A solar-powered water filter removes contaminants smaller than viruses without clogging or needing pumps, exploiting ...

Environmental and tribal groups say California's Bay-Delta plan hands too much power to water agencies and shortchanges salmon-saving flow rules.

Existing technology is being upcycled and deployed in new ways as companies seek to measure more data, more accurately.

Every year at Grand Canyon National Park, millions of visitors from all over the world stop at one of a dozen water spigots.