(Israel Hayom) The Israel Prison Service is reportedly exploring the possibility of limiting Palestinian security prisoners’ time in the shower, after learning that they are wasting water on purpose.

Israel is grappling with a five-year drought, and the public has been asked to use the precious resource wisely, but according to religious news website Hakol Hayehudi, security prisoners are wasting hundreds of thousands of cubic feet of water on purpose to undercut Israel’s water supply.

According to the report, IPS data shows that security prisoners’ wards use up far more water than the criminal wards, whose inmates spend less time in their cells. The discrepancy between the wards’ water use is so great that it led the IPS to believe that Palestinian inmates leave their showers running for hours on purpose, to waste water.

An analysis of the data shows that security prisoners use about 3.5 times more water a year than the average Israeli—250 cubic meters (8,830 cubic feet) compared to 70 cubic meters (2,472 cubic feet). As there are currently 5,800 Palestinian security prisoners in Israeli jails, they seem to waste an average of 750,000 cubic meters (26,486,000 cubic feet) of water a year, costing taxpayers some 5.6 million shekels ($1.5 million).