@snickerish - I went through the same thing! The drought finally put to rest the age old question - Do I keep the water on while I brush my teeth or do I turn the water off? At the time of the drought I went through in NC, people were completely changing their water habits. I never realized how much water I wasted until we did not have enough of it. So far we have not had another scare in my city since then though.
As far as NC's groundwater basin amount, I'm not sure but I do remember from that time that I learned that 50% of the residents of North Carolina both municipal and well users get their water from groundwater basin.