Where to buy threaded/flush pvc for well casing?

You will only find flush threaded PVC at wholesalers that cater to the drilling contractor. This is NOT what you want anyways. This product is much more expensive than regular PVC pipe. Each piece has to be chucked in a lathe and the male and female threads are machined in each end.

It used to be very common when using PVC pipe for with casing or liner to use regular bell end glue joint pipe. We would additionally add sheet metal screws to each joint to help hold it together as we glued it together and lowered it into the hole. There been more than once that I've been lowering a PVC liner into the well and heard a "whoooosh" as a glue joint pulled apart from the weight of the pipe. Usually about 200 ft down the hole.

Nowadays we normally use Certalock PVC pipe. It is bell and socket, but you don't glue it. It has an o-ring for sealing. Then both the male and female ends have a groove machined in them. There is a hole on the outside of the bell end that you inset a "spline" of PVC to lock the joint together. You will also only find this pipe at wholesale distributors for drilling contractors.

You need to check your states well drilling regulations whether PVC is permissible for casing and under what situations. If it is allowed the regulations will also state the minimum SDR ratio or pressure rating of the pipe. I really prefer 4 1/2" ID PVC instead of 4" PVC, which has an OD of 4 1/2". They Make this casing clear up to a 17.3" OD. It has a wall thickness of over an inch. It's being used instead of 16" steel in California. Not because it's cheaper, it's not. It's being used because it doesn't rust.

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