Plans for a new changing rooms and clubhouse at the rugby club in Virginia have been refused by An Bord Pleanála because of concerns over wastewater treatment.
Inland Fisheries Ireland had appealed the plans in August after they had been granted approval by Cavan County Council.
Virginia RFC had applied to demolish the existing clubhouse and temporary accommodation and replace them with a new permanent, two-storey building.
It had been given approval by the County Council, subject to conditions, but this was appealed by Inland Fisheries Ireland.
It has raised concerns about a number of separate developments in Virginia because of a lack of capacity at the local waste water treatment plant.
It has said it's concerned about the quality of the water in nearby Lough Ramor, which it says is already below acceptable standards.
An Bord Pleanála has now decided to refuse planning permission.
Among the reasons behind its decision it cited the existing constraints at the wastewater treatment plant and the number of approved developments which have not started construction.
