A drilled well is a type of well that has been created with the use of different machines. Since they are machine-made, some of them can be even deeper than 1000 feet. Dug wells are sometimes man-made so they are dug as low as humanly possible.
This is the type of well that was popular way back when people did not have faucets at home. There are still some wells that are being used by industries and some places that are still following traditional ways of acquiring water. A dug well may be more prone to contamination as compared to a drilled well because it is shallower. There is a higher chance that there will be bacteria that may contaminate the water.
Dug and drilled wells are two types of groundwater wells, that supply people with water. Dug wells are formed through excavation of the land area. This is done with a hand shovel until it reaches below the water table. Reaching this point will allow the water to surpass the bailing rate.
Drilled wells can be over 1000 feet deeper than dug wells. They are built with machines, which are used for percussion and rotary drilling. A pump is also used to help push the water up to the surface. Both can experience contamination, but drilled wells are less likely to.