A friend got tired of dealing with the sulphur in his drilled well water.
He lives in bottom land, and knew the water table wasn't very deep.
So, he dug a deep hole with his backhoe. It filled up with water.
He then filled the hole with crushed limestone and a slotted pipe.
Added a pipe, and was in business. And, no sulphur.
Stuvwxzy,
I can see what you are thinking
And,
I share your concerns, it may be under the "surface",
But he is probably drinking surface water