The Flood Tribunal is being urged to investigate "improper" land rezoning decisions by Meath County Council.
Councillor Tony McEvoy, an Independent member of Kildare County Council, and Mr Michael Smith, national chairman of An Taisce, have also called on the Minister for the Environment, Mr Cullen, to require Meath County Council to review its development plan.
They have threatened to seek orders of mandamus compelling Mr Cullen to use his powers under Section 27 of the 2000 Planning Act to ensure the Meath plan complies with the Strategic Planning Guidelines (SPGs) for the Greater Dublin Area.
Mr McEvoy and Mr Smith also said they were taking legal advice as to whether to appeal a High Court judgment by Mr Justice Quirke upholding the Meath plan if the Minister failed to give them written undertakings to order the review they are seeking.
The judge made his ruling even though he found that the evidence adduced by them "strongly suggests that in a number of respects the Meath plan does not comply with the guidelines" and that rezoning decisions were "influenced" by lobbying from landowners.
Mr Justice Quirke has since ruled that Meath County Council should pay half of the costs of the judicial review taken by Mr McEvoy and Mr Smith - estimated at more than €300,000 - on the grounds they had taken the action in the public interest.
But the two men, in a statement, said the court's judgment had shown that the SPGs could be "ignored without sanction" by any of the local authorities in the Greater Dublin Area. "The Minister cannot stand idly by while Government policy on curtailing the sprawl of Dublin is flouted", they said.
Mr McEvoy and Mr Smith want the Minister to require Meath County Council to reduce its population targets and zonings which, if left to stand, would result in the population of Meath rising from 133,000 to 196,000 - 1,000 per cent more than the SPGs envisaged. They also want Mr Cullen to direct the council to concentrate development that is currently being dispersed over 33 towns and villages - and the open countryside - into Navan, which was the single growth centre in Meath designated by the SPGs.
Unless this was done, they warned, local authorities throughout the State could equally ignore the "much-vaunted" National Spatial Strategy. Its gateways and hubs would all become "meaningless aspirations in the absence of prescription with teeth".