If you lived in a house for 20 years with well water, and water is no longer being pumped up, what is the more likely reason for this and what would you need to do to fix it?

the water in your well has become contaminated and you need to hire a professional to shock treat the water to make it safe to treat.

a cone of depression has formed and the well will need to be drilled deeper to reach the water table.

your well was originally below a perched water table and you now need to find a new spot to drill.

your well has run dry because of cracks in the artesian spring and you need to relocate your well.