Navigable Waters Protection Rule and USACE Charleston District Regional Conditions The final Navigable Waters Protection Rule (NWPR) was published in the Federal Register on 21 April 2020 and became effective on 22 June 2020. The NWPR revises the definition of waters of the United States (WOTUS) and as a result, the U.S. Army Corps of Engineers’ (USACE) and states’ jurisdictions over surface waters. At the time of the NWPR’s implementation, southeastern states, with the excep