Seven public water systems supply parts of Bakersfield, not two. California Water Service's Bakersfield district is the biggest, at roughly 268,000 people; the City of Bakersfield's own Domestic Water System serves about 160,000; and Vaughn Water (Rosedale), East Niles Community Services District, Oildale Mutual, Cal Water's North Garden district and Greenfield County Water District cover the rest. Around forty small mutual water companies serve the fringes.
A quirk worth knowing: if you are a City of Bakersfield customer, Cal Water crews maintain your pipes under contract. You pay the City, but Cal Water runs the system.
It matters because the watering rules are not the same from one supplier to the next. Cal Water is in Stage 1 — no restricted days, but no watering between 8 a.m. and 6 p.m., any day. Oildale Mutual and Vaughn both publish odd/even day schedules. The City's day schedule is the one we could not confirm from an official source: the municipal code sets no days, and two different versions circulate in local reporting, so ring (661) 326-3715 before you rely on one.
To find yours, this town has a "Who Supplies My Water?" tool — type your address and it reads the state's official service-area map. Your bill is the final word either way.