It's no surprise that the Waters of the United States, WOTUS, are in danger under the Trump administration. Here's an article that highlights the concern on this topic:
The Waters of the United States (WOTUS) Rule: What It Is and Why It's Important
President Trump has ordered the EPA to begin reviewing the rule that
governs how the agency protects waterways. Here's what WOTUS means to
wildlife and people alike.
"Keep navigable waters clean." It sounds straightforward, but in
practice it's anything but. For decades, the Environmental Protection
Agency has struggled with that task, after the Clean Water Act in 1972
gave them the authority to regulate "navigable waters." But "navigable"
doesn't cover small streams and wetlands, and water in those areas has a habit of flowing downhill into other, larger bodies of water. Whether the EPA could regulate all that water before it reached someplace navigable was never clear.
Read full article here: http://www.audubon.org/news/the-waters-united-states-wotus-rule-what-it-and-why-its-important