Another rule is, depending upon the state, the length of time the neighbor has been using this well without your written permission. If the neighbor has been using the well on your property for at least 5 years, you have known about their continued use but never restricted their actions then an easement by prescription may have been created. This type of easement does not need to be in writing as it is both an implied easement as well as an easement of necessity.
As far as maintenance of the well - as long as you are not using the well for your own purposes, then you should not have an obligation to maintain or repair it for the easement holders (neighbors).
Now if you should find out that the access to the well is in writing but by license or for a defined period of time then access may be revokable. It depends upon the terms in the license or contact and also if the neighbors have put substantial financial commitment in the reliance of the easement.
That's the best I can do!
There are many other factors and variables that apply that may change my opinion of your position regarding the use of this well but I am not trained in that area of real estate law and you are strongly encouraged to contact a real estate attorney for further advise. Good luck!
Sounds like a legal question to me. Certainly, not one I would trust to agents in an online format. Talk to a Real Estate attorney (specifically a Real Estate Attorney) about the matter. You don't want to leave it to chance.
Even if it's not it writing, it might still be very valid if they have had access for many years.
She's also right about the fact that you really need a great real estate attorney
to work out the details. You can talk with Joe O'Kelley.
His firm is one of the best and largest in Atlanta.
O'Kelley & Sorohan 770.497.1880