More than 30 percent of the nation is experiencing at least a moderate drought, making this one of the most severe water shortages in American history.

Conditions in seven states are so severe that each has more than half of its land area in severe drought, according to data from the U.S. Drought Monitor.

In an interview with 24/7 Wall Street, U.S. Department of Agriculture meteorologist Brad Rippey said the drought has been a long-running issue. “This drought has dragged on for three and a half years in some areas, particularly in North Texas,” he said.

States are ranked by land area affected by severe, extreme and exceptional drought. Severe drought is characterized by crop loss, frequent water shortages and mandatory water-use restrictions. Extreme drought causes major crop/pasture loss with widespread water shortages and restrictions. Exceptional drought creates water emergencies. As of last week, the seven states experiencing the most severe droughts were:

7) Texas
Percent severe drought: 56.1
Percent extreme drought: 39.9
Percent exceptional drought: 20.7

6) Oklahoma
Percent severe drought: 64.5
Percent extreme drought: 50.1
Percent exceptional drought: 30.4

5) Arizona
Percent severe drought: 76.3
Percent extreme drought: 7.7
Percent exceptional drought: 0.0

4) Kansas
Percent severe drought: 80.8
Percent extreme drought: 48.1
Percent exceptional drought: 2.8

3) New Mexico
Percent severe drought: 86.2
Percent extreme drought: 33.3
Percent exceptional drought: 4.5

2) Nevada
Percent severe drought: 87.0
Percent extreme drought: 38.7
Percent exceptional drought: 8.2

1) California
Percent severe drought: 100.0
Percent extreme drought: 76.7
Percent exceptional drought: 24.8

In California, several water districts have been forced to pump ground water to serve communities, according to NBC Bay Area. In February, President Obama released more than $160 million in federal aid for the state, according to the Huffington Post.

According to the University of California’s Davis Center for Watershed Sciences, the economic impact of California’s drought on the agricultural sector this year alone has been approximately $1.7 billion, along with “substantial long-term costs” of groundwater overdraft that has gone unaccounted for.

“Reservoirs which are generally fed by the Sierra Nevadas and the southern Cascades [are] where we see the real problems,” Rippey told 24/7 Wall Street. “At [the current] usage rate, California has less than two years of water remaining.”

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