Irish Water/Uisce Éireann have delivered on two new reservoirs in the last few years: Saggart and Stillorgan (technically a rebuild of an 1860s open reservoir). A third, Peamount, is in the planning stage. All of these are around Dublin, the driest and most populated area. Perhaps there are more, their website doesn't make it easy to find them. We still get hosepipe bans, occasional pressure reductions, and frequent "boil notices".

At the other end of the pipe they have opened/upgraded many waste water treatment plants recently too, large EU fines being a motivator, including one in Arklow which took nearly 4 decades to get over the line (its planning predating the existence of IW).