for six million people. you can t wait until the middle of the summer because it will be too late. i don t want anybody to turn on their faucet and not have water. reporter: the metropolitan water district of southern california is asking residents to cut their water usage by 35% while also mandating that either water limits are put in place or outdoor watering be restricted to one day a week in parts of los angeles, ventura, and san bernardino county beginning june 1st. the impacted communities don t get their water from the colorado river basin but instead the state water project which pipes water down from the northern sierra-nevada mountains and the sacramento/san joaquin delta. there s no supply. reporter: indeed, there isn t. there s not very much snow here. reporter: marking the end of the wet season, california measured only 4% of the april average for its snow pack. basically a frozen reservoir that accumulates snow over the