..but not a drop to drink. So goes the saying, and it is something to consider when moving anywhere rural.
Living in cities we can be forgiven for forgetting that the nice clean drinkable water we enjoy is not available countrywide. Due to contamination of water (by either animal or human waste) there is a boil order in place for some parts of County Galway at the moment (Summer/Autumn 2008). You can find specific details here: http://www.myspace.com/galwaywatercrisis and here http://www.google.ie/search?hl=en&q=galway+Cryptosporidiosis+2008
I use this as an example only to emphasize that it is important that you ensure you have a good quality water supply. If the house you intend buying is going to be part of a group water scheme contact the scheme administrator/secretary and ask if there is any upgrade work due to happen, what quality the water is, and if there is or will be meters put in. And of course you will probably want to find out the annual cost, and include this in your sums to work out if you can afford to live there.
If the house has a well, it is well (sorry!) worth the cost of taking a sample and having it tested for quality. If the current owner is reluctant to let you do so, then this should raise your suspisions!
For €85 (at time of writing) you can send off the sample to this crowd for testing : http://www.acornwater.com/showprod.php?id=48