I am having some land subdivided to build on, and the orig property has 2 wells, one which is not being used. If it is viable, how would I get water from that well to my house, to avoid digging another well? I would first check with the proper authority to be sure of the legality and than notify the present property owner (if any) of course, before any work was attempted.
Can water be pumped from an unused well to a home site
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You can, but it is considered an injection well and is regulated by law:
In the United States, injection well activity is regulated by the United States Environmental Protection Agency (EPA) and state governments under the Safe Drinking Water Act (SDWA). EPA has issued Underground Injection Control (UIC) regulations in order to protect drinking water sources.
You actually have to get a permit and meet specific conditions in order to operate. Not doing so is actual a violation of federal law. The reason for this is you are putting contaminated surface water into the aquifer, and potentially contaminating the drinking water of anyone else connected to that aquifer.
This would be considered a Class V well:
Class V wells are those used for all non-hazardous injections that are not covered by Classes I through IV. Examples of Class V wells include stormwater drainage wells and septic system leach fields.
You should read up from the link above and on the Minimum Requirements for Class V Wells.
If you aren't willing to do all this (because french drains are much simpler..), you should abandon the well. I can't find EPA regulations on this, but here in Ontario, Canada you're actually required to abandon unused wells under the Ontario Water Resources Act, and I'm sure the EPA has similar requirements about unused wells. Well Aware has a good page on Decommissioning unused wells.
If you are fundamentally opposed to (or trying to avoid paying taxes on) an aboveground structure, you could bury a vault to put at least a small pressure tank in. With use of a "constant pressure valve" or a variable-speed "constant pressure pump" you can get away with quite a small pressure tank (2-5 gallons) but you really can't run a pump without any pressure tank, at least not remotely efficiently (you could, I suppose, put a pressure-relief valve in the line at the top of the well, and run without a pressure tank - the excess pressure would recycle water down the well, but that's a terrible waste of power...)
If you really need water in the winter, bury the whole thing below frost line - one common method is to use 4 or 6 foot diameter concrete well tile (as used for shallow dug wells) placed over/around the drilled well casing to provide the frost-free vault - you can insulate the top and sides for better effectiveness. While you have a backhoe in to dig for that and the power line, dig some trenches below frost line to where you want to have hose spigots, and put "frost-free hydrants" at each one (they have a valve at the bottom, and leak away the water in the upright pipe between uses.) Might as well have the backhoe dig 100 holes for trees while you have it, too.
If not fundamentally opposed to a structure, an aboveground structure (small toolshed for the orchard) above the wellhead might be a less expensive approach, unless the local taxing authority makes it an expensive approach after all (that can happen, and is best to be aware of when deciding.) The area with the pressure tank can be heavily insulated and electrically heated to 45F or so if you really need water to hoses in freezing weather, or you can drain the whole system in the fall and start it up again in the spring if you don't really need to use water from hoses in the winter.
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One method would be to subdivide in such a way that you own the well - kinda like a gerrymandered congressional district. The other would be some form of right-of-way - but that does veer off into legal questions we don't address here, so I won't go there. But that assumes many things about its worth that we don't know; Many of which you probably don't, either.
In many cases the presence of two wells on a property, one unused, indicates that the (apparent) "spare" was the first, unsuccessful, well and is disused for a good reason.
Depending on how far the well is from your building site, the cost of trenching and supplying power to the pump can greatly exceed the cost of a new well. Trenches are not cheap, and neither is wire, especially if it has to be large wire because it's a long run. There are many good reasons to keep the connection to the well short and sweet (I kinda liked the house that actually had it in a small extension of the basement, though that can be somewhat difficult to arrange.) If it's a long way from the well to the house there are many more things that can go wrong, simply due to the length of the run providing more access to modes of failure.
To get to the meat of your question, in practical terms, assuming the legalities we don't get into are covered, and the well is worth anything (that's a big one) you have a long trench dug to a depth below (ideally well below) frost line and install pipe (possibly of a larger diameter than you might otherwise use due to length of run) and wires or conduit, and wires in conduit (also possibly of a larger diameter than you might otherwise use due to length of run.) You connect those pipes and wires to the pump in the well on one end, and your plumbing and electrical supply on the other. Backfill with sand for at least a foot, and place tape over the wires indicating Buried Electrical Line Below - refill to within 6" of the surface and place another line of BELB tape just below the surface, then fill to grade.