Freshwater is essential for life on Earth, but analysts at the World Bank say more often than not, there's either too little, too much, or the water is contaminated and polluted.

We look at whether desalinating ocean water and piping it across the desert would really solve water scarcity, why some cities and towns keep flooding, and how much is too much, when it comes to pumping freshwater out of underground aquifers.

In Season 5 of What About Water, host Jay Famiglietti connects with scientists and regular people who are trying to solve some of our planet's trickiest water problems. Armed with the latest scientific expertise, he brings listeners a message of hope for this planet’s water future.

People in the lower Colorado River basin are now witnessing drastic cuts to their allotments. In many cases, developers find alternate sources of water by drilling into underground aquifers. But in places like Pinal County, Arizona, that groundwater is already becoming scarce. We hear from Stephen Q. Miller, who sits on both the Pinal County Board of Supervisors and the board for the Central Arizona Pipeline. Without sufficient water for crops, and facing some of the highest temperatures on record, he says farmers in his area will fallow up to 70 per cent of their land this year.

As Phoenix and its outlying suburbs start limiting development because of water shortages, those who stay put rely increasingly on wells and groundwater.

Arizona State University professor Kathryn Sorensen explains why consuming water from deeper wells is one solution – but it’s not ideal. The ancient freshwater underneath much of Arizona will never be replenished during our lifetimes. With high-tech cloud computing centers and some of the world’s biggest microchip manufacturers expanding their reach — and water use — we look at the desert future of the southwest.

With increasing water scarcity across the lower Colorado River basin states, we look at the technology of the future – and the role of cloud computing centers. How much water do they consume, and what does that mean for people in water-stressed areas? Amazon Web Services has set a goal to become water-positive by the year 2030, and we hear how the company is recycling and re-using water, with Will Hewes, AWS’ Global Lead on Water Sustainability.

Outside Phoenix, Intel Corporation has been a presence for more than four decades, with two recent expansions of its 700-acre campus in the desert. Those expansions allow Intel to manufacture more of the microchips that we rely on in modern life, powering everything from cell phones to automobiles. We hear from Intel vice-president and chief sustainability officer Todd Brady. He says the public-private partnership Intel struck years ago with the city of Chandler, AZ means a more sustainable, predictable supply of recycled water.

Water scarcity is also having a profound effect on the desert south’s political landscape. In this episode, we hear from Kathleen Ferris, a senior research fellow at ASU’s Kyl Center for Water Policy, and we check in with Patrick Adams, water policy advisor to Arizona Governor Katie Hobbs.

Our last word in this episode goes to the University of Arizona’s Kathy Jacobs, director of the Center for Climate Adaptation Science and Solutions.

The meat and dairy industries are some of the biggest water users in the American West, thanks to one of cows' favorite foods – alfalfa. As aridification continues across the American southwest, water is becoming far more scarce on the Colorado River. A critical source of water for roughly 40 million Americans, we look at why so much of the Colorado River's freshwater goes toward growing water-intensive hay crops, and at what can be done to significantly scale back consumptive use in the future.

In this episode, we hear from people who've traveled from around the world to see the Hoover Dam. With white bathtub rings marking a long-past high water mark, Lake Mead is severely overdrawn. Together with Lake Powell, America's two biggest man-made reservoirs are losing water faster than ever as cities, towns and farms withdraw their legal allocations.

To find out why farmers in this region keep growing such water-intensive crops, our producer Megan Myscofski meets up with alfalfa farmer Larry Cox. They tour his farmland near Brawley, in California's Imperial Valley. With no potable water, Cox's home, farm and livelihood depend entirely on his farmland's senior water rights from the Colorado River. Leaving the fields fallow is not an option.

Jay then sits down with Dan Putnam, an expert on alfalfa and other forage crops at the University of California, Davis, and Sarah Porter, director of Arizona State University's Kyl Center for Water Policy. They discuss why it's so difficult legally and economically to uproot water-intensive crops such as alfalfa, and they bring up solutions to get ‘more crop out of each drop’. They also discuss what cities and urban areas will have to do, to ensure there's enough water to support everyone in the lower Colorado River basin.