It has been estimated that more than 60 percent of California’s freshwater comes from mountain storm runoff and snowmelt. Yet these mountain watersheds have never been officially recognized for their role in delivering and filtering this enormous share of the state’s vital water supply.

That may change soon. A bill in the state Legislature, AB 2480 (authored by Richard Bloom, D-Santa Monica), would officially recognize five critical Sierra Nevada and Cascade watersheds as important pieces of the state’s water infrastructure.