There's a warning that removing the Nitrates Derogation could cost 1 in 8 dairy farmers their jobs.
New figures released by Ibec show that up to €45bn of the Irish economy is at risk, due largely to a reduction in dairy exports.
It comes as the EU enters the final phase of negotiations for the removal of the exemption of the Nitrates Directive for Irish farmers.
The business lobby group are calling for a balancing of "environmental ambition with economic reality".