What a good agreement covers
The essentials: who owns the well and the land under it, how electricity and maintenance costs split, who maintains the pump and lines, what happens when repairs are needed, easement rights to access the equipment, and how disputes or usage limits are handled.
Recorded beats handshake, every time. Informal sharing arrangements between friendly neighbors have a way of becoming problems exactly when properties change hands — which is the moment you are entering.
Buyer diligence on shared systems
Read the agreement itself, verify it is recorded, and confirm the practical reality matches the paper: where the well sits, how the lines run, what the cost history has been. Lenders may also want to see acceptable shared-well documentation on some loans.
If the arrangement is informal, fixing it — getting a proper agreement drafted and recorded — can become a condition of your purchase. Sellers motivated to close usually cooperate.
Local rule of thumb: On shared wells, the paperwork is the plumbing — inspect both.