In order to generate credits from non-point urban Stormwater and Alternative BMPs, credit generators must meet the baselines for credit generation highlighted in this section.
The baseline requirement to generate WQ credits for a permitted municipal source is the restoration requirement of the National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permit. For these permits, this is expressed as a percent impervious area treated.
The baseline requirement to generate WQ credits for a stormwater nonpoint source is existing conditions.
Once baselines are met, any additional approved BMP installed is eligible for credit. All practices implemented in this sector to generate water quality credits shall use assessment tools consistent with the CBP modeling tools and be accepted by MDE to calculate tradable credits.
If you are interested in certifying credits for either Permitted or Non-permitted stormwater please send the following documents to MDE Trading program Administrator via the email address provided at the bottom of this web page.
In order to generate credits from Wastewater Sector BMPs, credit generators must meet the baselines for credit generation highlighted in this section.
The baseline for a wastewater point source shall be determined by MDE based on a concentration or loading benchmark established in the wastewater point source’s discharge permit. All facilities that wish to participate in trading must obtain permits that include terms allowing them to do so.
Performance credits generated by Wastewater Treatment Plant (WWTP) point sources shall be based on the individual plant’s performance as follows:
For wastewater point sources credit certification, please send the following documents to the MDE Trading Administrator. For a list of eligible practices see Tools and Resources.
In order to generate credits from On-Site Disposal Systems (OSDS), credit generators must meet the baselines for credit generation highlighted in this section.
Current baseline loads for nitrogen credit generation is 18.56 lbs/year for systems located in the Critical Area for the Chesapeake and Atlantic Coastal Bays, 11.60 lbs/year for a system located within 1,000 feet of surface water, and 6.96 lbs/year for all other systems.
Nitrogen credit for an OSDS upgraded with nutrient removal technology is calculated by subtracting the load of an upgraded system from that system’s previous baseline load highlighted above.
If you are interested in certifying credits for OSDS please send the following documents to the MDE Trading Administrator via the email address provided at the bottom of this web page.
Photo Credits: Maryland Sea Grant/Michael Flynn
MDE is working to develop a process for certifying Oyster Tissue Credits from Aquaculture. PLease contact the MDE Trading Administrator to find out the current status.
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