Droughts are threatening California's water supply. The state is racing to save what's left.
Briefly

In 2012, San Francisco's Public Utilities Commission began developing the Onsite Water Reuse Program to investigate whether water reuse could be a solution to California's water problem. There weren't any state or national regulations, so a permitting program was created to streamline adoption of on-site water-reuse systems.
On-site water reuse is becoming a strong alternative to building large water-recycling plants, as the US faces a $625 billion cost to repair water infrastructure. Silicon Valley is investing in these systems to address future water supply challenges in California.
Read at Business Insider
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