(Bloomberg) -- California regulators approved rules that for thefirst time require mandatory water reductions across the state as ahistoric drought gripping the region enters its fourth year andconservation efforts fall short of targets.

The state’s 411 urban water suppliers must cut use by 8% to 36%,with some of the deepest decreases imposed on wealthy communitiesthat haven’t reduced their consumption enough. Those cities thathave already cut back the most would face smaller restrictions.

The drought has forced farmers in the nation’s top agriculturalstate to fallow millions of acres while some rural communities arerunning out of water. The cost to drill wells has tripled becauseof demand and the below-ground aquifer in some parts of the statehas sunk to the lowest level ever. The price of water is on therise as utilities increase rates to make up for lost revenue.

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