The Temploni landfill, which has been operating in breach of EU waste regulation since 2007, is a “serious risk for human health and the environment”, the Commission said.
Various inspections by national authorities found the landfill is operating “very poorly”, it adds.
This includes improper management of biogas, not treatment liquid draining from the landfill and the presence of waste which the site is not permitted to treat.
The Commission expressed its concerns in a letter of formal notice in March 2011.
It states: “Although the Greek authorities have recognised this issue and are trying to address it, the necessary measures have still not been taken and the landfill continues to operate in breach of EU waste legislation, constituting a serious threat to the environment.”