How do drought restrictions and curtailment orders actually work?

Question

Turnrow Capital · Accepted Answer

In appropriation states, curtailment runs strictly by priority date: when supply falls short, the state orders juniors to stop diverting, in reverse seniority, until seniors are satisfied. A 1910 right may divert its full decree in a drought year while a 1978 right on the same stream is shut off completely.

The process is administrative and fast. Watermasters or the state engineer track streamflow against decreed demands; when a senior places a "call" on the river or the state issues a curtailment order, junior diverters get notice — sometimes days — to cease. California issued curtailment orders reaching pre-1914 rights on some systems in 2021–2022, which shocked holders who assumed seniority made them untouchable.

Riparian states handle shortage differently: everyone shares the reduction "reasonably," often via state-declared drought stages with percentage cutbacks. Groundwater is increasingly pulled into drought response too, through emergency pumping restrictions or conjunctive management of wells near streams.

For an owner or buyer, the operative question is: in the last ten years, how many times was this right curtailed, and for how long? State curtailment records are public. Ground whose right delivered through 2012–2016 and 2021–2022 in the West has proven reliability; ground curtailed in four of ten years should be priced — and cropped — accordingly. Check the specific stream system's call history with the watermaster or a water attorney.