SAN FRANCISCO (CBS SF) — Starting Monday, Californians must cut back on their water usage.

It’s part of the new state rules to deal with the drought.

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The reductions vary by water district.

For example, in the North Bay, Marin Municipal Water District customers need to cut back by 20%. In Livermore, it’s 24%, but in South San Francisco the mandatory reduction is only 8%.

The East Bay Municipal Utility District and Alameda County Water District both face a 16% reduction.

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MORE: Complete List Of Mandatory Reductions By Water District

California rate payers who don’t reduce their water usage could face hefty fines.

Residents who don’t know how much to reduce water consumption should contact their local water district.

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The new rules were put in place after Governor Jerry Brown’s executive order requiring a 25% cutback in water use across the state.