Experts say it could be just weeks until the Iranian capital runs out of water. CNN Chief Climate Correspondent Bill Weir speaks to Becky Anderson.

Tehran

Tehran, home to 10 million people, is experiencing a severe water crisis that experts warn could soon lead to 'day zero'—the point at which the city runs out of water. The crisis is attributed to a combination of one of the worst droughts on record, poor water management, and the high water demands of agriculture, which consumes 90% of the country's water resources.

Authorities have responded by deploying water tankers, reducing water pressure, and encouraging residents to leave the city to reduce demand. Long-term solutions like large-scale water transfers or desalination are costly and time-consuming, leaving the city vulnerable in the immediate future. Experts warn that unless aquifers are recharged holistically, Tehran could face 'water bankruptcy,' a situation increasingly seen in other major cities worldwide.

Tehran’s 10 million residents face a dire water crisis

10 million people who live in Tehran are facing a potentially dire water crisis. Experts say it could be just a few weeks before what they are calling day zero when the Iranian capital runs out of water. Now, the country is experiencing one of its worst droughts on record, but that's not the only reason that water is scarce. There is a host of other factors that have played a part, including poor water management and the demands of a large farming industry. I want to get you more on this. CNN chief climate correspondent Bill Weir joining me now. And Bill, let's just do a bit of a deep dive on this and get a sense from you as to what has led to this very specifically. Well, Becky, it's really a confluence of events. It goes back really to the revolution when agricultural workers seized some of the land they had been working on, which set up generations of legal conflict, which means there wasn't a lot of investment into infrastructure around agriculture. Ninety percent of the water use in Iran, even though a lot of small farms there, goes to agriculture to grow thirsty crops like wheat and pistachios, those sorts of things. And meanwhile, in order to support the growing population, booming cities like Tehran, they had to pump groundwater to the point where some parts of that city are sinking centimeters a year as a result of all that water being pumped without replacement there. So it is a confluence of mismanagement, climate change, of course. They have a drought now for five years, record high temperatures near 50 degrees Celsius, all leading up to this real crisis. How are authorities coping? What are they doing? Well, there's there's immediate sort of mitigation, which includes water tankers rolling into neighborhoods. They cut the water pressure by almost half in Tehran, which means if you live on a high floor and a high rise, you might not have any water at all. This, of course, will separate the haves from the have nots. Those who can afford storage for their water to ride out these. They've had a national holiday one day to hoping that it will decrease water demand. They're considering maybe a week off for the country, encouraging people to leave the city and decrease both water and electricity demands. And they're praying for rain. But in terms of water transfers, big water transfers like they did in South Africa in the past or desalination projects like Israel relies on in the Middle East. Those are expensive. They take time. And one expert our team talked to used the term water bankruptcy. At a certain point, you get past getting back to normal if you can't recharge these aquifers in a holistic way. And again, this isn't just Iran. This is happening. India happens in Mexico City. The American West is dealing with these stresses as well. A real wake up call for everyone.

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