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.