PFAS are a large group of stable synthetic chemicals. They matter because they persist in soil, water, wildlife and human tissue. Studies link some PFAS with raised cholesterol, kidney and testicular cancer, liver effects, thyroid change, reduced vaccine response and harm in early life (National Academies of Sciences, Engineering, and Medicine [NASEM], 2022; U.S. Environmental Protection Agency [EPA], 2024). The key issue is not whether PFAS are “present” or “absent”, but the likely dose, duration and route of exposure.
Non-stick frying pans usually pose the lowest direct risk of the three cases considered here, when they remain intact and are not overheated. A PTFE-coated pan can start to give off hazardous gases if heated empty to about 360°C (German Federal Institute for Risk Assessment [BfR], 2025). That is above most normal frying, although empty pans can heat fast. Evidence on PFAS moving from PTFE cookware into food remains limited, and one recent review notes no clear evidence that perfluorochemicals migrate from PTFE cookware into a food simulant under tested conditions (Cole et al., 2024). The more plausible risk lies in flakes, dust, fumes from overheating, older products, and the wider life cycle of manufacture and waste. For a householder, this tends to mean small, sporadic exposure rather than a daily measured dose.
PFAS in aquifers creates a much larger public-health concern because drinking water gives repeated, involuntary intake. A useful comparison is concentration. The UK Drinking Water Inspectorate uses 0.1 micrograms per litre for the sum of 48 PFAS as its main tier-three trigger point. This equals 100 nanograms per litre, or 100 parts per trillion (DWI, n.d.). The U.S. EPA set enforceable limits for PFOA and PFOS at 4 parts per trillion each in 2024 (EPA, 2024). On that scale, the UK tier-three point is 25 times the EPA limit for either PFOA or PFOS, although the two systems do not measure exactly the same thing. Where local groundwater has been described as 43,000 times a recommended safe level, that implies an extreme source-zone problem rather than a minor trace finding. Even if dilution cuts levels before the tap, aquifer pollution can last for decades and spread through wells, streams and water supply networks.
Excavation near contaminated watercourses creates a different risk profile. It may involve fewer people than drinking water, but workers can face higher short-term contact with wet soil, trench water, sediment and dust. NIOSH notes that workers may touch more concentrated PFAS materials or breathe PFAS in workplace air (National Institute for Occupational Safety and Health [NIOSH], 2024). Occupational reviews also find that workers who handle PFAS-rich materials can have higher exposure than the general public (Christensen et al., 2023). Soil at such sites may hold PFAS in micrograms per kilogram or milligrams per kilogram, depending on the source. That is not the same unit as drinking water, but it shows why dust control, gloves, washing facilities, decontamination, groundwater control and site testing matter.
The comparison is therefore stark. A pan can be replaced and, under normal use, gives a limited route of exposure. A polluted aquifer can dose a whole area each day through drinking water. Excavation adds a high-contact work risk, which should never rely on caution by the worker alone. The main duty lies with polluters, landowners, water firms, employers and regulators, not with residents or workers asked to manage hidden hazards by guesswork.
References
Christensen, B. T., Salvatore, A. L., & Stapleton, H. M. (2023). Occupational exposure to per- and polyfluoroalkyl substances. Current Environmental Health Reports, 10, 159–170.
Cole, M., Lindeque, P. K., Fileman, E., & Galloway, T. S. (2024). Microplastic and PTFE contamination of food from cookware. Science of the Total Environment, 919, 170898.
Drinking Water Inspectorate. (n.d.). PFAS and forever chemicals.
German Federal Institute for Risk Assessment. (2025). Selected questions and answers on cookware, ovenware and frying pans with a non-stick coating made of PTFE. (https://www.bfr.bund.de/en/service/frequently-asked-questions/topic/selected-questions-and-answers-on-cookware-ovenware-and-frying-pans-with-a-non-stick-coating-made-of-ptfe/)
National Academies of Sciences, Engineering, and Medicine. (2022). Guidance on PFAS exposure, testing, and clinical follow-up. National Academies Press.
National Institute for Occupational Safety and Health. (2024). PFAS and worker health. Centers for Disease Control and Prevention.
U.S. Environmental Protection Agency. (2024). PFAS national primary drinking water regulation.