A key defendant in an illegal dumping case had made a donation of €6,000 in the form of a cheque to Fianna Fáil, the Green Party leader, Mr Trevor Sargent, claimed.
He said that a waste company would face charges this summer of allegedly dumping without a licence in ways which caused damage to the environment.
"This company was partly responsible for allegedly creating the largest illegal dump to be discovered in this country to date."
The Taoiseach, Mr Ahern, said he had no information on individual donations and was not answerable to the House on that.
He added that the Government had put in place the Office of Environmental Enforcement to enhance environmental compliance through the enforcement of EPA licences and by an enhanced supervisory role in respect of local authorities.
"That work is legislated for and is focused heavily on the area of waste," he said.
Earlier, Mr Sargent said that a columnist in The Irish Times had described the lack of compliance with planning law in Ireland as a sick joke.
"This observation follows last Monday's Prime Time programme, comments by the Ombudsman today about the reluctance of local authorities to pursue infringements of planning law."
Insisting that the legislation was "stringent", Mr Ahern said he did not think it was true, as was being implied, that the Minister was easing or amending legislation to suit somebody.
"No Government would do that. We have tough laws and powers to strengthen the legislation and we are doing that."
The reason some of the dumps existed was because there were hardly any laws, regulations and enforceability.
"We now have the EPA, tough laws and the resources, and that is why the issues are being dealt with."
