Maryland’s NPDES Municipal Separate Storm Sewer System (MS4) Phase II General Permits

MDE has developed a database structure for Phase II Municipal Separate Storm Sewer System (MS4) permittees to use for reporting stormwater best management practice (BMP) data. All permittees should begin to use this format to prepare for new permit requirements. Permittees may use the following link to MDE's BMP Locator to identify geographic coordinates of BMPs:  
Guidance for the database, an excel template, and fact sheet on impervious area restoration are posted here:

If there are any questions concerning the NPDES Phase II MS4 database, please contact Ms. Deborah Cappuccitti at 410-537-3543 or at