Louth County Council has confirmed that so far this year it has dealt with 72 separate incidents where toxic sludge, left over by illegal diesel laundering, was dumped.
The council has specialist contractors who recover the sludge and then carefully prepare it to be exported overseas for proper disposal.
So far in 2015 the council has collected 285 large containers, called IBCs, full of the sludge.
The bulk of these are left on the side of the road close to the border with Co Armagh.
Disposal of the sludge cost the taxpayer in the region of €320,000.
The figures reveal a decrease in the problem since last year; in 2014 the council dealt with 106 dumping incidents and collected 454 IBC.
The total cost for 2014 was €583,523.
Earlier this year the majority of councillors in Co Louth passed a motion condemning "the IRA and all fuel smugglers along the border."
