I need help with outdoor plants dying after watering well water [View all]

I bought a home last spring and we have well water out here. I have a softener, but it is bypassed at the hose. This was such a dry summer for us I watered a few evergreen bushes, and small maple/oak trees to help them out. The bushes began to turn dry in color and die and the smaller maple/oak leaves dried up and fell off in the middle of summer after watering them. The grass in these areas did great, it was the only green grass in my yard I don't think I over watered them, I have a feeling it has something to do with the well water. Has any experienced problems with watering with well water? Any suggestions? Thanks!