Irrigation · May 2025 · 5 min read
In the western United States, water is allocated through a system fundamentally different from eastern riparian rights. Understanding prior appropriation is essential for any farm operation that depends on irrigation.
Western water law follows the principle of "first in time, first in right." Senior water rights holders receive their full allocation before junior rights holders receive any water. Your priority date—typically the date you first applied water to beneficial use or filed your application—determines your standing. During drought years, junior rights may be curtailed entirely while senior rights remain intact.
Most states require a water right permit specifying the point of diversion, place of use, purpose, and maximum volume. Failing to use your water right for a statutory period—often five years—can result in forfeiture or abandonment. Keep detailed irrigation records including dates, volumes pumped, and acres irrigated to demonstrate continued beneficial use during periodic reviews.
Many western states now offer incentives for water conservation without penalizing growers through the "use it or lose it" provision. Upgrading from flood to sprinkler or drip can reduce diversions by 30–50%, and some states allow you to lease saved water. Contact your state engineer's office or local water district to understand current conservation programs and transfer options.
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