Believe it or not, it is a common problem in many areas around Birmingham. The good news is that there is a solution to have them blue again next year. If they are pink and in bloom, there is nothing you can do about it this year. But you can help ensure their giving you a nice blue color next year if you change the pH to a more acid profile. I think the easiest solution is to apply a soil acidifier according to label directions. Follow them carefully, and a more than recommended application will not make them bluer. It is better to do repeated applications than to increase the application amount. So good luck, and if you want blue hydrangeas, use a soil acidifier. Now if you want to keep the pink one pink, I suggest a fall application of 1/3 cup of pelletized lime around each plant. This will help to adjust the soil pH on the basic side, and that gets beautiful pink florist type hydrangea blooms.