The Maryland Department of the Environment (MDE) has issued an Advanced Notice of Proposed Rulemaking (ANPRM) to update stormwater regulations in COMAR 26.17.02 and the Maryland Stormwater Design Manual. For more information on the ANPRM, draft regulations and design manual updates, follow the links below:
- Advanced Notice of Proposed Rulemaking (ANPRM)
- Draft Regulations
- Draft Stormwater Design Manual
MDE invites written comments on this ANPRM through December 19, 2025. Please include your name/organization and, where possible, cite specific sections of the draft regulations or design manual your comments address. Attachments and supporting analyses are welcome. All comments received will inform the development of formal proposed regulations.
Comments may be submitted via email at mde.swmregulations@maryland.gov, or by mail:
Stormwater, Dam Safety, and Flood Management Program
Maryland Department of the Environment
1800 Washington Boulevard, Baltimore, MD 21230.