management, drawing surface water from Lake Michie and Little River Reservoir and treating it at the Williams and Brown Water Treatment Plants — and it has published a dedicated PFAS page confirming both PFOA and PFOS show up in its finished water.

Durham has monitored for PFAS since 2018. Across testing from February 2018 through February 2025, the city reports PFOA between 2.4 and 5.5 parts per trillion (ppt) and PFOS between 3.7 and 9.2 ppt. GenX and PFNA haven't been detected; PFHxS and PFBS have, but stay below the combined Hazard Index threshold EPA uses for PFAS mixtures.

How much PFAS is in Durham's tap water?

Durham's 2025 Annual Drinking Water Quality Report lists the same family of compounds under its "Unregulated Contaminants" table, with a full year of 2025 sampling: PFOA averaged 3.8 ppt (range 2.8–5.7 ppt) and PFOS averaged 5.6 ppt (range 4.6–7.2 ppt) across four quarterly samples. PFBS averaged 5.9 ppt (range 3.1–7.7 ppt) and PFBA averaged 2.2 ppt (range 2.0–3.5 ppt).

Durham's PFAS page states that testing "shows a range of PFAS levels both below and above the MCL of 4 parts per trillion," while also stating "Durham Water currently meets all state and federal regulations for drinking water." That's not a violation — EPA's rule gives systems until 2029 for treatment — but it's Durham's own admission that individual samples have exceeded the number that will eventually be enforced.

What are the current EPA limits for PFOA and PFOS?

EPA's 2024 PFAS National Primary Drinking Water Regulation sets enforceable Maximum Contaminant Levels of 4.0 ppt each for PFOA and PFOS, and 10 ppt each for PFHxS, PFNA, and HFPO-DA (GenX), plus a Hazard Index limit for mixtures of those four. Public water systems must finish initial monitoring by 2027 and have treatment in place by 2029 if levels exceed the limits.

A rule proposed by EPA in May 2026 would let eligible systems request two extra years — to 2031 — for PFOA and PFOS. Public comment on that proposal closed July 20, 2026, but the rule hasn't been finalized, so 2029 remains the current standard.

Is Durham's water safe to drink if it's legally compliant?

Legally compliant and zero-risk are not the same thing. "Compliant" means Durham hasn't violated an enforceable limit — and as of today, PFOA and PFOS aren't yet enforceable limits for systems like Durham's, only monitoring requirements are. It doesn't mean every sample stayed under the number that will apply once enforcement starts in 2029.

The same logic applies to Durham's disinfection byproducts. The city's 2025 report shows Total Trihalomethanes (TTHM) at a highest running annual average of 56 ppb, with individual samples ranging 26–54 ppb, against an EPA limit of 80 ppb. Haloacetic acids (HAA5) came in at 49 ppb, with individual samples 13–48 ppb, against a limit of 60 ppb. No violations were reported for 2025.

EPA regulates TTHM and HAA5 for a specific reason, not a cosmetic one. 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." Those are the exact compounds and effects behind the legal ceiling — a carbon filtration stage removes them rather than counting on staying under the limit.

Does boiling water remove PFAS from Durham's tap?

No — boiling does not remove PFAS, and it can concentrate it. Boiling evaporates water while PFAS compounds stay behind, so the PFAS in the water you're left with can end up more concentrated than what came out of the tap, not less. It's a myth worth killing before it drives someone's decision on whether to filter. We cover the mechanism in more detail in does boiling water remove PFAS.

What actually removes PFAS, chlorine byproducts, and hardness from Durham water?

Three problems, two treatment technologies:

• PFOA and PFOS need activated carbon certified to NSF/ANSI 53 or P473, or reverse osmosis certified to NSF/ANSI 58. Uncertified carbon or a basic pitcher filter isn't tested against these standards and shouldn't be assumed to work.
• TTHM and HAA5 (disinfection byproducts) and chlorine/chloramine taste are removed the same way — by an activated carbon stage.
• Water softeners are ion exchange for calcium and magnesium only. They do nothing for PFAS, chlorine, or disinfection byproducts — a softener alone leaves all three untouched.

A whole-home system that pairs a PFAS-rated carbon stage with softening resin is the "best of both worlds" answer: the carbon side handles PFAS and disinfection byproducts, the softening side protects your water heater, dishwasher, and plumbing from mineral buildup over time. Read the deeper breakdown in how to remove PFAS from drinking water and does activated carbon remove PFAS.

