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If you have a water well that needs to be abandoned, you will typically need a drilling company to help do the job correctly. Many regulations require the well to be pressure injected with a bentonite-cement grout so that the borehole is sealed, then remove the upper pipe. Sometimes the well needs to be overdrilled. Often done under the same permitting process/regulation used to install a well.
If you simply crush in the job or dig and pour concrete in the hole, the deeper portion of the well can remain open. Leaves a direct pathway for crap to get into your drinking water supply.
No, its not cheap or easy. Neither is cleaning up a contaminated water supply.
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