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Knee-high tufts of grass dot the streets of Hardwick, a rural neighborhood with a few dozen homes hemmed in by vineyards and walnut and almond orchards in California’s agriculture-rich San Joaquin Valley. Nearby, the Kings River — swollen with rainwater and Sierra Nevada snowmelt — meanders through fields. Water is abundant in the river but it may not last. Despite winter storms that have turned much of California’s parched landscape to vibrant green, the drought has yet to loosen its grip on thousands of residents in the valley. Many people must still use water stored in large tanks in their yard to wash dishes and bathe.

A new nationwide study has unearthed the huge hidden potential of tapping into salty aquifers as a way to relieve the growing pressure on freshwater supplies across the United States. Digging into data from the country’s 60 major aquifers, the U.S. Geological Survey reports that the amount of brackish — or slightly salty — groundwater is more than 35 times the amount of fresh groundwater used in the United States each year.

Dramatic improvements are needed in ensuring access to clean water and sanitation worldwide, the World Health Organization said Thursday, warning that nearly two billion people currently use faecal-contaminated water. Hundreds of thousands of people die each year because they are forced to drink contaminated water, the WHO said, urging large investments to help provide universal access to safe drinking water.

California Governor Jerry Brown officially declared the drought over last Friday, a dramatic conclusion to years of dry weather capped off by two winters of violent storms. Though drought damage will take years to undo, and another drought may even be around the corner, it was a remarkable turnaround. In fact, according to the National Oceanic and Atmospheric Administration, it was the proverbial one in a hundred shot. “The odds of the state completely recovering from its extreme dryness within two years are estimated at less than one percent,” paleoclimatologist Eugene R. Wahl, told NOAA.

Fresno City Council members voiced no objections Thursday to allowing residents to water their landscaping up to three days a week during the hot summer, and two days a week during the milder spring and fall months. A wet winter with ample rainfall is creating the relief for residents who want to keep their lawns green. The city’s stringent one-day-a-week winter watering schedule will come to an end on April 30.