Overview
- RIVM reports that earthworms and other soil fauna are a primary pathway moving PFAS from contaminated ground into hobby chickens and their eggs, with outdoor flocks showing the highest levels.
- A Wageningen-assisted review of 801 citizen-submitted, lab-tested eggs finds more than half exceed applicable EU limits, with only about 35.7% below all maximum levels.
- Researchers identify a clear link between more outdoor area per bird and higher PFAS per egg, while higher laying rates are associated with lower PFAS concentrations per egg.
- Spatial patterns show elevated contamination near known industrial sources such as Chemours in Dordrecht and along the Dutch coast.
- Results vary by location and over time; other potential inputs like water, soil, straw, sawdust and coop wood generally test lower than soil fauna, and RIVM’s do-not-eat guidance remains as many sites could exceed intake limits with less than one egg per week.