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General Discharge Permit

​General Permit For Discharges of Stormwater Associated With Industrial Activity

 ​NOTICE - Draft Permit Renewal Announcement ​​​

The Department has proposed a Tentative Determination and published notice of a Public Hearing for the 20-SW General Permit for Discharges ​of Stormwater Associated with Industrial Activity.  Information regarding the tentative determination is presented below:

20-SW Tentative Determination Draft Documents

Important Dates

  • April 19, 2021 - The deadline for submitting written comments concerning the tentative determination concluded on this date.  
  • March 3, 2021 - The Department held a public hearing concerning the tentative determination on this date.  Attendees were offered the opportunity to submit verbal comments for the record during the public hearing.

Current Permit Information and Guidance Documents (12-SW) 

Change in Required Documentation

In recognition that the permit is beyond its five-year term, and in recognition that NPDES permits have a maximum duration of five years, the Department is discontinuing the acceptance of new registrations under permit 12-SW-A.  Proposed new discharges of stormwater associated with industrial activity submitted will not be allowed to obtain general permit coverage until a new permit is issued.

In place of permit coverage under the expired permit, the Department has issued an Order to cover proposed new discharges of stormwater associated with industrial activity if an applicant meets the 12-SW-A eligibility criteria and declares intention to operate in accordance with the terms of the Consent Order and 12-SW-A.  The applicant should submit a Declaration of Intent and complete the registration/certification process in accordance with the requirements otherwise set forth for registrations under permit 12-SW-A.
Note that existing registrations under the General Permit 12-SW-A continue to be covered under the existing administratively extended permit (per the terms of the permit).  Please check back here for updates as progress is made towards that end or sign up for our newsletter​.  Once a draft of the new permit has been proposed to open the public participation process, the Department will take comments prior to arriving at a final permit. ​



Guidance Documents

Supplemental Information

Contact Info

For more information on this permit, contact the Industrial and General Permits Division at (410) 537-3323.

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