Californians saved about 30 percent less water in September than they did a year earlier, and state water officials said Tuesday they might revive mandated cuts. Overall, communities statewide conserved 18.3 percent this September compared with the same time three years ago, according to data released Tuesday. But compared with the same time last year — when Californians saved 26.2 percent in water consumption — water use increased by nearly 8 percent. The state changed its water conservation program in May, switching from mandatory cuts to voluntary cuts. Officials said they would consider another change if drought conditions persist and water consumption continues to grow.