Effective March 20, 2023, the portion of waters of the United States (WOTUS) subject to federal regulatory control under the Clean Water Act (CWA) will be increasing.  This is the latest iteration of the rule, which the Environmental Protection Agency and Corps of Engineers describe as “a clear and reasonable definition of waters of the United States” designed to “reduce the uncertainty from constantly changing regulatory definitions that has harmed communities and our nation’s waters.”

As before, wetlands adjacent to traditional navigable waters, territorial seas, or interstate waters are under jurisdiction of the CWA.  The new rule will include tributaries that flow into these waters, as well as nearby wetlands, depending on their permanence and interconnectedness.  If the waters are “relatively permanent” or can “significantly affect WOTUS”, private and public parties performing work in or near these new waters may be subjected to regulations and permitting under the CWA.  These waters can include, naturally occurring ditches, prairie potholes, ephemeral drainages, and low spots on farmlands, and can be considered “relatively permanent” if continuous flow exists at any time during a year.  Significant potential effects include nutrients, sediment, temperature, and pollutants.

Additional information on this rule can be found here: https://www.epa.gov/wotus/revising-definition-waters-united-states