Originally Posted by P2C
It is not unusual for houses of yesteryear to be built without a percolation system. They would of had a soak pit which would or could block. Any house over 20- 25 years in rural Ireland probably needs a serious update. The council now demand a modern treatment system, reed beds, percolation systems and other requirements and with planning, consultant fees etc can cost a lot. I would go back to the vendor and tell them the bank won’t lend due to the issue but if they rectify same etc you can but. But your talking circa 6-10k
Entirely depends on the drainage conditions for the septic tank and percolation area or some other system. The percolation area sizing required is based on the number of bedrooms. Per EPA regs, 1 bed is a minimum of 2 Population Equivalent (PE), 2 bed is 4 PE, 3 bed is 5 PE, 4 bed is 6 PE and so on. There's also minimum separation distances from buildings, boundaries, water sources and so on. And unless planning permission can be got, then it's a pig in a poke.
Edit: just seen the site is 0.34 acres, so pretty tight. Definitely needs the water supply not to be from a well, or neighbouring wells close by.