“It will be used as drinking water and is enough to supply 816,000 people with enough water for an entire year”
If they only drink the water, perhaps 816,000, but if you go by average household usage, closer to 10,000 homes. So better than nothing...
Pretty sure they are referring to tap-water when they say drinking water.
On the other hand 816,000 is only about ten percent of the population. Maybe less.
Or the pools in Beverly Hills and Malibu.