In 2017, researchers at the University of North Carolina Wilmington made a discovery that would upend how the region thought about its drinking water. They detected a novel per- and polyfluoroalkyl substance — a PFAS compound called GenX — in the Cape Fear River and, critically, in the treated drinking water that Wilmington residents had been consuming for years. The source was upstream: the Chemours facility in Fayetteville, a sprawling chemical plant that had been discharging PFAS compounds into the river for decades.
The GenX Discovery
GenX is a fluorinated compound developed by DuPont (and later its spinoff Chemours) as a replacement for PFOA, an older PFAS compound that came under regulatory pressure due to health concerns. The problem is that GenX shares many of the characteristics that make PFAS chemicals problematic: they are highly persistent in the environment, they don’t break down through conventional water treatment, and their health effects are still being studied.
The discovery came through academic research, not regulatory monitoring. Cape Fear Public Utility Authority (CFPUA), which serves Wilmington and surrounding areas, had not been testing for GenX — it wasn’t on any standard testing list. When UNCW researchers published their findings and shared data with the utility, the utility began its own testing and confirmed GenX was present in finished drinking water at measurable concentrations.
Chemours initially declined to disclose the full extent of what it had been discharging into the Cape Fear River. Investigative reporting and state regulatory actions eventually pieced together the picture: the Fayetteville Works plant had been releasing PFAS compounds, including GenX, into the river for decades, going back to the DuPont era. The North Carolina Department of Environmental Quality (NCDEQ) issued demands for discharge data, and what emerged was a history of extensive contamination that the company had not proactively disclosed.
Scale of the Contamination
The Chemours Fayetteville Works plant sits on the Haw River, a tributary of the Cape Fear. Discharges from the facility moved downstream, eventually reaching the intakes used by CFPUA and other downstream utilities. Because PFAS compounds pass through conventional water treatment largely unaffected, they arrived at customer taps.
Testing found not just GenX but dozens of other PFAS compounds in the Cape Fear River and in finished drinking water. Research conducted by NC State University and other institutions documented a complex mixture of fluorinated compounds at various concentrations. Some compounds had no established health standards at all.
GenX concentrations in Cape Fear River water and CFPUA finished water varied seasonally and by river flow conditions, but detections were consistent. A 2018 study in Environmental Science & Technology Letters documented GenX at concentrations in the low parts-per-trillion range in finished drinking water. The EPA had no established Maximum Contaminant Level for GenX at the time.
Regulatory Response
The discovery triggered one of the most significant state-level PFAS enforcement actions in the country. NCDEQ issued multiple enforcement actions against Chemours, eventually entering into a consent order requiring the company to stop discharging PFAS compounds to the river, install treatment on stormwater and process water, conduct groundwater investigation and remediation, and provide alternative water to nearby residents whose private wells were contaminated.
In 2021, the North Carolina legislature allocated funding for PFAS treatment upgrades at CFPUA and other affected utilities. CFPUA has invested in granular activated carbon (GAC) treatment specifically to address PFAS, and the utility began reporting significant reductions in GenX detections after the GAC system came online. The utility has been transparent about testing results, publishing detailed PFAS data on its website.
The EPA proposed a Maximum Contaminant Level for certain PFAS compounds in 2023, with a final rule in 2024 establishing enforceable limits for PFOA, PFOS, and several other PFAS including GenX. This rulemaking was driven in part by the Cape Fear situation.
What the Data Shows Now
CFPUA began publishing quarterly PFAS testing data after the 2017 discovery. After the installation of GAC treatment at the Sweeney Water Treatment Plant, GenX levels in finished water dropped substantially. [NEEDS VERIFICATION: current post-GAC GenX concentrations in CFPUA finished water]
However, the Cape Fear River still receives some PFAS inputs, and the mixture of compounds in source water remains complex. The utility monitors for dozens of PFAS compounds. Some compounds that lack treatment-optimized removal still appear at low levels.
Private wells in areas adjacent to the Chemours plant and in areas with contaminated groundwater are a separate and serious concern. Groundwater sampling by NCDEQ and Chemours has documented PFAS in wells in communities near the Fayetteville plant. Residents on private wells in the Cape Fear basin should not assume their water is safe without testing.
What Residents Can Do
- Request CFPUA’s PFAS data. The utility publishes this online. Review what compounds are detected and at what levels after GAC treatment.
- Test your private well. If you’re on a private well anywhere in the Cape Fear basin, test for PFAS using a certified laboratory that can run a broad panel. The state has provided some well testing assistance in priority areas.
- Follow legislative developments. North Carolina has been one of the more active states in PFAS regulation, and standards and remediation requirements continue to evolve.
- Contact Chemours directly or through NCDEQ if you believe your well is in a contamination plume from the Fayetteville plant. The consent order includes provisions for alternative water supply to affected residents.
- Consider PFAS-specific home treatment. Even if utility water now meets the new EPA MCLs, some residents want additional protection.
Water Treatment Options for PFAS
Conventional carbon pitcher filters (Brita, Pur) are not effective at removing PFAS. Effective options include:
- Granular Activated Carbon (GAC): Effective for PFOA and PFOS; less effective for some shorter-chain PFAS like GenX. CFPUA’s utility-scale GAC has shown strong GenX reduction.
- Reverse Osmosis (RO): Highly effective across a broad range of PFAS compounds. NSF/ANSI 58-certified RO systems are your best under-sink option for PFAS removal.
- Anion Exchange Resin: Emerging as effective for short-chain PFAS that GAC misses. Less common in residential systems.
For Wilmington residents on the municipal supply, the GAC upgrade at the treatment plant has significantly improved the situation. For those on private wells, a certified home RO system is the most practical immediate solution while remediation proceeds.
The Cape Fear PFAS story continues to develop — legally, regulatorily, and scientifically. Residents have reason to stay engaged.
If you are concerned about your water quality, a certified water treatment professional can test your water and advise on solutions.