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
As a Chesapeake Bay Program (CBP) Best Mangement Practice (BMP), MDE is including oyster aquaculture in its Water Quality Trading Program. MDE has used the CBP expert Panel Report to help guide the credit generation and reporting process.
As there is no specific pollutant goals for this practice, the baseline for generating credits is existing conditions.
There are two ways to generate credits using this practice:
- Basic Credit: The basic credit requires that oysters harvested and sold should be an oyster class size minimum of 2". To determine the credits that were generate please see the example below.
- Enhanced Credit: This credit requires counting oysters by size and ploidy at several intervals to determine the quantities of oysters at various class sizes.
The CBP's report also recommended certain criteria for reporting in setion 9.2 on page 67. MDE has adopted many of the criteria and is in the process of coming up with a form to collect that information.
All credits require a 3rd party verifier that will be legally responsible for the credits they verify. MDE is working with industry professionals and growers to come up with a process to approve verifiers in a way that will provide transparency and ensure that credits are being generated accurately.
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