artesian

Use the adjective artesian to describe water that flows naturally from underground to the surface. An artesian well doesn't require a pump.

When underground water is tapped by boring a well at a certain angle, it creates an artesian well or artesian aquifer. The word artesian comes from the French phrase puits art├ęsien, "wells of Artois," the province in France where artesian wells were originally drilled in the 18th century.

Definitions of artesian
1

adj (of water) rising to the surface under internal hydrostatic pressure

“an artesian well”
artesian pressure”
Antonyms:
subartesian
(of water) rising naturally in a well to a height appreciably above that of the surrounding water table but not flowing out of the well

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