"Las Vegas sucks up a lot of water. In 2010, the latest year for which nationally comparable figures have been released by the US Geological Survey, each resident of Clark County, which covers the entire urban area of Las Vegas and its suburbs, used 234 gallons of water every day. In California, the figure was 181 gallons. But in recent years southern Nevada has dramatically cut its water use. Between 2002 and 2014 the region’s consumption of Colorado river water fell by 30%, even as Clark County added half a million residents."

This seems to confuse things, implying that Vegas is becoming more thrifty when measured from 2002 to present but the snapshot from 2010 shows strikingly high utilization. Where did they start, 300 gallons per day per person?