A drop-off in Californians’ water conservation efforts seems to have leveled off, state officials said Tuesday, though residents still used more water during the month of September than they did the same month in 2015. The news comes one month after the State Water Resources Control Board expressed concern that savings were slipping. Earlier, the board had decided to relax the rules and allow cities to set their own numeric targets; most decided that none were needed. So when conservation starting slumping, critics said the board wasn’t taking aggressive enough action.