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​​General Permit for Stormwater Associated with Construction Activity

General Permit For Discharges of Stormwater Associated With Construction Activity
Maryland General Permit No. 20-CP 


 ​NOTICE - Permit Issued (effective April 1, 2023) ​​​

The Department has issued the final renewal permit for the General Permit for Discharges ​from Stormwater Associated with Construction Activity, effective April 1, 2023.  Existing permittees (registered under the previous 14-GP permit) must submit a Notice of Intent no later than September 30, 2023 to prevent a lapse in coverage.  On May 2, 2023, the Department corrected typographical errors in the 20-CP permit.  All corrections are reflected in the permit docu​ments linked later on this webpage. 

Permit Training

The Department offers free training opportunities for several of its general permits.  Visit the WPPRP Training ​Website to sign up for an upcoming training event or to download information from past training events.    ​

20-CP Permit Information​



  • ePermits
    • The Notice of Intent (NOI) for this General Permit is submitted electronically through the ePermits website, as are Notices of Termination and Transfers.
    • The NOI (for the 20-CP) must be electronically signed by the person in authority from the developer or builder; however, the system will allow agents and consultants to prepare any part of the NOI necessary, then send it to the person who will submit it as the responsible party.
    • Federal regulations require that applicants must submit certain information to MDE to validate their authorization to submit an NOI on behalf of a responsible party.  To meet this requirement, MDE developed a Subscriber Agreement Template Form (.docpdf).
    • Technical issues with the system should be submitted to the technical support team via the 24/7 Support link at the top of the system screen.
    • Public Notification Period - When NOIs (with all supporting documents) are submitted to MDE, a 14 day Public Notification P​​eriod​ is initiated and information is published on MDE's ePermits website to Public Notice.  Interested parties may review NOIs during the public notification period.  Please contact the appropriate Erosion and Sediment Control (E&SC) authority to review plans.  Interested parties may submit concerns about the E&SC to the approval authority and to MDE.  Concerns should be supported by a detailed, w​ritten explanation as to why the E&SC Plan fails to meet State​ standards.
  • Construction Activity Inspection Form  (.d​ocp​df)
  • Emergency Authoriza​tion Request Form​
  • Request for Cationic Chemical Additives Form

​Guidance Documents​

Supplemental Information​

Contact Info

If you have additional questions or would like more information, please contact the Industrial Stormwater Permits Division at (410) 537-3019.

Previous Permit (14-GP)

Additional Information and Related Links


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