How are groundwater rights different from surface water rights?
Surface water rights govern diversions from streams, rivers, and reservoirs; groundwater rights govern pumping from wells, and the two run under different rules in almost every state. Texas lets landowners pump nearly without limit under rule of capture, while Arizona, Nebraska, and California's SGMA basins meter and cap pumping.
The main doctrines for groundwater: rule of capture (pump what you can — Texas, with district-level exceptions), reasonable use (pumping must be reasonable relative to the overlying land — many eastern states), correlative rights (overlying owners share the basin — California), and prior appropriation applied underground (permit and priority systems — most of the interior West).
The regulatory direction everywhere is toward management. Declining aquifers like the Ogallala have brought allocation systems to Kansas, Nebraska, and the Texas Panhandle groundwater districts; California's SGMA is phasing in pumping budgets through 2040. A well that pumps freely today may face a metered allocation within the loan term you are considering.
Hydrologically connected ground and surface water is the trap to watch: many states now regulate wells near streams as if they were surface diversions, meaning a junior well can be curtailed to protect a senior surface right. If your parcel relies on a well within a quarter mile of a live stream in an appropriation state, ask a water attorney how conjunctive management applies.
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