Despite a stay ordered by a federal appeals court, the Environmental Protection Agency (EPA) and the U.S. Army Corps of Engineers have continued to enforce the controversial Waters of the United States (WOTUS) rule, according to a report issued last week by a U.S. Senate committee.

The report, released by Okla­homa Sen. James Inhofe, chairman of the Senate Environment and Public Works Committee, showed that the EPA and Corps have taken a...