General Discharge Permit For Discharges from Mineral Mines, Quarries, Borrow Pits, and Concrete and Asphalt Plants
Maryland General Permit No. 15-MM
NOTICE - Tentative Determination Draft Published
The Department proposes to reissue the State/NPDES (National Pollution Discharge Elimination system) 15-MM as the new 26-MM. The 26-MM permit applies to discharges of stormwater and certain wastewater discharges from Mineral Mines, Quarries, Borrow Pits, and Concrete and Asphalt Plants in the State of Maryland.
A hybrid public hearing will be held on November 30, 2026, beginning at 6:00 PM. The in-person hearing will be held in the Severn - Community Meeting Room, at the Severn Library - Anne Arundel County Public Library, 2624 Annapolis Rd, Severn, MD 21144.
The virtual event may be joined via Google Meet. To participate online, you MUST register using the following link: https://mdewwp.page.link/PublicMeetings.
If you would like to provide written comments, please submit them to the Maryland Department of the Environment, Water Management Administration, 1800 Washington Blvd., Ste. 455, Baltimore, MD 21230-1708, Attn: Paul Hlavinka, Industrial Stormwater Permits Division, or by email at [email protected]. Comments must be submitted on or before December 07, 2026, by 5:00 PM. Fax comments to (410) 537-3163, attention Paul Hlavinka.
The draft permit, fact sheet, and a detailed summary of proposed changes are available below.
NOTICE - New Online Service Center
The Department now has the online Environmental Service Center, which applicants can use to easily submit new NOIs, modification requests, notice of terminations, and pay permit fees.
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.
Existing Permit - General Discharge Permit No. 15-MM (NPDES No. MDG49)
The 15-MM general permit became effective on May 1, 2017 and expired on April 30, 2022.
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 15-MM. Proposed new discharges from mineral mines, quarries, borrow pits, and concrete and asphalt plants 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 from mineral mines, quarries, borrow pits, and concrete and asphalt plants if an applicant meets the 15-MM eligibility criteria and declares intention to operate in accordance with the terms of the Consent Order and 15-MM. 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 15-MM.
Note that existing registrations under the General Permit 15-MM 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.
15-MM Permit
Forms
Supplemental Information
10-MM Permit
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
