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Guide MassDEP Source Registration & Greenhouse Gas Reporting

Facilities which meet established regulatory criteria, exceed specific operating parameters or fall within certain categories are required to file. MassDEP may also direct others to report even if they might not otherwise be required to do so.

Table of Contents

News & Updates

2020 SR-GHG/SR/GHG forms are now available -- 2020 is now the default in the pre-form drop menu.

An updated list of filers is now available with deadlines. See Who Needs to File & When below.

Filing deadlines for 2021 (2020 data) are the deadlines in the current regulations (310 CMR 7.12 and 7.71).

Note that where a facility is due to file a combined SR and GHG report for 2020, the combined report is due on the later of the due dates for SR and GHG reports provided in the regulations (310 CMR 7.12 and 7.71).  Examples: (1) for a 3-year SR filer also required to file a GHG emissions report for 2020, the combined report is due on April 15, 2021; (2) for an Appendix C (Operating Permit) facility required to file both SR and GHG emission reports, the combined report is due on May 1, 2021.

If you need to file a correction for a previous year, please contact us first.  Corrections need to be filed before starting a new report.  Corrections also require filing a full report for all units for the year being corrected to ensure total values are correct.



Experiencing Delays or Difficulties with Printing?

Please see: Printing Guidance: Source Registration/Greenhouse Gas Reporting

Who Needs to File & When

Source Registration is due annually or every three years, depending on the facility. Greenhouse Gas Emissions Reports are due annually.

Which report(s) a given facility needs to file is determined by established regulatory criteria, operating parameters, or operational categories.

Source Registration

Facilities required to file are those that:

  • Have potential emissions or heat input capacities above thresholds specified at 310 CMR 7.00: Air Pollution Control (see 310 CMR 7.12: U Source Registration),
  • Fall within certain categories (e.g. most incinerators), or
  • MassDEP directs to file even if they do not meet regulatory criteria.
Greenhouse Gas Emissions Reporting

Facilities required to report are those that:

  • Are regulated under Title V of the federal Clean Air Act and Appendix C of 310 CMR 7.00: Air Pollution Control, or
  • Emit more than 5,000 tons per year of Carbon Dioxide Equivalent (CO2e).

In some cases, facilities are required to submit both SR and GHG reports.

A list of SR and GHG filers is posted below.

Additional Resources for Who Needs to File & When

References You Will Need

Once you login to the eDEP Online Filing system, you will need to enter or confirm information about your facility, its operations and emissions, including the following specific references. Links to all of these references are available in Additional Resources below.

  • Source Classification Code (SCC): Categorizes air pollution sources and associated emission factors, if available.
  • North American Industry Classification System (NAICS) Code: Categorizes business activity.
  • Emission Factors: eDEP uses these to automatically calculate combustion unit emissions based on the SCC you enter, or you may perform your own calculations.
  • Greenhouse Gas Emission Factors: Source- and fuel-specific inputs for calculating GHG emissions.
  • EPA Unit Type Code: Identifies the emissions unit activity.
  • EPA Material Type Code: Identifies the material or fuel processed. For fuel burning devices, this code is based on the SCC you enter.
  • EPA Air Pollution Control Device Code: Identifies the control equipment used to achieve emissions reductions.

If your facility has never filed a Source Registration before, it may first need to be added to the MassDEP database. Please email with the facility's name, physical and mailing addresses, federal taxpayer identification number, and contact information. MassDEP will reply with eDEP Online Filing system instructions.

Additional Resources for References You Will Need

How to File

Use the eDEP Online Filing system to submit your Source Registration (SR) annual or triennial report and/or Greenhouse Gas Emissions (GHG) annual report. Please note that if you are a new eDEP user, you will need to create an account first.

See Additional Resources below for:

  • A Quick Start guide, which is essential reading if you are a new SR and/or GHG filer, and provides time-saving steps for all users.
  • Field-by-Field Instructions on how to complete and file your SR-Only, GHG-Only, or Combined SR/GHG Report.
  • Tips from the Help Desk, including answers to common questions and how to handle unusual facility types and insignificant non-reportable uses.
  • What's New with the SR/GHG Forms, describing changes in the SR-Only, GHG-Only, or Combined SR/GHG reporting packages.

Additional Resources for How to File