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General Discharge Permit

General Permit for Discharges from Tanks, Pipes, and Other Containment Structures at Facilities other than Oil Terminals
Maryland General Permit No. 11-HT

 Important Announcement - Invitation for Additional Comments on General Discharge Permit 17-HT (July 19, 2019 - August 19, 2019) 

On August 3, 2018, the Department published notice of its tentative determination for the update and renewal of General Permit for Discharges from Tanks, Pipes, Other Liquid Containment Structures, Dewatering Activities, and Groundwater Remediation (Maryland General Permit No. 17-HT).  The comment period, which satisfied the tentative permit requirements for public participation, closed on September 13, 2018.  

The Department is currently preparing a final determination and is now informally seeking comments limited to specific items which may change from the tentative determination.  Please refer to the full public notice (below) for a list of the nine changes for which comments will be accepted.  Persons who wish to provide comments concerning the potential changes may submit a written statement​ to the Department no later than 5:00 p.m. on Monday, August 19, 2019.  

Copies of full public notice regarding the invitation to comment, an updated draft permit (including potential updates from the tentative determination), a draft of the response to comments document (for comments submited following the tentative determination), and drafts of ancillary documents which support new standards for chemical additives, which are available for view by clocking the links below.  For reference, the Department has also included the tentative determination version and a copy of the draft fact sheet. ​

 Any comments regarding this permit should be directed to Michael Richardson using the following contact information: 

  • ​Mail:     Maryland Department of the Environment                                                                                                 Water and Science Administration                                                                                                             1800 Washington Blvd., Suite 455                                                                                                             Baltimore, MD 21230-1708  
  • Email:  
  • Phone:  (410) 537-3323 (between 8 a.m. and 5 p.m., Monday through Friday)

Until the new 17-HT permit is final and issued, the 11-HT permit is administratively extended beyond its expiration date of February 28, 2017. The terms and eligibility requirements under that permit continue in full force and effect until a final determination is issued on the 17-HT permit. Those registered under the 11-HT permit DO NOT have to submit for renewal at this time, but should continue following the terms of your 11-HT registration. Current permit registrants will continue to receive notification letters regarding progress of the renewal, including notification of a deadline to renew. This webpage will also be updated regularly to reflect current status.


11-HT Permit Information (Existing Permit)

The 11-HT general permit became effective on March 1, 2012.


  • General Permit No. 11-HT for Discharges from tanks, pipes and other containment structures at facilities other than oil terminals


Supplemental Information

Contact Info

If you have additional questions or would like more information, please contact the Wastewater Permits Program, Industrial & General Discharge Permits Division at 410-537-3323.


Additional Information and Related Links