The Trump administration is changing the definition of what qualifies as “waters of the United States,” tossing out an Obama-era regulation that had enhanced protections for wetlands and smaller waterways.

Thursday’s rollback is the first step in a process that will allow the Trump administration to create its own definition of which waters deserve federal protection. A new rule is expected to be finalized this winter.

https://www.npr.org/2019/09/12/760203456/epa-makes-rollback-of-clean-water-rules-official-repealing-2015-protections