PVC piping

I found white PVC tubing used as the main water supply line from the well. The only markings found are as follows: American PVC 1120 BP-2, SCH40 ASTM d-1785 370 PSI 73 degree F ASTM D-2665. Does any body know if this is correct tubing to use?

That PVC is fine for the main water supply.

This really depends on your area and plumbing code. It was not legal to use where I plumbed (UPC). I would be more comfortable using a schedule 80 rather than 40 but personally would not use either one. PVC does not handle temperature fluctuations well. It will expand and contract quit a bit.