Well Holly Springs gets water from Lillington. Here is a notice about them changing the way they treat water on March 1st.
http://www.harnett.org/downloads/Chl...tice013112.pdf
Be interesting to see if your experience changes after then. Also you may want to check with your neighbors and see if they have similar complaints. I have Holly Springs water and don't really notice a problem with it, but then again I grew up on Harnett County water so it seems the way it has always been to me.