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.

READ MORE: Fire Burns At Pleasant Hill Senior Living Facility

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.

READ MORE: UPDATE: CHP Arrest 2nd Suspect in Scotts Valley Highway 17 Chase and Shootout

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.

MORE NEWS: UPDATE: San Francisco Easing Some Indoor COVID Masking Requirements On Feb. 1

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