All of my succulents face an East window. I water about once a week, maybe a bit less, every one and a half weeks. 

I live in St. Louis and the windows get pretty hot. I've seen a temperature of 105, but it's usually in the 80s and 90s.

No, tap water is usually fine. Sometimes it causes mineral deposits in plants like jade. This is just what succulents look like when they're thirsty, which is why I asked you how you water your plants.

Would tap water cause this?  Should I leave the water out overnight to declorinate it?

Looks like underwatering. How often and how do you water?

Am I over watering or something else