After the city of Los Angeles announced that it would increase its minimum wage to $15 an hour, many nearby cities began to consider the idea as well. Despite this, many cities may decide to avoid holding a vote over the wage increase in favor of waiting for a statewide policy that would increase the minimum wage. Officials of cities in California hope that a statewide vote would take the pressure off of individual cities to raise local wages.
See "Cities want to raise the minimum wage. But it's complicated.", Abby Sewell, The Washington Post, February 8, 2016