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Water entering the dams has also fallen by 19 percent, the report adds.
A rise in water consumption and a decline in precipitation has reduced water reserves in the Iranian capital to their lowest levels in the past four decades.
The head of the Tehran Province water and sewage company reports a 2.4-percent increase in water consumption in the past two months, adding that the company is looking at acquiring licences to shut down water to heavy consumers.
Many environmental activists have warned that drinking water in the capital will soon reach the same critical situation as air pollution, spiraling out of control.
By Radio Zamaneh
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