Which term describes the right of a property owner to use water from a neighboring landowner's supply?

The correct term that describes the right of a property owner to use water from a neighboring landowner's supply is "Riparian rights." This concept is rooted in property law and pertains specifically to landowners whose property is adjacent to a watercourse, such as a river or lake. Riparian rights provide landowners with the right to access and use water that flows past or is situated alongside their property, as long as that use does not significantly harm other riparian owners.

These rights are particularly important because they govern not only the use of the water but also its quality and flow, ensuring that one landowner's use does not infringe upon the rights of others. Understanding riparian rights is essential for navigating issues related to water usage and property boundaries, especially in areas where water resources are shared.

The other options represent different legal concepts: Adverse possession pertains to acquiring ownership of land by continuous use over time, easement by necessity refers to a right of access over a property that is essential for the use of another property, and encroachment rights involve the unauthorized occupation of another's land. None of these relate specifically to the right to use water from a neighboring landowner's supply.