Where does Durham's water come from, and why doesn't the city publish a hardness number?

Durham draws from Lake Michie and Little River Reservoir, two surface-water sources, and also purchased supplemental water from the Town of Cary during 2025. Its 2025 Annual Drinking Water Quality Report is thorough on lead, copper, disinfection byproducts, nitrate, and PFAS — but it does not publish a hardness figure anywhere in the document.

That's genuinely useful to know rather than a reason to guess. Without a published number, borrowing a figure from Raleigh, Cary, or any other utility would be inaccurate — Durham runs its own source water and its own treatment plants, with its own mineral profile.

The only way to get an honest hardness reading for a Durham address is to test it, either with a Hach Total Hardness Test Kit, Model 5-B (Drop Count Titration) at home, or with a free water analysis that also confirms what your specific tap carries for PFAS and disinfection byproducts. Our guide on testing tap water for PFAS walks through what a real test involves.

Should Durham homeowners install a water treatment system?

Given what Durham's own reporting shows — PFOA and PFOS present with individual readings above the future 4 ppt limit, TTHM and HAA5 both measurable, and no published hardness figure to rule out mineral buildup — this is worth addressing now, not waiting on 2029 enforcement to force the issue. A whole-home system built around a PFAS-rated carbon stage plus softening resin handles the water quality question and the hardness question together, in one install.

Get your own address tested, not just the city average

The city's testing shows PFOA, PFOS, TTHM, and HAA5 in Durham's supply. A free water analysis gives you your own address's numbers and a treatment plan sized to them — take our 60-second water quiz or book the free analysis today rather than waiting for 2029's enforcement deadline to decide.

FAQ

I just moved to Durham from a town with a published hardness number — why can't I find one for Durham? Durham's own Annual Drinking Water Quality Report doesn't include a hardness figure, and Durham runs its own surface-water system rather than sharing a utility with a neighboring town, so borrowing another city's number wouldn't be accurate. A free water analysis or a Hach Total Hardness Test Kit, Model 5-B is the only way to get a real reading for your specific address.

Does Durham meeting all state and federal regulations mean the water is PFAS-free? No — it means Durham hasn't violated an enforceable limit, and PFOA/PFOS aren't yet enforceable for systems like Durham's until 2029. Durham's own PFAS page reports individual PFOA and PFOS readings above the 4 ppt standard that will eventually apply, even while the utility stays in compliance today.

I filled a pot with tap water and boiled it before making formula — did that get rid of any PFAS? No. Boiling doesn't remove PFAS, and because boiling evaporates water while PFAS stays behind, the PFAS that remains can end up more concentrated, not less. If PFAS is a concern, the fix is carbon filtration certified to NSF/ANSI 53 or P473, or reverse osmosis certified to NSF/ANSI 58 — not heat.

Will a water softener take care of the PFAS Durham's report mentions? No. A softener is ion exchange for calcium and magnesium — it does nothing for PFOA, PFOS, chlorine taste, or disinfection byproducts. Those require an activated carbon stage or reverse osmosis; a whole-home system pairs that carbon stage with softening resin so both are handled in one unit.

What's the difference between the PFAS numbers on Durham's PFAS page and the numbers in its Annual Water Quality Report? The PFAS page reports a wider testing window — February 2018 through February 2025 — while the Annual Report's "Unregulated Contaminants" table covers just the four quarterly samples taken in 2025. Both come from the same utility and show the same two compounds, PFOA and PFOS, with the annual report's 2025 averages falling within the PFAS page's longer-term range.

Is it worth testing my own water if the city already tests theirs? Yes — city reports reflect samples taken at monitoring points across the distribution system, not necessarily what comes out of your specific faucet after your home's own plumbing. A free analysis gives you a number tied to your actual address instead of a citywide figure.

Sources

• City of Durham — 2025 Annual Drinking Water Quality Report
• City of Durham — PFAS Drinking Water Standards
• EWG Tap Water Database — City of Durham (PWS NC0332010)
• 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

Related reading: Water Softener in Durham, NC | How to Remove PFAS from Drinking Water | Does Activated Carbon Remove PFAS