My current well pump is set at 400' and it goes dry in summer, with a small pressure tank and a dole flow valve I can get .5 gpm to a cistern. This summer that is going dry as well.
Going to have a new well drilled to 625' pump set around 500' depending on static level, question is can I use sched. 80 the whole distance, if not galvanized at the top with pvc below? (I have 400' of galvanized about 5 yrs old in old well)
Would punch the old hole deeper but pumphouse is on top of it plus an extra set up fee from the driller. Beside that I have grown very tired of that hole! Thanks

Don't know what the depth limit would be for PVC. Have you researched the use of flexible well pipe?

No, I have not, my concerns with that is the connections. I will give it a look. Thanks!

What connections? All one length. One brand showing 1" has 3000# tinsel strength another 1650.
http://www.ohiowater.org/otco/new%20site/docs/presentations/2013/Water_Workshop/Day_2_Groundwater/Economic%20Benefits%20of%20Flexible%20Drop%20Pipe. pdf

Connections would be my concern with PVC.

Looks like good stuff, can a pitless be used? One check valve at the pump with the break off for pump removal? Is there a torque arrestor and spacers to keep wire and hose from chaffing on casing? Where can a guy get this stuff? Pump has a 1 1/4" outlet, 1" flex pipe o.k. And... cost? Thanks for your time. Definitely a option. Thanks!