A former dangerous chemical site is no longer the responsibility of Flintshire Council.
Colin Everett, authority chief executive, confirmed that the disposal of the former Euticals site had been completed.
Potentially dangerous chemicals and caustic acid were left at the base when the company went into liquidation in July 2013.
Mr Everett told members of the cabinet that the site's disposal was completed last week following a behind-closed-doors meeting between members that ratified that responsibility for the Prince William Avenue should be done away with.
The site was used for the processing of chemicals, most notably Isosorbide Dinitrate (ISDN) a drug used for the treatment of angina.
Shortly after announcing its parent company had withdrawn financial support, Euticals went into liquidation and effectively abandoned the site.
Since that time Flintshire Council, in conjunction with specialist advisors has been working with the emergency services, regulatory bodies and Welsh Government to clear the external areas of chemicals and other substances.
Mr Everett said: “This was a unique situation not of our own making and now we can move on from it.”
It is not clear how much Flintshire Council has spent in total on the site, however in 2014 they said they were paying £60,000 a month to manage the clean-up of the site.
The figure included policing of the area as well as removal of potentially harmful chemicals. Police officers were regularly seen stationed outside the site of the former factory due to the public protection risk.
In 2014, Euticals Ltd and previous site operators Archimica Chemicals Ltd were fined a total of £120,000 after workers at the plant suffered life-changing conditions by being exposed to a poisonous gas.
Euticals admitted allowing chemicals to escape from the site and failing to notify the authorities when it occurred.
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