We have the electric booster and it's used most days throughout winter but we get pretty cold and cloudy here. We also have solar panels to supplement the power and that helps a lot.
That's very astute of you but have you ever had a shower in under two minutes and washed your whole body? There isn't much time to think past the focus of scrubbing, rinsing and ensuring maximum water goes into the bucket.
In my city the water comes from underground too. The problem arises when there is no rain and cleared land produces more runoff than absorbtion.
Coupled with heavy use by people ground water levels are reduced. This not only affects us but trees and plants that rely on these water levels will die off.
However, as the other commenter mentioned, normal citizen use and its affect on this is negligible. It's when you have industrial water extraction that is the real problem.
I didn't know it was that bad! I never really played it but that sounds rough. People suck.