Regulatory Correspondence

Please submit any correspondence, including compliance certification forms, via email at

or via mail:

U.S. Army Corps of Engineers, Baltimore District
Regulatory Branch (CENAB-OPR)
2 Hopkins Plaza
Baltimore, MD 21201

Regulatory Overview

The mission of the U.S. Army Corps of Engineers Regulatory Program is to protect the Nation's aquatic resources while allowing reasonable development through fair, flexible and balanced permit decisions. The Corps has been regulating activities in the nation's waters since 1890. The program was initially created solely to prevent obstructions to navigation. An early 20th century law gave the Corps regulatory authority over the dumping of trash and sewage. The passage of the Clean Water Act in 1972 greatly broadened this role by giving the Corps authority over dredging and filling in the waters of the United States including many wetlands.

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Regulatory Latest News

September 25, 2023-Special Public Notice for Tropical Storm/Cyclone 16/Ophelia Storm Damage Repair
The purpose of this notice is to inform the public that repairs of damage to public and private property caused by Tropical Cyclone 16/Tropical Storm Ophelia and associated flooding and weather conditions, may be authorized, subject to the procedures described below in Maryland, the District of Columbia, certain military installations in Northern Virginia, and Pennsylvania.

September 20, 2023-The Maryland Stream Mitigation Framework Version 1 Final (MSMF V.1. Final)
The Corps has published the Maryland Stream Mitigation Framework Version 1 Final (MSMF V.1. Final) for use by Corps project managers in review of Department of the Army permit applications where greater than minimal stream impacts occur and for review of mitigation proposals in Maryland to offset such impacts. The tool includes a user manual, stream credit/debit calculation workbook, and several other appendices to help populate fields in the calculation workbook including Functional/Conditional Assessments for streams and stream buffers. MSMF V.1. Final may also be used by project applicants to estimate stream credits or debits for proposed permit applications.

April 12, 2023-Joint Public Notice - Notice of Availability of the Beta Streamflow Duration Assessment Method for Northeast/Southeast:  
The method, data forms, and training opportunities are available at: For additional information on the development of regional Streamflow Duration Assessment Methods for nationwide coverage, see:

March 20, 2023-2023 Rule (Revised Definition of “waters of the United States”)
On January 18, 2023, the U.S. Environmental Protection Agency and the U.S. Department of the Army published a regulation in the "Federal Register" revising the definition of waters of the United States now known as the 2023 Rule. This rule became effective on March 20, 2023. More information on the 2023 Rule can be found here.

January 20, 2023-2022 NWPL
The U.S. Army Corps of Engineers (USACE), as part of an interagency effort with the U.S. Environmental Protection Agency, the U.S. Fish and Wildlife Service and the U.S. Department of Agriculture Natural Resources Conservation Service, is announcing the availability of the draft changes to the 2022 NWPL and its web address to solicit public comments.  The public now has the opportunity to comment on the proposed changes to wetland indicator status ratings for two plant species in the Arid West region.  The Federal Register Notice (FRN) for the 2022 NWPL update can be found here: 2023-01026.   The public comment period ends on 21 March 2023.

The two species and their draft 2022 wetland ratings by region, as well as the FRN, can also be viewed at the NWPL homepage,, under “2022 NWPL Update Information.”  A link to provide general or species-specific comments is also available at this location. Users are encouraged to submit literature citations, herbaria records, experiential references, monitoring data, and other relevant information.  Specific knowledge of, or studies related to, individual species are particularly helpful.  Commenters should use their regional botanical and ecological expertise, field observations, reviews of the most recent indicator status information, appropriate botanical literature, floras, herbarium specimens with notation of habitat and associated species, habit data, relevant studies, and historic list information.  Providing ratings without supporting documentation or information is not recommended.  All submitted comments and information will be compiled and sent to the National Panel for their consideration.

USACE is also seeking comments regarding the NWPL update process and a proposed change to update the NWPL every three years, rather than the present every two years.  Detailed information on the update process, protocol, and technical issues can be found in the following documents (available on the “NWPL Publications” web page referenced above):

  1. Lichvar, Robert W. and Minkin, Paul. Concepts and Procedures for Updating the National Wetland Plant List. Sept 2008. ERDC/CRREL TN-08-3
  2. Lichvar, Robert W. and Gillrich, Jennifer J. Final Protocol for Assigning Wetland Indicator Status Ratings during National Wetland Plant List Update. Sept 2011. ERDC/CRREL TN-11-1

USACE administers the NWPL for the United States and its territories.  The NWPL provides plant species indicator status ratings, which are used in determining whether the hydrophytic vegetation factor is met when conducting wetland delineations under the Clean Water Act and wetland determinations under the Wetland Conservation Provisions of the Food Security Act. Other applications of the NWPL include wetland restoration, establishment, and enhancement projects.  Additions or deletions to the NWPL represent new records, range extensions, nomenclatural and taxonomic changes, and newly proposed species.  The latest review process began in 2022 and included review by Regional Panels and the National Panel. 

December 1, 2022-Interim Draft OHWM Manual
USACE and EPA announced the availability of the Interim Draft of the National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams (National OHWM Manual) and its accompanying data sheet. A direct link to the announcement with a link to the public notice is available at: