They ship to Ireland and the price range is €1-3k, expensive but then again you wont need a septic tank. If you search envirolet on youtube there are lots of useful videos. Envirolet seem to be the biggest company but I also found these guys http://www.separett.eu/default.asp?id=2069&ptid=2052
I dont know what the situation is as regards compliance with the Waste Water Treatment regulations. I emailed the epa about it and they sent me a vague response which left me none the wiser. I know in my own case one of the stipulations of planning permission is that the effluent waste disposal system must be in acordance with epa stipulations.