Per-capita water use has declined in 100 communities that depend on the Colorado River, the primary source of freshwater to much of the southwest. But as populations expand, overall water consumption is still climbing.
Water conservation efforts in the western US over the past 20 years appear to be paying off.
Major communities that rely partly or completely on the Colorado River for their water have reduced per-capita demand on the river an average of 1 percent or more each year between 1990 and 2008, according to a new study. In all, that's some 2 million acre-feet of water saved – enough to supply Los Angeles for about three years.
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