So-called "forever chemicals" have been found at a number of sample sites across Dublin Airport's campus.
It's thought dozens of sites across the country could be contaminated with the potentially dangerous substances.
These findings follow a two-year investigation at Dublin Airport into the presence of PFAS, that have been linked globally to health issues including cancers and infertility.
Daa says the chemicals were discovered as expected in surface water, ground water, soil, and concrete samples.
Some of the highest concentrations were found at the airport's former fire fighting training ground where PFAS foam had been used until 2013.
It says it will continue to monitor the issue and will develop a number of management and remediation options to deal with PFAS where they are found.
The chemicals have been used in a number of products for decades including waterproof clothing and frying pans, with landfills and pharma plants among the sites contaminated with the substances worldwide.
