Three Coachella Valley water agencies are among the state’s top five residential water users this winter so far, according to state data released last week amid growing concerns about serious drought.  Tiny Myoma Dunes Water District — which serves Bermuda Dunes and a corner of La Quinta — ranked first in January, producing 217 gallons a day per residential customer. … Statewide, the average amount of water produced per customer was 66 gallons per day in January, but many areas in the Coachella Valley are at nearly three times that amount.