Manteca residents slashed their water use 42 percent in March over 2013 consumption levels.The March results came on the heels of a revised state mandate for Manteca water consumption as part of the ongoing state drought emergency.Manteca is now being required to reduce water use by 27 percent over 2013 levels compared to the 32 percent target that they had to meet up until last month.“It’s going to be tight but it is doable,” Public Works Director Mark Houghton said of the new state mandate.Manteca used 206 million gallons of water in March. That is the second lowest March since 2003. The last lowest March was 2010 when 203 million gallons were used.The state eased but did not drop drought targets.