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I am located in Florida. I have an irrigation well and when I open the valve for the pipe that is on the top of the well, the water is under pressure.

Pump is mounted on the side and is a surface mounted jet pump. Well is probably less than 25 FT deep.

Why am I seeing water under pressure from the well?

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    Where in Florida is the well? Commented Apr 8, 2023 at 15:02

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An artesian well brings water up to the surface without pumping. This is because the water in the underground reservoir is under pressure because it has water in the water-bearing layer at a higher altitude, and is not able to escape before you drill down into the layer. These are encountered in many areas of the world.

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    +1! You can self-delete your now duplicate comment on the OP. ;)
    – FreeMan
    Commented Apr 8, 2023 at 12:02

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