Social entrepreneurs have come up with a way to scale a solar solution that brings clean water to areas with little to no access to clean water. The solution is a solar-powered water plant that uses reverse osmosis and ultraviolet filtration technologies to convert dirty water into clean drinkable water. See here the 5-stage solution that these social entrepreneurs are putting in place to meet the water needs of rural villages in India.
These social entrepreneurs are using solar power to battle the global water crisis
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