Conservation scientists have determined that Trump’s plan to rescind the 2001 “roadless rule” could jeopardize clean water supplies in key states across the American West.

A new study calculates the risk to clean water if the Trump Administration repeals the Roadless Rule.

Nearly all drinking water in the United States starts somewhere in a forest, long before it reaches a tap. About 90% of Americans get their water from public systems, and a large…