Hello all I've been asking about wells recently, and I know sort of
where it is, there is a white plastic pipe (around 3" diameter)


I would assume if the pipe is coming out of the ground vertically that
is it.


Not if it's white pvc pipe.. that's more likely to be for
venting the septic, or a groundwater inspection hole,
or something. I'd find where the water-main comes into the
house, and seek outward in a straight line from there.