When you shouldn't drill a well

For example, if there is a large amount of water flowing into your house, this water may be coming from an underground spring rather than an aquifer.

If there is a spring, you should not drill a new well because it will disrupt the groundwater flow. It's also not a good idea to drill a well in an arid area because you could disrupt the water table and make it harder for others in the area to get groundwater.

It may also not be a good idea to drill a new well in an area with a high water table because the groundwater is too salty for your daily needs.