Fracking is a thirsty technique — and most of the fracking underway in the U.S. is occurring in regions suffering from drought.

That’s according to a new analysis by Ceres, which reveals that frackers used 97 billion gallons of water to stimulate nearly 40,000 wells from January 2011 to March 2013.

Here’s a chart from the new report, showing that Anadarko Petroleum is the worst offender when it comes to tapping parched regions for water used in fracking operations:

via Frackers are guzzling water in drought-plagued areas | Grist.